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Effects of Adopting ASC Topic 606, Balance Sheets (Details) - USD ($)
$ / shares in Units, $ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Current assets:        
Cash and cash equivalents $ 5,544 $ 3,135 $ 3,609 $ 6,627
Investments available for sale 583 1,453    
Prepaid expenses and other current assets 870 591    
Accounts receivables 6 0    
Total current assets 7,003 5,179    
Prepaid expenses, non-current 1,907 1,989    
Property and equipment, net 1 7    
Total assets 8,911 7,175    
Current liabilities:        
Accounts payable and accrued liabilities 3,745 414    
Accounts payable related party 258 0    
Accrued payroll and related expenses 201 2,175    
Income tax liability 398 393    
Deferred revenue, current portion 2 1,500    
Total current liabilities 4,604 4,482    
Deferred revenue, non-current portion 0 1,000    
Other liabilities 140 140    
Total liabilities 4,744 5,622    
Commitments and contingencies (Note 5)    
Stockholders' equity:        
Preferred stock, par value $0.0001 per share Authorized: 10,000,000 shares at March 31, 2018 and December 31, 2017, Issued and outstanding: 0 shares at March 31, 2018 and December 31, 2017 0 0    
Common stock, par value $0.0001 per share: Authorized: 100,000,000 shares at March 31, 2018 and December 31, 2017, Issued and outstanding: 60,823,667 shares and 59,051,978 shares, at March 31, 2018 and December 31, 2017, respectively 6 6    
Additional paid-in capital 184,793 177,076    
Accumulated deficit (180,620) (175,516)    
Accumulated other comprehensive loss (12) (13)    
Total stockholders' equity 4,167 1,553    
Total liabilities and stockholders' equity $ 8,911 $ 7,175    
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001    
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000    
Preferred stock, shares issued (in shares) 0 0    
Preferred stock, shares outstanding (in shares) 0 0    
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001    
Common stock, shares authorized (in shares) 100,000,000 100,000,000    
Common stock, shares issued (in shares) 60,823,667 59,051,978    
Common stock, shares outstanding (in shares) 60,823,667 59,051,978    
Pre-606 [Member]        
Current assets:        
Cash and cash equivalents $ 5,544 $ 3,135    
Investments available for sale 583      
Prepaid expenses and other current assets 870      
Accounts receivables 6      
Total current assets 7,003      
Prepaid expenses, non-current 1,907      
Property and equipment, net 1      
Total assets 8,911      
Current liabilities:        
Accounts payable and accrued liabilities 3,745      
Accounts payable related party 258      
Accrued payroll and related expenses 201      
Income tax liability 398      
Deferred revenue, current portion 1,502      
Total current liabilities 6,104      
Deferred revenue, non-current portion 625      
Other liabilities 140      
Total liabilities 6,869      
Commitments and contingencies (Note 5)      
Stockholders' equity:        
Preferred stock, par value $0.0001 per share Authorized: 10,000,000 shares at March 31, 2018 and December 31, 2017, Issued and outstanding: 0 shares at March 31, 2018 and December 31, 2017 0      
Common stock, par value $0.0001 per share: Authorized: 100,000,000 shares at March 31, 2018 and December 31, 2017, Issued and outstanding: 60,823,667 shares and 59,051,978 shares, at March 31, 2018 and December 31, 2017, respectively 6      
Additional paid-in capital 184,793      
Accumulated deficit (182,745)      
Accumulated other comprehensive loss (12)      
Total stockholders' equity 2,042      
Total liabilities and stockholders' equity 8,911      
Effects of ASC Topic 606 [Member] | ASC Topic 606 [Member]        
Current assets:        
Cash and cash equivalents 0 $ 0    
Investments available for sale 0      
Prepaid expenses and other current assets 0      
Accounts receivables 0      
Total current assets 0      
Prepaid expenses, non-current 0      
Property and equipment, net 0      
Total assets 0      
Current liabilities:        
Accounts payable and accrued liabilities 0      
Accounts payable related party 0      
Accrued payroll and related expenses 0      
Income tax liability 0      
Deferred revenue, current portion (1,500)      
Total current liabilities (1,500)      
Deferred revenue, non-current portion (625)      
Other liabilities 0      
Total liabilities (2,125)      
Commitments and contingencies (Note 5)      
Stockholders' equity:        
Preferred stock, par value $0.0001 per share Authorized: 10,000,000 shares at March 31, 2018 and December 31, 2017, Issued and outstanding: 0 shares at March 31, 2018 and December 31, 2017 0      
Common stock, par value $0.0001 per share: Authorized: 100,000,000 shares at March 31, 2018 and December 31, 2017, Issued and outstanding: 60,823,667 shares and 59,051,978 shares, at March 31, 2018 and December 31, 2017, respectively 0      
Additional paid-in capital 0      
Accumulated deficit 2,125      
Accumulated other comprehensive loss 0      
Total stockholders' equity 2,125      
Total liabilities and stockholders' equity $ 0