Income Taxes - The Components of Net Deferred Income Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Net deferred income tax assets:
Accrued expenses and reserves	$ 8,810	$ 7,180
Stock-based compensation	4,844	3,695
Software	(1,556)	(3,001)
Goodwill	(7,431)	(6,635)
Net operating loss carryforwards	25,989	24,857
Property and equipment	(4,410)	(8,315)
Convertible debt securities		19
Deferred revenue	1,307	2,606
State Taxes	1,387	4,520
Contingent payments	(1,710)	(2,333)
Foreign exchange gain/loss	1,340	2,048
R&D credit	207	1,413
Operating lease right-of-use assets and lease liabilities	1,611
Other	315	383
Total deferred income tax assets	22,932	22,696
Less: valuation allowance	(19,916)	(19,814)
Net deferred income tax assets	3,016	2,882
Client contracts
Net deferred income tax assets:
Client contracts and related intangibles	$ (7,771)	$ (3,741)