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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]                
Accounting standards update us-gaap:AccountingStandardsUpdate201613Member              
Issuance of common stock upon exercise of stock options and ESPP (in shares)     672,000          
Issuance of common stock upon exercise of stock options and ESPP $ 8,037     8,037        
Net share settlement of equity awards (in shares)     1,867,000          
Net share settlement of equity awards (54,102)   $ 2 (54,104)        
Share-based compensation expense 37,880     37,880        
Other comprehensive income 2,946         2,946    
Net income 4,876           4,876  
Ending 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)  
Beginning balance (in shares) at Mar. 31, 2020     123,543,000          
Beginning balance at Mar. 31, 2020 462,927   $ 124 890,258   (5,362) (422,093)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock upon exercise of stock options and ESPP (in shares)     312,000          
Issuance of common stock upon exercise of stock options and ESPP 5,372     5,372        
Net share settlement of equity awards (in shares)     268,000          
Net share settlement of equity awards (7,268)     (7,268)        
Share-based compensation expense 19,546     19,546        
Other comprehensive income 7,212         7,212    
Net income 10,589           10,589  
Ending 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)  
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
Beginning balance (Accounting Standards Update 2020-06) at Dec. 31, 2020         $ (465,000)     $ 86,900
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock in connection with equity offering, net of offering costs 1,091,466   $ 11 1,091,455        
Issuance of common stock in connection with equity offering, net of offering costs (in shares)     10,975,000          
Equity component of convertible senior notes, net of issuance costs (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 conversions of 2023 notes 235,521   $ 3 235,518        
Net proceeds from capped call related to conversions of 2023 notes and 2025 notes 67,769     67,769        
Issuance of common stock upon exercise of stock options and ESPP (in shares)     164,000          
Issuance of common stock upon exercise of stock options and ESPP 5,265     5,265        
Net share settlement of equity awards (in shares)     1,155,000          
Net share settlement of equity awards (74,640)   $ 2 (74,642)        
Share-based compensation expense 52,839     52,839        
Other comprehensive income (2,500)         (2,500)    
Net income $ (32,415)           (32,415)  
Ending balance (in shares) at Jun. 30, 2021 144,621,425   144,621,000          
Beginning balance at Jun. 30, 2021 $ 1,337,882   $ 145 1,706,855   (970) (368,148)  
Beginning balance (in shares) at Mar. 31, 2021     141,317,000          
Beginning balance at Mar. 31, 2021 1,243,343   $ 141 1,645,352   (1,238) (400,912)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity component of convertible senior notes, net of issuance costs (225,615)     (225,615)        
Issuance of common stock upon conversion of 2023 convertible senior notes (in shares)     2,857,000          
Issuance of common stock upon conversions of 2023 notes 224,284   $ 3 224,281        
Net proceeds from capped call related to conversions of 2023 notes and 2025 notes 44,192     44,192        
Issuance of common stock upon exercise of stock options and ESPP (in shares)     120,000          
Issuance of common stock upon exercise of stock options and ESPP 4,919     4,919        
Net share settlement of equity awards (in shares)     327,000          
Net share settlement of equity awards (15,465)   $ 1 (15,466)        
Share-based compensation expense 29,192     29,192        
Other comprehensive income 268         268    
Net income $ 32,764           32,764  
Ending balance (in shares) at Jun. 30, 2021 144,621,425   144,621,000          
Beginning balance at Jun. 30, 2021 $ 1,337,882   $ 145 $ 1,706,855   $ (970) $ (368,148)