Leases - Costs Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Leases
Weighted average remaining lease term	2 years		2 years		3 years
Lessee, Operating Lease, Existence of Option to Extend [true false]			true
Average discount rate (as a percent)	3.40%		3.40%		3.40%
Lease cost
Net operating lease costs	$ 497	$ 504	$ 926	$ 919
Minimum
Leases
Remaining lease term	1 year		1 year		1 year
Maximum
Leases
Remaining lease term	7 years		7 years		7 years
Lease extension term			5 years
Lease Term	12 months		12 months
Cost of revenues
Lease cost
Operating lease cost	$ 450	455	$ 835	840
Selling, general and administrative expense.
Lease cost
Operating lease cost	67	57	132	114
Interest and other income, net
Lease cost
Rental revenues	$ (20)	$ (8)	$ (41)	$ (35)