Income Taxes - Schedule of the Tax Effects of Temporary Differences and Carry-Forwards That Give Rise to Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax assets:
Accounts payable and accrued expenses	$ 1,215	$ 737
Accrued payroll and related expenses	1,691	3,062
Stock-based compensation expense	3,508	3,531
Depreciation of property and equipment	1,711	2,579
Capitalized Software	0	0
Non-compete agreements	0	0
Unbilled receivables and refund liabilities	1,811	2,216
Operating loss carry-forwards of foreign subsidiary	11,000	10,907
Federal operating loss carry-forwards	17,161	33,087
State operating loss carry-forwards	3,591	3,919
Other	376	1,181
Gross deferred tax assets	42,064	61,219
Less valuation allowance	34,776	50,114
Gross deferred tax assets net of valuation allowance	7,288	11,105
Deferred income tax liabilities:
Intangible assets	1,987	2,299
Capitalized software	29	1,928
Other	3,734	4,609
Gross deferred tax liabilities	5,750	8,836
Net deferred tax assets	$ 1,538	$ 2,269