CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015		Sep. 30, 2014
Operating activities
Net loss	$ (31,211)		$ (24,341)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	5,166		4,145
Amortization of internally developed software	1,850		1,390
Amortization of intangible assets	2,308		646
Loss on disposal of property and equipment	19		16
Unrealized foreign currency gains	(203)		0
Noncash interest expense related to warrants issued in connection with debt	36		113
Stock-based compensation related to equity awards and restricted stock	12,040		6,353
Provision for bad debts	776		549
Deferred income tax benefits	(307)		(2,775)
Excess tax benefits from stock-based award activities	(9)		(103)
Changes in operating assets and liabilities, net of effect of acquisitions
Accounts receivable	(3,386)		(5,369)
Prepaid expenses and other current assets	(1,750)		(1,360)
Other assets	407		68
Accounts payable	(1,073)		139
Deferred revenues	(689)		584
Accrued expenses and other current liabilities	2,426		(183)
Net cash used in operating activities	(13,600)		(20,128)
Investing activities
Purchases of property and equipment	(8,217)		(2,728)
Capitalization of internally developed software	(4,107)		(2,381)
Acquisitions of businesses, net of cash acquired	(7,509)		(4,151)
Net cash used in investing activities	(19,833)		(9,260)
Financing activities
Repayment of notes payable	(2,967)		(2,391)
Debt issuance costs	(53)		0
Repurchase of unvested shares	(2)		(7)
Proceeds from exercise of common stock options	1,107		1,977
Proceeds from employee stock purchase plan, net of refunds	995		1,056
Stock issuance costs	(51)		0
Excess tax benefits from stock-based award activities	9		103
Net cash (used in) provided by financing activities	(962)		738
Effect of foreign exchange rate changes on cash and cash equivalents	(526)		0
Net decrease in cash and cash equivalents	(34,921)		(28,650)
Beginning of period	68,253	[1]	104,407
End of period	33,332		75,757
Supplemental disclosure of noncash investing and financing activities
Purchases of property and equipment recorded in accounts payable and accrued expenses	712		100
Acquisition of equipment through capital lease	1,905		0
Issuance of common stock under employee stock purchase plan	548		715
Issuance of common stock in connection with business combination	4,337		11,195
Shares withheld to cover payroll taxes related to the vesting of restricted stock units	$ 521		$ 0

[1] Derived from our audited consolidated financial statements as of December 31, 2014.