Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net loss	$ (14,856)	$ (12,526)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	9,816	11,837
Non-cash interest	4,815	4,507
Loss on debt extinguishment	7,257
Stock-based compensation	978	825
Provision for losses on accounts receivable	972	784
Deferred income taxes	342	112
Change in fair value of contingent consideration	19	29
Change in fair value of private warrants	(1,969)
Changes in operating assets and liabilities:
Accounts receivable	(680)	(7,487)
Prepaid expenses and other assets	(5,087)	(8,151)
Accounts payable and accrued expenses	(2,986)	(588)
Deferred revenue	(1,436)	(1,298)
Net cash used in operating activities	(2,815)	(11,956)
Investing activities
Acquisitions, net of cash acquired		(2,334)
Purchases of property and equipment	(3,088)	(2,767)
Net cash used in investing activities	(3,088)	(5,101)
Financing activities
Issuance of common stock	34
Revolving credit facility - draws		29,000
Payments for capital lease obligations	(285)	(224)
Debt issuance costs	(2,031)
Proceeds from long-term debt, net of original issue discount	294,000
Retirement of debt	(289,000)
Payments on long-term debt		(4,250)
Net cash provided by financing activities	2,718	24,526
Effect of foreign exchange rates	(208)	(265)
Net (decrease) increase in cash	(3,393)	7,204
Cash at beginning of period	51,201	43,407
Cash at end of period	47,808	50,611
Supplemental disclosure:
Cash paid for interest	12,232	8,704
Income tax refunds	(591)	(266)
Significant non-cash investing and financing activities
Purchases of property and equipment in accounts payable and accrued expenses on the consolidated balance sheets	$ 682	$ 931