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Debt - Adoption of ASU (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]          
Convertible senior notes, net $ 855,709   $ 378,586    
Total liabilities 1,303,918   841,586    
Additional paid-in-capital 542,415   692,603    
Accumulated deficit (619,539)   (617,279)    
Total stockholders' equity (81,225)   71,536 $ 76,300 $ 83,168
Total liabilities and stockholders' equity $ 1,222,693   913,122    
Cumulative Effect, Period of Adoption, Adjustment          
Debt Instrument [Line Items]          
Total stockholders' equity     $ (71,441)    
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06          
Debt Instrument [Line Items]          
Convertible senior notes, net   $ 71,441      
Total liabilities   71,441      
Additional paid-in-capital   (99,026)      
Accumulated deficit   27,585      
Total stockholders' equity   (71,441)      
Total liabilities and stockholders' equity   0      
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06, Transfer Equity Component of the Debt to Liabilities          
Debt Instrument [Line Items]          
Convertible senior notes, net   102,166      
Total liabilities   102,166      
Additional paid-in-capital   (102,166)      
Accumulated deficit   0      
Total stockholders' equity   (102,166)      
Total liabilities and stockholders' equity   0      
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06, Equity Component of Debt Issuance Costs          
Debt Instrument [Line Items]          
Convertible senior notes, net   (3,140)      
Total liabilities   (3,140)      
Additional paid-in-capital   3,140      
Accumulated deficit   0      
Total stockholders' equity   3,140      
Total liabilities and stockholders' equity   0      
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06, Reverse Debt Discount Amortization          
Debt Instrument [Line Items]          
Convertible senior notes, net   (28,811)      
Total liabilities   (28,811)      
Additional paid-in-capital   0      
Accumulated deficit   28,811      
Total stockholders' equity   28,811      
Total liabilities and stockholders' equity   0      
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06, Record Debt Issuance Costs Amortization          
Debt Instrument [Line Items]          
Convertible senior notes, net   1,226      
Total liabilities   1,226      
Additional paid-in-capital   0      
Accumulated deficit   (1,226)      
Total stockholders' equity   (1,226)      
Total liabilities and stockholders' equity   0      
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2020-06          
Debt Instrument [Line Items]          
Convertible senior notes, net   450,027      
Total liabilities   913,027      
Additional paid-in-capital   593,577      
Accumulated deficit   (589,694)      
Total stockholders' equity   95      
Total liabilities and stockholders' equity   $ 913,122