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Loan Payable to Silicon Valley Bank (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 21, 2017
Dec. 31, 2017
Mar. 23, 2017
Future Cash Payments of Loan Payable [Abstract]      
2018   $ 876  
2019   835  
2020   386  
Total payments of principal and interest   2,097  
Less: amounts representing interest   (114)  
Total payments of principal before deferred financing costs   1,983  
Less: deferred financing costs   (113)  
Total loan payable, net of deferred financing costs   1,870  
Bank Warrant [Member]      
Bank Warrants [Abstract]      
Warrants issued (in shares) 8,247   7,321
Warrant exercise price (in dollars per share) $ 4.85   $ 5.46
Deferred financing costs   62  
Aggregate deferred financing costs   $ 196  
Loan and Security Agreement [Member]      
Loan and Security Agreement [Abstract]      
Amount borrowed     $ 2,000
Periodic payment term Monthly    
Periodic payments of principal and interest $ 67    
Base rate 4.25%    
Prime rate plus variable spread per annum   5.25%  
Additional final payment fee percentage 5.80%    
Amortization of deferred financing costs   $ 116  
Prepayment fee if prepaid more than one year but less than two years 2.00%    
Prepayment fee if prepaid two years or more 1.00%    
Interest rate on obligations due to bank 5.00%    
Loan and Security Agreement [Member] | Minimum [Member]      
Loan and Security Agreement [Abstract]      
Minimum legal judgments or legal actions amount triggering loan default $ 50    
Loan and Security Agreement [Member] | Prime Rate [Member]      
Loan and Security Agreement [Abstract]      
Basis spread variable rate 0.75%