Annual report pursuant to Section 13 and 15(d)

Stock Options and Warrants (Details Textual)

v3.8.0.1
Stock Options and Warrants (Details Textual) - USD ($)
1 Months Ended 9 Months Ended 11 Months Ended 12 Months Ended
Dec. 01, 2016
Nov. 23, 2016
Nov. 01, 2016
Sep. 01, 2016
Aug. 24, 2016
Apr. 11, 2016
Dec. 31, 2015
Dec. 30, 2015
Nov. 02, 2015
May 07, 2015
Apr. 23, 2015
Dec. 15, 2014
Dec. 01, 2014
Apr. 30, 2017
Jan. 29, 2017
Dec. 31, 2016
Mar. 31, 2016
Feb. 02, 2016
Nov. 26, 2014
Sep. 22, 2014
Sep. 30, 2015
Dec. 02, 2016
Dec. 31, 2017
Dec. 31, 2016
Mar. 26, 2018
Jan. 25, 2018
Aug. 22, 2016
Jul. 15, 2015
Jul. 01, 2013
Equity Stock Options and Warrants (Textual)                                                          
Common stock, shares authorized                               200,000,000             200,000,000 200,000,000          
Description of granted options vesting right                                             The remaining weighted-average vesting periods of 1.9 years for outstanding grants was $1.1 million.            
Stock-based compensation                                             $ 883,000 $ 1,327,000          
Warrants issued                         8,462         50,000                      
Options granted contract term                                             7 years 4 months 17 days 5 years 7 days          
Options vesting percentage                                             33.00%            
Proceeds from issuance of private placement           $ 3,000,000                                              
Warrant amendment - August 24, 2016                                                        
Reclassification of warrants previously recorded as derivative liabilities to paid in capital                                                        
Debt discount recorded for amendments of warrants                                             $ 236,000          
Options outsatnding                               273,550             668,607 273,550          
Options exercisable, number of shares                                             404,287            
Aggregate of common stock shares           696,056                                              
Outstanding warrants exercisable                                             6,084,603            
Weighted average exercise price                                             $ 8.30            
Restricted common stock issued                                             210,000            
Number of warrants issued                                             6,084,603            
Exercise price of warrants                                             $ 3.38            
Fair value granted                                             0.98            
Junior Notes Warrants [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Warrants issued                               187,500                          
Exercise price per share $ 3.00   $ 3.00 $ 4.00                     $ 3.00                 $ 3.00          
Reduction in warrants exercise price                                           $ 3.00              
Reclassification of warrants previously recorded as derivative liabilities to paid in capital                                               $ 30,000          
Warrant term                               5 years                          
Subsequent Event [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Exercise price of warrants                                                 $ 1.50 $ 1.50      
Stock Option [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Description of granted options vesting right                                               The options granted have a contract term ranging between three and ten years. Options granted typically vest over a four year period, with 25% vesting after one year and the remainder ratably over the remaining three years.          
Options vesting period                                               4 years          
Options vesting percentage                                               25.00%          
Fair value of option, exercise price                                             $ 2.50            
Fair value of option, risk free interest rate                                             1.88%            
Fair value of option, expected life                                             5 years            
Fair value of option, expected volatility                                             92.00%            
Stock based compensation expense                                             $ 174,000            
Vesting of restricted stock grant                                             $ 709,000            
2014 Services Warrants - April [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Exercise price per share                                               $ 11.50          
Outstanding warrants exercisable [1]                                             13,657            
Number of warrants issued [1]                                             13,657            
Exercise price of warrants [1]                                             $ 39.00            
2014 Convertible Notes Warrants [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Outstanding warrants exercisable [2]                                             16,000            
Number of warrants issued [2]                                             16,000            
Exercise price of warrants [2]                                             $ 25.00            
2014 Services Warrants - September [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Exercise price per share                                               $ 39          
Outstanding warrants exercisable [3]                                             26,500            
Number of warrants issued [3]                                             26,500            
Exercise price of warrants [3]                                             $ 25.00            
Backstop Security Warrants [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Warrants outstanding                                             $ 26,000            
Outstanding warrants exercisable                                             41,000            
Number of warrants issued                                             41,000            
Exercise price of warrants                                             $ 3.00            
2017 Senior Notes Warrants [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Warrants outstanding                                             $ 305,000            
Outstanding warrants exercisable                                             622,222            
Number of warrants issued                                             622,222            
Exercise price of warrants                                             $ 1.50            
2013 Equity Incentive Plan [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Maximum number of common shares authorized to purchase                                                         420,000
Options outsatnding                               224,314               224,314          
Options exercisable, number of shares                               202,541               202,541          
2015 Equity Incentive Award Plan [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Maximum number of common shares authorized to purchase                                             85,857       600,000    
Common stock, shares authorized                                                       300,000  
Term of stock option and stock appreciation right                                               The maximum term of each stock option and stock appreciation right (SAR) is 10 years.          
Options outsatnding                               6,000             444,293 6,000          
Options exercisable, number of shares                                             201,746            
Aggregate of common stock shares                                             446,000            
Minimum [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Options granted contract term                                               3 years          
Maximum [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Options granted contract term                                               10 years          
Warrants [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Warrants issued                   5,514                                      
Exercise price per share     4.00             $ 12.50                       3.00              
Warrants valued using the black-scholes option pricing model                   $ 56,000                                      
Reduction in warrants exercise price     $ 3.00                     $ 3.00               $ 3.00              
Exercise price of warrants             $ 12.04                 $ 3.77             $ 3.38 $ 3.77          
Fair value of option, expected life                                             5 years            
Dividend rate                                             0.00%            
Warrants [Member] | Minimum [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Exercise price per share         $ 4.00                                                
Reduction in warrants exercise price         4.00                                                
Fair value of option, risk free interest rate                                             1.84%            
Fair value of option, expected volatility                                             68.00%            
Warrants [Member] | Maximum [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Exercise price per share         12.50                                                
Reduction in warrants exercise price         5.00                                                
Fair value of option, risk free interest rate                                             2.24%            
Fair value of option, expected volatility                                             92.00%            
Warrant 1 [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Weighted average remaining life of warrants                                             3 years 9 months 11 days            
Warrants issued 62,500   62,500 124,999     312,500 50,000 74,000 83,518 136,267 19,232 19,232     62,500 500,000   6,500         62,500          
Warrant issued value                                     $ 43,000 $ 296,000                  
Exercise price per share       $ 4.00 $ 4.00   $ 5.00 $ 12.50 $ 15.00 $ 12.50 $ 12.50 $ 25.00 $ 39.00       $ 5.00 $ 12.50 $ 25.00 $ 25.00                  
Warrants valued using the black-scholes option pricing model       $ 271,000         $ 246,000 $ 2,139,000 $ 2,139,000   $ 246,000       $ 1,497,000 $ 148,000         $ 73,000            
Reduction in warrants exercise price   $ 3                             $ 5.00                        
Warrants outstanding                                 $ 100                        
Weighted average exercise price                                             $ 3.38            
Convertible Unsecured Notes Warrant [Member] | 2014 Services Warrants - September [Member]                                                          
Equity Stock Options and Warrants (Textual)                                                          
Stock-based compensation                                       $ 6,000                  
Warrant issued value                                       $ 131,000                  
Exercise price per share                                       $ 25.00                  
[1] The 2014 Services Warrants April were issued for fees incurred in conjunction with the issuance of convertible notes in 2014. The warrants were valued on the issuance date at $11.50 per share in conjunction with the valuation approach used for the initial valuation of the warrants issued in connection with the convertible notes issued in 2014.
[2] The 2014 Services Warrants September were issued to a consultant in exchange for advisory services with no readily available fair value. The warrants were originally issued at an exercise price of $39.00 per share and had a one-time price reset provision to the exercise price of the warrants issued to investors in the convertible notes offering in April 2014 if the exercise price of such convertible notes warrants changed prior to September 30, 2014. On September 22, 2014, the exercise price was changed to $25.00 per share. There are no further exercise price changes for this warrant series. The warrants were valued using the Black-Scholes option pricing model at $131,000 on the issuance date with an additional $6,000 recorded to expense on September 22, 2014 to reflect the change in fair value resulting from the exercise price change.
[3] On September 22, 2014, the Company issued warrants to purchase up to 26,500 shares of common stock with an exercise price of $25.00 per share in conjunction with placement agent services for the Company's September 2014 private equity placement. The warrants were valued using the Black-Scholes option pricing model at $296,000 on the issuance date.