Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Leases [Abstract]
Operating lease right-of-use assets	$ 44,236	$ 45,792	$ 33,725
Operating - current	8,941	9,143	7,603
Operating - noncurrent	35,810	37,199	26,084
Total operating lease liabilities	44,751	46,342	33,687
Property and equipment, gross	3,569	3,569	3,566
Accumulated amortization	(3,188)	(3,112)	(2,903)
Property and equipment, net	381	457	663
Other current liabilities	193	384	1,125
Other long-term liabilities	0	0	6
Total finance lease liabilities	$ 193	$ 384	$ 1,131