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Effects of Adopting ASC Topic 606, Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (7,605) $ (3,894)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 6 9
Stock-based compensation 887 833
Changes in assets and liabilities:    
Accounts receivables (6) 0
Prepaid expenses and other current assets (279) (185)
Prepaid expense - Non-current 82 0
Accounts payable 3,331 (1,155)
Related party payable 258 0
Accrued payroll and related expenses (1,970) (1,372)
Income tax liability 5 5
Deferred revenue 2 (375)
Net cash used in operating activities (5,289) (6,134)
Cash flows from investing activities:    
Purchase of investments (282) 0
Proceeds from sale or maturity of investments 1,154 3,116
Net cash provided by investing activities 872 3,116
Cash flows from financing activities:    
Proceeds from sale of common stock 6,830 0
Payments of taxes on restricted stock units (4) 0
Net cash provided by financing activities 6,826 0
Net increase (decrease) in cash and cash equivalents 2,409 (3,018)
Cash and cash equivalents, beginning of period 3,135 6,627
Cash and cash equivalents, end of period 5,544 $ 3,609
Pre-606 [Member]    
Cash flows from operating activities:    
Net loss (7,230)  
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 6  
Stock-based compensation 887  
Changes in assets and liabilities:    
Accounts receivables (6)  
Prepaid expenses and other current assets (279)  
Prepaid expense - Non-current 82  
Accounts payable 3,331  
Related party payable 258  
Accrued payroll and related expenses (1,970)  
Income tax liability 5  
Deferred revenue (373)  
Net cash used in operating activities (5,289)  
Cash flows from investing activities:    
Purchase of investments (282)  
Proceeds from sale or maturity of investments 1,154  
Net cash provided by investing activities 872  
Cash flows from financing activities:    
Proceeds from sale of common stock 6,830  
Payments of taxes on restricted stock units (4)  
Net cash provided by financing activities 6,826  
Net increase (decrease) in cash and cash equivalents 2,409  
Cash and cash equivalents, beginning of period 3,135  
Cash and cash equivalents, end of period 5,544  
Effects of ASC Topic 606 [Member] | ASC Topic 606 [Member]    
Cash flows from operating activities:    
Net loss (375)  
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 0  
Stock-based compensation 0  
Changes in assets and liabilities:    
Accounts receivables 0  
Prepaid expenses and other current assets 0  
Prepaid expense - Non-current 0  
Accounts payable 0  
Related party payable 0  
Accrued payroll and related expenses 0  
Income tax liability 0  
Deferred revenue 375  
Net cash used in operating activities 0  
Cash flows from investing activities:    
Purchase of investments 0  
Proceeds from sale or maturity of investments 0  
Net cash provided by investing activities 0  
Cash flows from financing activities:    
Proceeds from sale of common stock 0  
Payments of taxes on restricted stock units 0  
Net cash provided by financing activities 0  
Net increase (decrease) in cash and cash equivalents 0  
Cash and cash equivalents, beginning of period 0  
Cash and cash equivalents, end of period $ 0