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Debt (Tables)
 9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Convertible Notes
The following table summarizes the carrying value of the Convertible Notes as of September 30, 2019:
(in thousands)
SEPTEMBER 30, 2019
Gross proceeds
$
316,250

Unamortized debt discount and issuance costs
(132,697
)
Carrying value
$
183,553