UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net revenue	$ 191,517	$ 175,789	$ 370,473	$ 344,373
Cost of revenue (excluding depreciation expense)	126,864	115,832	248,156	229,368
Gross profit	64,653	59,957	122,317	115,005
Operating expenses:
Service location operating expenses	38,428	38,861	78,615	78,160
General and administrative expenses	11,796	10,931	23,290	21,600
Depreciation and amortization expense	4,665	6,366	9,738	12,852
Restructuring, acquisition, integration, and other expenses	2,871	2,024	8,892	3,906
Total operating expenses	57,760	58,182	120,535	116,518
Operating income (loss)	6,893	1,775	1,782	(1,513)
Other expense:
Interest expense, net	15,638	13,805	30,869	27,200
Change in fair value of equity linked liabilities	5,216	3,064	(4,784)	(375)
Loss (gain) on dispositions	51	(13)	(25)	(318)
Total other expense	20,905	16,856	26,060	26,507
Loss from continuing operations before income taxes	(14,012)	(15,081)	(24,278)	(28,020)
Income tax expense	(154)	(43)	(170)	(91)
Loss from continuing operations	(14,166)	(15,124)	(24,448)	(28,111)
Loss from discontinued operations, net of income taxes	(1,500)	(15)	(1,500)	(45)
Net loss	(15,666)	(15,139)	(25,948)	(28,156)
Accrued dividends on preferred stock	(3,068)	(2,756)	(6,025)	(5,413)
Loss attributable to common stockholders	$ (18,734)	$ (17,895)	$ (31,973)	$ (33,569)
Basic loss per share:
Loss from continuing operations (in dollars per share)	$ (0.13)	$ (0.14)	$ (0.24)	$ (0.26)
Loss from discontinued operations (in dollars per share)	(0.01)	0.00	(0.01)	0.00
Basic loss per share (in dollars per share)	(0.14)	(0.14)	(0.25)	(0.26)
Diluted loss per share:
Loss from continuing operations (in dollars per share)	(0.13)	(0.14)	(0.27)	(0.26)
Loss from discontinued operations (in dollars per share)	(0.01)	0.00	(0.01)	0.00
Diluted loss per share (in dollars per share)	$ (0.14)	$ (0.14)	$ (0.28)	$ (0.26)
Weighted average number of common shares outstanding:
Basic (in shares)	128,779	128,038	128,446	127,906
Diluted (in shares)	128,779	128,038	130,499	130,158