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Long-Term Debt - Schedule of Interest (Details) - Convertible Debt - Convertible Senior Notes Due 2026 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Contractual Interest Expense	$ 1,941	$ 1,941	$ 5,822	$ 3,234
Amortization of Debt Discount	3,897	3,554	11,428	5,879
Amortization of Issuance Costs	260	245	769	407
Total Interest Expense	$ 6,098	$ 5,740	$ 18,019	$ 9,520

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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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