Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net loss from continuing operations	$ (19,700)	$ (23,850)	$ (29,176)
Net income (loss) from discontinued operations	21,927	2,903	(14,054)
Adjustments required to reconcile net loss to net cash used in operating activities:
Impairment charges	0	0	22,665
Depreciation and amortization expense	7,760	9,173	8,344
Gain on sale of discontinued operations, before income taxes	(14,958)	0	0
Loss from sublease	0	246	0
Bad debt expense	356
Bad debt recovery		(66)	(87)
Mark-to-market expense	148	1,263	113
Compensation expense related to the acquisition-contingent consideration	1,810	3,568	0
Deferred tax benefit	(332)	(92)	(61)
Loss on disposal of property and equipment	392	23	0
Stock based compensation expense	5,394	3,900	4,007
Stock-based long-term incentive compensation expense	0	(300)	436
Net change in operating assets and liabilities:
Increase in accounts receivable	(19,891)	(8,277)	(22,675)
Decrease in contingent consideration on acquisition	(4,753)	(3,406)	0
(Increase)/decrease in prepaid expenses, other current assets and other long-term assets	(3,157)	583	(3,381)
Increase in accounts payable and accrued expenses	13,831	6,728	20,178
(Decrease) increase in other current liabilities	(126)	179	0
Decrease in deferred tax liability	(110)	0	0
(Decrease)/increase in deferred rent and security deposits payable	(629)	628	5,639
Decrease/(increase) in restricted cash	770	(170)	0
Increase/(decrease) in deferred income and other liabilities	1,407	(103)	93
Net cash used in operating activities	(9,861)	(7,070)	(7,959)
Cash flows from investing activities:
Purchase of property and equipment	(1,113)	(2,933)	(7,732)
Acquisition, net of cash acquired	0	0	(1,672)
Cash received from sale of discontinued operations	49,000	0	0
Expenses paid with respect to sale of discontinued operations	(1,954)	0	0
Net cash provided by (used in) investing activities	45,933	(2,933)	(9,404)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock purchase plan	446	499	0
Decrease in contingent consideration on acquisition	0	(431)	0
Proceeds from the exercise of stock option awards	699	161	108
Principal portion of capital lease payments	(214)	(19)	0
Treasury stock — repurchase of stock	(2,406)	(6,037)	0
Tax withholdings related to net share settlements of restricted stock units	(1,842)	(505)	(494)
Net cash used in financing activities	(3,317)	(6,332)	(386)
Net increase (decrease) in cash and cash equivalents	32,755	(16,335)	(17,749)
Effect of exchange rate changes in cash and cash equivalents	405	(392)	(151)
Cash and cash equivalents at beginning of year	43,160	59,887	77,787
Cash and cash equivalents at end of year	$ 76,320	$ 43,160	$ 59,887