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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Line Items]        
Depreciation expense $ 80,000 $ 131,000 $ 240,000 $ 338,000
Research and development [Member]        
Property, Plant and Equipment [Line Items]        
Depreciation expense 77,000 102,000 231,000 282,000
General and administrative [Member]        
Property, Plant and Equipment [Line Items]        
Depreciation expense $ 3,000 $ 29,000 $ 9,000 $ 56,000