Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities
Net loss	$ (16,480)	$ (33,349)	$ (33,171)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Depreciation	6,035	6,993	5,669
Amortization of internally developed software	2,988	2,550	1,905
Amortization of intangible assets	3,080	3,134	1,131
(Gain) loss on disposal of property and equipment	(3)	19	16
Unrealized foreign currency gains	(419)	(216)	0
Noncash interest expense related to debt agreements	27	42	124
Stock-based compensation related to equity awards and restricted stock	10,295	15,619	9,242
Provision for bad debts	2,328	1,210	821
Deferred income tax benefits	(305)	(177)	(2,258)
Excess tax benefits from stock-based award activities	0	(3)	(126)
Payment of contingent consideration for prior acquisition	(93)	0	0
Changes in operating assets and liabilities, net of effect of acquisition
Accounts receivable	795	(2,986)	(4,561)
Prepaid expenses and other current assets	546	575	(2,009)
Other assets	(346)	348	(497)
Accounts payable	741	(1,597)	1,387
Deferred revenues	(628)	(625)	(540)
Accrued expenses and other current liabilities	(2,842)	1,382	(1,523)
Net cash provided by (used in) operating activities	5,719	(7,081)	(24,390)
Investing activities
Purchases of property and equipment	(1,207)	(8,584)	(5,317)
Proceeds from disposal of property and equipment	5	0	0
Capitalization of internally developed software	(4,712)	(5,568)	(3,146)
Acquisitions of business, net of cash acquired	0	(7,738)	(4,151)
Net cash used in investing activities	(5,914)	(21,890)	(12,614)
Financing activities
Repayment of notes payable	(1,436)	(3,649)	(3,130)
Debt issuance costs	0	(53)	0
Repurchase of unvested shares	0	(2)	(20)
Proceeds from exercise of common stock options	390	1,439	2,472
Proceeds from employee stock purchase plan, net	663	968	1,402
Excess tax benefits from stock-based award activities	0	3	126
Net cash (used in) provided by financing activities	(383)	(1,294)	850
Effect of foreign exchange rate changes on cash and cash equivalents and restricted cash	(1,035)	(662)	0
Net decrease in cash and cash equivalents and restricted cash	(1,613)	(30,927)	(36,154)
Beginning of year	37,326	68,253	104,407
End of year	35,713	37,326	68,253
Supplemental disclosures of other cash flow information
Cash paid for interest	189	106	106
Cash paid for income taxes	728	404	221
Supplemental disclosure of noncash investing and financing activities
Acquisition of equipment through capital leases	1,864	2,350	0
Purchases of property and equipment recorded in accounts payable and accrued expenses	5	0	1,364
Issuance of common stock under employee stock purchase plan	547	1,035	1,402
Issuance of common stock in connection with acquisitions of businesses	$ 0	$ 4,338	$ 11,195