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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Common stock, beginning balance (in shares) at Dec. 31, 2018   115,500,000      
Beginning balance at Dec. 31, 2018 $ 410,634 $ 116 $ 818,113 $ (1,019) $ (406,576)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Equity component of convertible senior notes, net of issuance costs 180,887   180,887    
Purchase of convertible senior notes capped call (85,050)   (85,050)    
Repurchase of common stock (in shares)   (504,000)      
Repurchase of common stock (20,000) $ (1) (19,999)    
Issuance of common stock upon exercise of stock options and ESPP (in shares)   709,000      
Issuance of common stock upon exercise of stock options and ESPP 5,820 $ 1 5,819    
Net issuance of common stock for settlement of RSUs (in shares)   2,451,000      
Net issuance of common stock for settlement of RSUs (76,042) $ 2 (76,044)    
Issuance of common stock in connection with prior acquisition (in shares)   41,000      
Issuance of common stock in connection with prior acquisition 1,160   1,160    
Share-based compensation expense 15,038   15,038    
Other comprehensive income (loss) 119     119  
Net loss (4,318)       (4,318)
Common stock, ending balance (in shares) at Mar. 31, 2019   118,197,000      
Beginning balance at Mar. 31, 2019 $ 428,137 $ 118 839,924 (900) (411,005)
Common stock, beginning balance (in shares) at Dec. 31, 2019 121,583,501 121,584,000      
Beginning balance at Dec. 31, 2019 $ 498,829 $ 122 916,095 (1,096) (416,292)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock upon exercise of stock options and ESPP (in shares)   360,000      
Issuance of common stock upon exercise of stock options and ESPP 2,665   2,665    
Net issuance of common stock for settlement of RSUs (in shares)   1,599,000      
Net issuance of common stock for settlement of RSUs (46,834) $ 2 (46,836)    
Share-based compensation expense 18,334   18,334    
Other comprehensive income (loss) (4,266)     (4,266)  
Net loss $ (5,713)       (5,713)
Common stock, ending balance (in shares) at Mar. 31, 2020 123,542,833 123,543,000      
Beginning balance at Mar. 31, 2020 $ 462,927 $ 124 $ 890,258 $ (5,362) $ (422,093)