Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lease, Cost [Abstract]
Operating lease cost	$ 1,404	$ 1,248	$ 4,153	$ 3,478
Short-term lease cost	135	88	388	649
Variable lease cost	188	150	450	434
Total lease cost	$ 1,727	$ 1,486	4,991	4,561
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases			$ 4,218	$ 3,605
Weighted-average remaining lease term — operating leases	5 years 7 months 6 days	6 years 4 months 24 days	5 years 7 months 6 days	6 years 4 months 24 days
Weighted-average discount rate — operating leases	4.60%	4.80%	4.60%	4.80%