Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues	$ 64,381	$ 78,332	$ 142,652	$ 153,358
Cost of revenues	34,214	39,463	73,734	76,919
Gross profit	30,167	38,869	68,918	76,439
Operating expenses
General and administrative	12,400	14,813	28,253	29,656
Research and development	1,639	1,489	3,306	2,922
Sales and marketing	8,660	11,466	20,305	24,169
Depreciation and amortization	8,985	9,893	17,901	19,718
Total operating expenses	31,684	37,661	69,765	76,465
Income (loss) from operations	(1,517)	1,208	(847)	(26)
Other expenses
Other expense	63	36	91	131
Interest expense	12,970	12,387	25,932	24,453
Loss before income taxes	(14,550)	(11,215)	(26,870)	(24,610)
Income tax provision	368	233	574	329
Net loss	(14,918)	(11,448)	(27,444)	(24,939)
Other comprehensive income, net of tax
Foreign currency translation	2,733	(855)	(1,695)	(45)
Total other comprehensive income, net of tax	2,733	(855)	(1,695)	(45)
Comprehensive loss	$ (12,185)	$ (12,303)	$ (29,139)	$ (24,984)
Net loss per share - basic and diluted	$ (0.35)	$ (0.27)	$ (0.65)	$ (0.59)
Weighted average shares outstanding - basic and diluted	42,529,017	42,369,357	42,529,017	42,336,093