Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Accounts payable and accrued expenses	$ 954	$ 1,712
Accrued payroll and related expenses	1,713	2,530
Stock-based compensation expense	2,668	10,226
Depreciation of property and equipment	3,061	5,480
Capitalized software	94	0
Non-compete agreements	0	1
Unbilled receivables and refund liabilities	2,029	904
Operating loss carry-forwards of foreign subsidiary	3,275	1,920
Federal operating loss carry-forwards	31,884	30,669
State operating loss carry-forwards	4,038	2,671
Other	883	1,930
Gross deferred tax assets	50,599	58,043
Less valuation allowance	45,565	52,002
Gross deferred tax assets net of valuation allowance	5,034	6,041
Intangible assets	2,775	3,049
Capitalized software	0	1,834
Other	898	1,117
Gross deferred tax liabilities	3,673	6,000
Net deferred tax assets	$ 1,361	$ 41