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Long-Term Debt - Schedule of Interest (Details) - Convertible Debt - Convertible Senior Notes Due 2026 - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Contractual Interest Expense	$ 1,941	$ 1,294	$ 3,881	$ 1,294
Amortization of Debt Discount	3,809	2,325	7,531	2,325
Amortization of Issuance Costs	256	161	509	161
Total Interest Expense	$ 6,006	$ 3,780	$ 11,921	$ 3,780

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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