Borrowings - Interest Expense and Amortization of Debt Discount (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Amortization of debt discount on the Notes	$ 1,795	$ 2,616	$ 2,472
3.50% Convertible Senior Notes due October 1, 2024 | Notes
Debt Instrument [Line Items]
Interest expense on the Notes	3,442	5,250	5,206
Amortization of debt discount on the Notes	$ 1,795	$ 2,616	$ 2,472