Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, Net (Details 2)

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Property and Equipment, Net (Details 2) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Property, Plant and Equipment [Line Items]        
Depreciation expense $ 122,000 $ 132,000 $ 249,000 $ 261,000
Research and development [Member]        
Property, Plant and Equipment [Line Items]        
Depreciation expense 98,000 103,000 198,000 203,000
General and administrative [Member]        
Property, Plant and Equipment [Line Items]        
Depreciation expense $ 24,000 $ 29,000 $ 51,000 $ 58,000