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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning balance, shares at Dec. 31, 2016   91,709,000      
Beginning balance at Dec. 31, 2016 $ 221,939 $ 92 $ 593,351 $ (176) $ (371,328)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock in connection with follow-on offering, net of offering costs, shares   11,500,000      
Issuance of common stock in connection with follow-on offering, net of offering costs 147,609 $ 12 147,597 0 0
Issuance of common stock upon exercise of stock options and ESPP, shares   3,280,000      
Issuance of common stock upon exercise of stock options and ESPP 23,656 $ 3 23,653    
Net issuance of common stock for settlement of RSUs, shares   3,155,000      
Net share settlement of equity awards (20,112) $ 3 (20,115)    
Warrant exercises, shares   24,000      
Warrant exercises 0   0    
Share-based compensation expense 38,359   38,359    
Other comprehensive loss (106)     (106)  
Net loss (20,283)       (20,283)
Ending balance at Dec. 31, 2017 391,062 $ 110 782,845 (282) (391,611)
Ending balance, shares at Dec. 31, 2017   109,668,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Equity component of convertible senior notes, net of issuance costs 62,444   62,444    
Purchase of convertible senior notes capped call (39,227)   (39,227)    
Issuance of common stock upon exercise of stock options and ESPP, shares   3,459,000      
Issuance of common stock upon exercise of stock options and ESPP 29,113 $ 4 29,109    
Net issuance of common stock for settlement of RSUs, shares   3,322,000      
Net share settlement of equity awards (49,086) $ 3 (49,089)    
Warrant exercises, shares   34,000      
Warrant exercises 0   0    
Repurchase of common stock, shares   (983,000)      
Repurchase of common stock (20,000) $ (1) (19,999)    
Share-based compensation expense 52,030   52,030    
Other comprehensive loss (737)     (737)  
Net loss (14,888)       (14,888)
Ending balance at Dec. 31, 2018 $ 410,634 $ 116 818,113 (1,019) (406,576)
Ending balance, shares at Dec. 31, 2018 115,500,418 115,500,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Equity component of convertible senior notes, net of issuance costs $ 206,747   206,747    
Purchase of convertible senior notes capped call (97,200)   (97,200)    
Issuance of common stock upon exercise of stock options and ESPP, shares   3,276,000      
Issuance of common stock upon exercise of stock options and ESPP 35,097 $ 4 35,093    
Net issuance of common stock for settlement of RSUs, shares   3,248,000      
Net share settlement of equity awards (94,568) $ 3 (94,571)    
Issuance of common stock in connection with prior acquisition, shares   64,000      
Issuance of common stock in connection with prior acquisition 3,003   3,003    
Repurchase of common stock, shares   (504,000)      
Repurchase of common stock (20,000) $ (1) (19,999)    
Share-based compensation expense 64,909   64,909    
Other comprehensive loss (77)     (77)  
Net loss (9,605)       (9,605)
Ending balance at Dec. 31, 2019 $ 498,829 $ 122 $ 916,095 $ (1,096) $ (416,292)
Ending balance, shares at Dec. 31, 2019 121,583,501 121,584,000