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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)     360,000          
Issuance of common stock upon exercise of stock options and ESPP $ 2,665   $ 0 2,665        
Net share settlement of equity awards (in shares)     1,599,000          
Net share settlement of equity awards (46,834)   $ 2 (46,836)        
Share-based compensation expense 18,334     18,334        
Other comprehensive loss (4,266)         (4,266)    
Net loss (5,713)           (5,713)  
Ending 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)  
Beginning balance (in shares) at Dec. 31, 2020 129,343,524   129,344,000          
Beginning balance at Dec. 31, 2020 $ 609,635   $ 129 1,030,577   1,530 (422,601)  
Beginning balance (Accounting Standards Update 2020-06) at Dec. 31, 2020   $ (378,138)     $ (465,006)     $ (86,868)
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 (11,305)     (11,305)        
Issuance of common stock upon conversion of 2023 convertible senior notes (in shares)     126,000          
Issuance of common stock upon conversions of 2023 notes 11,237   $ 0 11,237        
Net proceeds from capped call related to conversions and extinguishments of 2023 notes and 2025 notes 23,577     23,577        
Issuance of common stock upon exercise of stock options and ESPP (in shares)     44,000          
Issuance of common stock upon exercise of stock options and ESPP 346   $ 0 346        
Net share settlement of equity awards (in shares)     828,000          
Net share settlement of equity awards (59,175)   $ 1 (59,176)        
Share-based compensation expense 23,647     23,647        
Other comprehensive loss (2,768)         (2,768)    
Net loss $ (65,179)           (65,179)  
Ending balance (in shares) at Mar. 31, 2021 141,317,066   141,317,000          
Beginning balance at Mar. 31, 2021 $ 1,243,343   $ 141 $ 1,645,352   $ (1,238) $ (400,912)