v3.3.1.900
Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Balance at Dec. 31, 2012 $ 91,555 $ 31 $ 166,651 $ 8 $ (75,135)
Balance (in shares) at Dec. 31, 2012   31,420,028      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 1,541       1,541
Change in net unrealized gain (loss) on investments 30     30  
Issuance of common stock upon exercise of stock options $ 4,073 $ 1 4,072    
Issuance of common stock upon exercise of stock options (shares) 952,871 952,871      
Vesting of early exercised common stock options $ 262   262    
Excess tax benefits from stock-based compensation 150   150    
Repurchase of unvested early exercised stock options 0        
Repurchase of unvested early exercised stock options (shares)   (500)      
Issuance of common stock in exchange for services 41   41    
Issuance of common stock in exchange for services (shares)   2,900      
Stock-based compensation 5,465   5,465    
Balance at Dec. 31, 2013 103,117 $ 32 176,641 38 (73,594)
Balance (in shares) at Dec. 31, 2013   32,375,299      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 30,244       30,244
Change in net unrealized gain (loss) on investments (28)     (28)  
Issuance of common stock upon exercise of stock options $ 7,639 $ 2 7,637    
Issuance of common stock upon exercise of stock options (shares) 1,216,710 1,216,710      
Vesting of early exercised common stock options $ 47   47    
Excess tax benefits from stock-based compensation 259   259    
Repurchase of unvested early exercised stock options 0        
Repurchase of unvested early exercised stock options (shares)   (125)      
Issuance of common stock in exchange for services 50   50    
Issuance of common stock in exchange for services (shares)   2,401      
Stock-based compensation 10,499   10,499    
Balance at Dec. 31, 2014 151,827 $ 34 195,133 10 (43,350)
Balance (in shares) at Dec. 31, 2014   33,594,285      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 15,865       15,865
Change in net unrealized gain (loss) on investments (221)     (221)  
Issuance of common stock upon exercise of stock options 10,095 $ 0 10,095    
Issuance of common stock upon vesting of restricted stock units $ 0        
Issuance of common stock upon vesting of restricted stock units (in shares)   12,500      
Issuance of common stock upon exercise of stock options (shares) 807,846 807,846      
Vesting of early exercised common stock options $ 19   19    
Excess tax benefits from stock-based compensation 487   487    
Stock-based compensation 17,494   17,494    
Balance at Dec. 31, 2015 $ 195,566 $ 34 $ 223,228 $ (211) $ (27,485)
Balance (in shares) at Dec. 31, 2015   34,414,631