Long-term Debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
2019 Convertible Senior Notes due 2026
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 8	$ 93	$ 19	$ 187
Cash interest expense	38	432	87	863
Total interest expense	46	525	106	1,050
2021 Convertible Senior Notes due 2027
Debt Instrument [Line Items]
Amortization of debt issuance costs	395		788
Cash interest expense	809		1,617
Total interest expense	1,204		2,405
Convertible Senior Notes
Debt Instrument [Line Items]
Amortization of debt issuance costs	403	93	807	187
Cash interest expense	847	432	1,704	863
Total interest expense	$ 1,250	$ 525	$ 2,511	$ 1,050