Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 41,786	$ 51,201
Accounts receivable, net of allowances for doubtful accounts of $10,339 and $8,513, respectively	97,551	83,985
Prepaid expenses	12,084	7,175
Other current assets	950	709
Total current assets	152,371	143,070
Property and equipment
Accumulated depreciation	(83,966)	(77,697)
Property and equipment, net	21,563	25,150
Intangible assets, net	71,558	109,733
Goodwill	396,479	399,085
Other assets	2,781	2,708
Total assets	644,752	679,746
Current liabilities
Current portion of long-term debt, net	3,000	10,948
Accounts payable and accrued expense	35,398	33,504
Current portion of contingent consideration	970	695
Deferred revenue	3,881	3,955
Total current liabilities	43,249	49,102
Long-term debt, net	499,183	472,600
Deferred tax liabilities	6,769	7,335
Other liabilities	10,839	8,488
Total liabilities	560,040	537,525
Commitments and contingencies
Stockholders' equity
Common stock $0.0001 par value, 200,000,000 shares authorized, 42,637,315 and 42,529,017 issued and outstanding as of September 30, 2021 and December 31, 2020, respectively	4	4
Preferred Stock $0.0001 par value, 1,000,000 shares authorized, zero issued and outstanding as of September 30, 2021 and December 31, 2020
Additional paid-in capital	384,689	385,387
Accumulated deficit	(308,676)	(255,424)
Accumulated other comprehensive income	8,695	12,254
Total stockholders' equity	84,712	142,221
Total liabilities and stockholders' equity	644,752	679,746
Computer software and hardware
Property and equipment
Property and equipment, gross	75,288	72,211
Leasehold improvements
Property and equipment
Property and equipment, gross	27,182	27,271
Furniture, fixtures and other equipment
Property and equipment
Property and equipment, gross	$ 3,059	$ 3,365