Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Level 2 | 3.00% Convertible notes | Convertible debt
Assets
Estimated fair value	$ 187,300
Level 2 | Term Facility | Medium-term Notes
Assets
Estimated fair value	145,800
Recurring basis
Assets
Cash and cash equivalents	71,615	$ 111,533
Recurring basis | Cash
Assets
Cash and cash equivalents	21,363	41,285
Recurring basis | Money market funds
Assets
Cash and cash equivalents	50,252	70,248
Recurring basis | Level 1
Assets
Cash and cash equivalents	71,615	111,533
Recurring basis | Level 1 | Cash
Assets
Cash and cash equivalents	21,363	41,285
Recurring basis | Level 1 | Money market funds
Assets
Cash and cash equivalents	50,252	70,248
Recurring basis | Level 2
Assets
Cash and cash equivalents	0	0
Recurring basis | Level 2 | Cash
Assets
Cash and cash equivalents	0	0
Recurring basis | Level 2 | Money market funds
Assets
Cash and cash equivalents	0	0
Recurring basis | Level 3
Assets
Cash and cash equivalents	0	0
Recurring basis | Level 3 | Cash
Assets
Cash and cash equivalents	0	0
Recurring basis | Level 3 | Money market funds
Assets
Cash and cash equivalents	$ 0	$ 0