Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Detail (Details)

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Balance Sheet Detail (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Equipment and leasehold improvements      
Equipment and leasehold improvements, Gross $ 3,326   $ 3,323
Less accumulated depreciation and amortization (1,568)   (1,495)
Equipment and leasehold improvements, Net 1,758   1,828
Depreciation and amortization expense 114 $ 114  
Equipment      
Equipment and leasehold improvements      
Equipment and leasehold improvements, Gross 1,993   1,988
Leasehold improvements      
Equipment and leasehold improvements      
Equipment and leasehold improvements, Gross 1,333   $ 1,335
General and Administrative Expense      
Equipment and leasehold improvements      
Depreciation and amortization expense $ 100 $ 100