Income Taxes - The Components of Net Deferred Income Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Net deferred income tax assets:
Accrued expenses and reserves	$ 12,587	$ 8,810
Stock-based compensation	3,285	4,844
Software	(1,532)	(1,556)
Goodwill	(9,109)	(7,431)
Net operating loss carryforwards	26,893	25,989
Property and equipment	(8,816)	(4,410)
Deferred revenue	4,020	1,307
State Taxes	1,804	1,387
Contingent payments	(1,017)	(1,710)
Foreign exchange gain/loss	1,406	1,340
Operating lease right-of-use assets and lease liabilities	1,962	1,611
Other	512	522
Total deferred income tax assets	26,796	22,932
Less: valuation allowance	(21,700)	(19,916)
Net deferred income tax assets	5,096	3,016
Client Contracts
Net deferred income tax assets:
Client contracts and related intangibles	$ (5,199)	$ (7,771)