Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Operating leases:
Operating lease right-of-use assets	$ 23,356	$ 26,107
Current operating lease liabilities	5,046	5,557
Operating lease liabilities - less current portion	19,866	21,985
Total operating lease liabilities	24,912	27,542
Finance leases:
Property and equipment, at cost	1,397	1,813
Accumulated depreciation	(1,128)	(1,415)
Property and equipment, net	269	398
Current finance lease liabilities	189	278
Finance lease liabilities - less current portion	96	146
Total finance lease liabilities	$ 285	$ 424
Weighted Average Remaining Lease Term (in years):
Operating leases	6 years 3 months 21 days	6 years 6 months 18 days
Finance leases	1 year 10 months 9 days	1 year 11 months 4 days
Weighted Average Discount Rate:
Operating leases	5.70%	5.66%
Finance leases	5.09%	5.07%
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Lease liabilities	Lease liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Lease liabilities - less current portion	Lease liabilities - less current portion
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:Liabilities	us-gaap:Liabilities
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, plant and equipment, net	Property, plant and equipment, net