Leases - Summary of Lease Costs (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Finance lease cost, amortization	$ 666,000	$ 570,000
Finance lease cost, interest expense	92,000	75,000
Total lease cost	2,021,000	1,784,000
Cost of revenue
Lessee, Lease, Description [Line Items]
Operating lease cost	880,000	814,000
Cost of revenue | Operating Lease
Lessee, Lease, Description [Line Items]
Variable lease costs	200,000	200,000
Cost of revenue | Finance Lease
Lessee, Lease, Description [Line Items]
Variable lease costs	700,000	700,000
Selling, general and administrative expenses
Lessee, Lease, Description [Line Items]
Operating lease cost	383,000	325,000
Selling, general and administrative expenses | Operating Lease
Lessee, Lease, Description [Line Items]
Variable lease costs	100,000	100,000
Selling, general and administrative expenses | Finance Lease
Lessee, Lease, Description [Line Items]
Variable lease costs	$ 0	$ 0