Leases - Balance Sheet Disclosures (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 11,034	$ 8,746
Operating lease liabilities	6,087	5,064
Operating lease liabilities — less current portion	5,438	4,329
Total operating lease liabilities	11,525	9,393
Property and equipment, gross	46,611	46,671
Less: accumulated depreciation and amortization	(40,467)	(39,190)
Property and equipment, net	6,144	7,481
Finance lease liabilities	2,812	3,518
Finance lease liabilities — less current portion	286	809
Total finance lease liabilities	$ 3,098	$ 4,327