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Debt (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Convertible Debt
The following table summarizes the carrying value of the Convertible Notes as of June 30, 2020:
(in thousands)JUNE 30, 2020DECEMBER 31, 2019
Gross proceeds$316,250  $316,250  
Unamortized debt discount and issuance costs(117,093) (127,599) 
Carrying value$199,157  $188,651