Leases - Costs Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Leases
Weighted average remaining lease term	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%
Lease cost
Net operating lease costs	$ 429	$ 414
Minimum
Leases
Remaining lease term	1 year		1 year
Maximum
Leases
Remaining lease term	7 years		7 years
Lease extension term	5 years
Lease Term	12 months
Cost of revenues
Lease cost
Operating lease cost	$ 385	385
Selling, general and administrative expense.
Lease cost
Operating lease cost	65	56
Interest and other income, net
Lease cost
Rental revenues	$ (21)	$ (27)