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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Beginning balance, shares at Dec. 31, 2014   49,322    
Beginning balance at Dec. 31, 2014 $ 41,753 $ 49 $ 170,286 $ (128,582)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock upon exercise of stock options and warrants, shares   992    
Issuance of common stock upon exercise of stock options and warrants 1,266 $ 1 1,265  
Issuance of common stock upon vesting of restricted stock units, shares   566    
Issuance of common stock upon vesting of restricted stock units 0 $ 1 (1)  
Issuance of common stock under ESPP, shares   306    
Issuance of common stock under ESPP 1,369   1,369  
Stock-based compensation 7,730   7,730  
Forfeiture of unvested restricted common stock, shares   (21)    
Forfeiture of unvested restricted common stock 0   0  
Net loss (25,838)     (25,838)
Ending balance at Dec. 31, 2015 26,280 $ 51 180,649 (154,420)
Ending balance, shares at Dec. 31, 2015   51,165    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock upon exercise of stock options and warrants, shares   982    
Issuance of common stock upon exercise of stock options and warrants 4,286 $ 1 4,285  
Issuance of common stock upon vesting of restricted stock units, shares   896    
Issuance of common stock upon vesting of restricted stock units 0 $ 1 (1)  
Issuance of common stock under ESPP, shares   320    
Issuance of common stock under ESPP 1,979   1,979  
Stock-based compensation 9,643   9,643  
Net loss (11,860)     (11,860)
Ending balance at Dec. 31, 2016 30,328 $ 53 196,555 (166,280)
Ending balance, shares at Dec. 31, 2016   53,363    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock upon exercise of stock options and warrants, shares   2,033    
Issuance of common stock upon exercise of stock options and warrants 6,035 $ 2 6,033  
Issuance of common stock upon vesting of restricted stock units, shares   971    
Issuance of common stock upon vesting of restricted stock units 0 $ 1 (1)  
Issuance of common stock under ESPP, shares   265    
Issuance of common stock under ESPP 4,101 $ 1 4,100  
Stock-based compensation 15,343   15,343  
Other [1] 0   172 (172)
Net loss (8,969)     (8,969)
Ending balance at Dec. 31, 2017 $ 46,838 $ 57 $ 222,202 $ (175,421)
Ending balance, shares at Dec. 31, 2017   56,632    
[1] Effective January 2017, the Company adopted Accounting Standards Update (“ASU”) 2016-09 - Improvements to Employee Share-Based Payment Accounting. Accordingly, the Company accounted for forfeitures as they occurred rather than by estimating expected forfeitures. This amount represents the net effect of this change. See Note 1 for more information.