Consolidated Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
OPERATING ACTIVITIES:
Net loss	$ (25,478)	$ (61,822)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	32,126	35,338
Stock-based compensation	18,825	16,282
Loss on disposal of property and equipment	114	243
Provision for doubtful accounts	2,060	758
Accretion of available for sale securities	24	(412)
Non-cash lease expense	(209)
Deferred income taxes	(595)	(42)
Unrealized foreign currency gains, net	(823)	(897)
Changes in operating assets and liabilities, net of effect of business acquisitions:
Accounts receivable	(10,705)	(40,688)
Prepaid expenses and other assets	(51)	4,519
Accounts payable and accrued expenses	16,288	26,612
Other liabilities	407	(2,577)
Net cash provided by (used in) operating activities	31,983	(22,686)
INVESTING ACTIVITIES:
Purchases of property and equipment	(11,425)	(11,433)
Capitalized internal use software development costs	(8,463)	(8,507)
Acquisitions, net of cash acquired	(11,000)	0
Investments in available-for-sale securities	0	(23,991)
Maturities of available-for-sale securities	7,500	62,650
Sales of available-for-sale securities	0	9,228
Net cash provided by (used in) investing activities	(23,388)	27,947
FINANCING ACTIVITIES:
Proceeds from exercise of stock options	588	45
Proceeds from issuance of common stock under employee stock purchase plan	1,054	314
Taxes paid related to net share settlement	(1,847)	(1,638)
Net cash used in financing activities	(205)	(1,279)
EFFECT OF EXCHANGE RATE CHANGES ON CASH, CASH EQUIVALENTS AND RESTRICTED CASH	46	(172)
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	8,436	3,810
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period	80,452	76,642
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period	88,888	80,452
SUPPLEMENTAL DISCLOSURES OF OTHER CASH FLOW INFORMATION:
Cash paid for income taxes	291	379
Cash paid for interest	61	46
Capitalized assets financed by accounts payable and accrued expenses	141	6
Capitalized stock-based compensation	567	$ 520
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	$ 13,533