Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 42,879	$ 51,201
Accounts receivable, net of allowance for doubtful accounts of $9,902 and $8,513, respectively	95,699	83,985
Prepaid expenses	10,768	7,175
Other current assets	914	709
Total current assets	150,260	143,070
Property and equipment
Accumulated depreciation	(81,911)	(77,697)
Property and equipment, net	22,601	25,150
Intangible assets, net	99,282	109,733
Goodwill	397,665	399,085
Other assets	2,395	2,708
Total assets	672,203	679,746
Current liabilities
Current portion of long-term debt, net	3,000	10,948
Accounts payable and accrued expense	35,044	33,504
Current portion of contingent consideration	733	695
Deferred revenue	3,829	3,955
Total current liabilities	42,606	49,102
Long-term debt, net	496,721	472,600
Deferred tax liabilities	7,858	7,335
Other liabilities	9,991	8,488
Total liabilities	557,176	537,525
Commitments and contingencies
Stockholders' equity
Common stock $0.0001 par value, 200,000,000 shares authorized as of June 30, 2021, and December 31, 2020; 42,637,315 and 42,529,017 issued and outstanding as of June 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 June 30, 2021 and December 31, 2020
Additional paid-in capital	383,661	385,387
Accumulated deficit	(279,145)	(255,424)
Accumulated other comprehensive income	10,507	12,254
Total stockholders' equity	115,027	142,221
Total liabilities and stockholders' equity	672,203	679,746
Computer software and hardware
Property and equipment
Property and equipment, gross	74,137	72,211
Leasehold improvements
Property and equipment
Property and equipment, gross	27,201	27,271
Furniture, fixtures and other equipment
Property and equipment
Property and equipment, gross	$ 3,174	$ 3,365