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Debt (Tables)
 9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Convertible Debt
The following table summarizes the carrying value of the Convertible Notes as of September 30, 2020:
(in thousands)SEPTEMBER 30, 2020DECEMBER 31, 2019
Gross proceeds$316,250 $316,250 
Unamortized debt discount and issuance costs(111,562)(127,599)
Carrying value$204,688 $188,651