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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Convertible debt
Convertible Senior Notes Due 2022 [Member]
Common Stock
Additional Paid-In Capital
Additional Paid-In Capital
Convertible debt
Additional Paid-In Capital
Convertible Senior Notes Due 2022 [Member]
Accumulated Deficit
Accumulated Other Comprehensive Income
Balances at Dec. 31, 2015 $ 218,392     $ 37 $ 526,696     $ (308,289) $ (52)
Balances (in shares) at Dec. 31, 2015       36,848,000          
Increase (Decrease) in Stockholders' Equity                  
Exercise of stock options 5,770       5,770        
Exercise of stock options (in shares)       518,000          
Vested restricted stock units 0                
Vested restricted stock units (in shares)       62,000          
Shares issued under employee stock purchase plan 1,495       1,495        
Shares issued under employee stock purchase plan (in shares)       53,000          
Stock-based compensation 31,248       31,248        
Equity component of convertible senior notes, net of issuance costs (2)       (2)        
Net unrealized gain (loss) on investments 22               22
Net loss (37,949)             (37,949)  
Balances at Dec. 31, 2016 218,976     $ 37 565,207     (346,238) (30)
Balances (in shares) at Dec. 31, 2016       37,481,000          
Increase (Decrease) in Stockholders' Equity                  
Net loss (19,866)                
Balances at Dec. 31, 2016 218,976     $ 37 565,207     (346,238) (30)
Balances (in shares) at Dec. 31, 2016       37,481,000          
Increase (Decrease) in Stockholders' Equity                  
Exercise of stock options 6,778     $ 1 6,777        
Exercise of stock options (in shares)       540,000          
Vested restricted stock units 0                
Vested restricted stock units (in shares)       101,000          
Shares issued under employee stock purchase plan 1,862       1,862        
Shares issued under employee stock purchase plan (in shares)       57,000          
Stock-based compensation 31,601       31,601        
Issuance of common stock upon conversion of 2019 convertible senior notes 120,960     $ 3 120,957        
Issuance of common stock upon conversion of 2019 convertible senior notes (in shares)       2,490,000          
Equity component of convertible senior notes, net of issuance costs   $ (126,328) $ 68,669     $ (126,328) $ 68,669    
Net unrealized gain (loss) on investments (424)               (424)
Net loss (42,611)             (42,611)  
Balances at Dec. 31, 2017 279,483     $ 41 669,032     (389,136) (454)
Balances (in shares) at Dec. 31, 2017       40,669,000          
Increase (Decrease) in Stockholders' Equity                  
Cumulative effect adjustment of the adoption of Accounting Standards Update 2016-09 (Note 3)         287     (287)  
Net loss (10,680)                
Balances at Dec. 31, 2017 279,483     $ 41 669,032     (389,136) (454)
Balances (in shares) at Dec. 31, 2017       40,669,000          
Increase (Decrease) in Stockholders' Equity                  
Exercise of stock options 7,170     $ 0 7,170        
Exercise of stock options (in shares)       333,000          
Vested restricted stock units 0     $ 0          
Vested restricted stock units (in shares)       156,000          
Shares issued under employee stock purchase plan $ 1,784       1,784        
Shares issued under employee stock purchase plan (in shares) 224,887     65,000          
Stock-based compensation $ 31,725       31,725        
Net unrealized gain (loss) on investments 174               174
Net loss (471)             (471)  
Balances at Dec. 31, 2018 321,226     $ 41 709,691     (388,226) $ (280)
Balances (in shares) at Dec. 31, 2018       41,223,000          
Increase (Decrease) in Stockholders' Equity                  
Cumulative effect adjustment of the adoption of Accounting Standards Update 2016-09 (Note 3) 1,361             1,361  
Net loss $ 2,564                
Cumulative effect adjustment of the adoption of Accounting Standards Update 2016-09 (Note 3)         $ (20)     $ 20