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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Common stock, beginning balance (in shares) at Dec. 31, 2018     115,500,000        
Beginning balance at Dec. 31, 2018 $ 410,634 $ (111) $ 116 $ 818,113 $ (1,019) $ (406,576) $ (111)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member            
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)      
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)     2,545,000        
Issuance of common stock upon exercise of stock options and ESPP 27,720   $ 3 27,717      
Net issuance of common stock for settlement of RSUs (in shares)     3,064,000        
Net issuance of common stock for settlement of equity awards (91,073)   $ 3 (91,076)      
Issuance of common stock in connection with prior acquisition (in shares)     64,000        
Issuance of common stock in connection with prior acquisition 3,003     3,003      
Share-based compensation expense 47,355     47,355      
Other comprehensive income (loss) (739)       (739)    
Net loss (17,824)         (17,824)  
Common stock, ending balance (in shares) at Sep. 30, 2019     120,669,000        
Beginning balance at Sep. 30, 2019 468,512   $ 121 894,660 (1,758) (424,511)  
Common stock, beginning balance (in shares) at Jun. 30, 2019     119,336,000        
Beginning balance at Jun. 30, 2019 459,571   $ 119 873,104 (618) (413,034)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock upon exercise of stock options and ESPP (in shares)     991,000        
Issuance of common stock upon exercise of stock options and ESPP 11,674   $ 1 11,673      
Net issuance of common stock for settlement of RSUs (in shares)     319,000        
Net issuance of common stock for settlement of equity awards (8,824)   $ 1 (8,825)      
Issuance of common stock in connection with prior acquisition (in shares)     23,000        
Issuance of common stock in connection with prior acquisition 1,843     1,843      
Share-based compensation expense 16,865     16,865      
Other comprehensive income (loss) (1,140)       (1,140)    
Net loss (11,477)         (11,477)  
Common stock, ending balance (in shares) at Sep. 30, 2019     120,669,000        
Beginning balance at Sep. 30, 2019 $ 468,512   $ 121 894,660 (1,758) (424,511)  
Common stock, beginning balance (in shares) at Dec. 31, 2019 121,583,501   121,584,000        
Beginning balance at Dec. 31, 2019 $ 498,829 $ (88) $ 122 916,095 (1,096) (416,292) $ (88)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member            
Equity component of convertible senior notes, net of issuance costs $ 237,462     237,462      
Purchase of convertible senior notes capped call (103,400)     (103,400)      
Equity component related to conversions of 2023 convertible senior notes (345,552)     (345,552)      
Issuance of common stock upon conversion of 2023 convertible senior notes (in shares)     4,182,000        
Issuance of common stock upon conversion of 2023 convertible senior notes 327,141   $ 4 327,137      
Proceeds from capped call related to conversions of 2023 convertible senior notes 57,414     57,414      
Issuance of common stock upon exercise of stock options and ESPP (in shares)     778,000        
Issuance of common stock upon exercise of stock options and ESPP 9,234   $ 1 9,233      
Net issuance of common stock for settlement of RSUs (in shares)     2,110,000        
Net issuance of common stock for settlement of equity awards (65,222)   $ 2 (65,224)      
Share-based compensation expense 59,409     59,409      
Other comprehensive income (loss) 2,429       2,429    
Net loss $ (32,264)         (32,264)  
Common stock, ending balance (in shares) at Sep. 30, 2020 128,654,401   128,654,000        
Beginning balance at Sep. 30, 2020 $ 645,392   $ 129 1,092,574 1,333 (448,644)  
Common stock, beginning balance (in shares) at Jun. 30, 2020     124,123,000        
Beginning balance at Jun. 30, 2020 498,378   $ 124 907,908 1,850 (411,504)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Equity component of convertible senior notes, net of issuance costs 237,462     237,462      
Purchase of convertible senior notes capped call (103,400)     (103,400)      
Equity component related to conversions of 2023 convertible senior notes (345,552)     (345,552)      
Issuance of common stock upon conversion of 2023 convertible senior notes (in shares)     4,182,000        
Issuance of common stock upon conversion of 2023 convertible senior notes 327,141   $ 4 327,137      
Proceeds from capped call related to conversions of 2023 convertible senior notes 57,414     57,414      
Issuance of common stock upon exercise of stock options and ESPP (in shares)     106,000        
Issuance of common stock upon exercise of stock options and ESPP 1,197   $ 1 1,196      
Net issuance of common stock for settlement of RSUs (in shares)     243,000        
Net issuance of common stock for settlement of equity awards (11,120)   $ 0 (11,120)      
Share-based compensation expense 21,529     21,529      
Other comprehensive income (loss) (517)       (517)    
Net loss $ (37,140)         (37,140)  
Common stock, ending balance (in shares) at Sep. 30, 2020 128,654,401   128,654,000        
Beginning balance at Sep. 30, 2020 $ 645,392   $ 129 $ 1,092,574 $ 1,333 $ (448,644)