Debt - Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Contractual interest expense	$ 8,134	$ 7,885	$ 7,883
Amortization of debt issuance costs and accretion of debt discount	1,890	1,397	1,397
Accretion of debt discount	29,149	18,981	17,985
Total convertible debt interest expense	39,173	28,263	27,265
Finance lease interest expense	1,300	1,301	440
Total interest expense	$ 40,473	$ 29,564	$ 27,705