Debt - Summarized Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total Interest Expense	$ 563	$ 2,282
Convertible Debt | 3.25% Convertible Senior Notes due 2020
Debt Instrument [Line Items]
Amortization of debt discount and deferred issuance costs	368	1,179
Coupon interest	$ 195	$ 1,103