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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Additional Paid-In Capital
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive (Loss) Income
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Dec. 31, 2019     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]                
Equity component on conversions 237,462     237,462        
Purchase of 2026 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        
Net proceeds from capped call related to conversions 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 share settlement of equity awards (in shares)     2,110,000          
Net share 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 income (loss) (32,264)           (32,264)  
Ending balance (in shares) at Sep. 30, 2020     128,654,000          
Beginning balance at Sep. 30, 2020 645,392   $ 129 1,092,574   1,333 (448,644)  
Beginning balance (in shares) at Dec. 31, 2019     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 Accounting Standards Update 2020-06              
Ending balance (in shares) at Dec. 31, 2020 129,343,524   129,344,000          
Beginning balance at Dec. 31, 2020 $ 609,635 (378,138) $ 129 1,030,577 $ (465,006) 1,530 (422,601) 86,868
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 on conversions 237,462     237,462        
Purchase of 2026 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        
Net proceeds from capped call related to conversions 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 share settlement of equity awards (in shares)     243,000          
Net share settlement of equity awards (11,120)     (11,120)        
Share-based compensation expense 21,529     21,529        
Other comprehensive income (loss) (517)         (517)    
Net income (loss) (37,140)           (37,140)  
Ending balance (in shares) at Sep. 30, 2020     128,654,000          
Beginning balance at Sep. 30, 2020 $ 645,392   $ 129 1,092,574   1,333 (448,644)  
Beginning balance (in shares) at Dec. 31, 2020 129,343,524   129,344,000          
Beginning balance at Dec. 31, 2020 $ 609,635 $ (378,138) $ 129 1,030,577 $ (465,006) 1,530 (422,601) $ 86,868
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock in connection with equity offering, net of offering costs (in shares)     10,975,000          
Issuance of common stock in connection with equity offering, net of offering costs 1,091,466   $ 11 1,091,455        
Equity component on conversions (236,920)     (236,920)        
Issuance of common stock upon conversion of 2023 convertible senior notes (in shares)     2,983,000          
Issuance of common stock upon conversion of 2023 convertible senior notes 235,521   $ 3 235,518        
Net proceeds from capped call related to conversions 67,769     67,769        
Issuance of common stock upon exercise of stock options and ESPP (in shares)     178,000          
Issuance of common stock upon exercise of stock options and ESPP 5,371     5,371        
Net share settlement of equity awards (in shares)     1,421,000          
Net share settlement of equity awards (89,337)   $ 2 (89,339)        
Share-based compensation expense 77,996     77,996        
Other comprehensive income (loss) (3,082)         (3,082)    
Net income (loss) $ (25,764)           (25,764)  
Ending balance (in shares) at Sep. 30, 2021 144,901,435   144,901,000          
Beginning balance at Sep. 30, 2021 $ 1,354,517   $ 145 1,717,421   (1,552) (361,497)  
Beginning balance (in shares) at Jun. 30, 2021     144,621,000          
Beginning balance at Jun. 30, 2021 1,337,882   $ 145 1,706,855   (970) (368,148)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock upon exercise of stock options and ESPP (in shares)     14,000          
Issuance of common stock upon exercise of stock options and ESPP 106     106        
Net share settlement of equity awards (in shares)     266,000          
Net share settlement of equity awards (14,697)     (14,697)        
Share-based compensation expense 25,157     25,157        
Other comprehensive income (loss) (582)         (582)    
Net income (loss) $ 6,651           6,651  
Ending balance (in shares) at Sep. 30, 2021 144,901,435   144,901,000          
Beginning balance at Sep. 30, 2021 $ 1,354,517   $ 145 $ 1,717,421   $ (1,552) $ (361,497)