Debt - Interest Expense (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Line of Credit Facility [Line Items]
Amortization of deferred financing costs	$ 317,000	$ 283,000	$ 612,000	$ 531,000
Interest Expense	2,316,000	2,452,000	4,561,000	5,897,000
Provider Earnout
Line of Credit Facility [Line Items]
Accretion related to earnout		100,000		100,000
Major Earnout
Line of Credit Facility [Line Items]
Accretion related to earnout		1,400,000	0	2,600,000
Convertible Subordinated Notes
Line of Credit Facility [Line Items]
Interest incurred on convertible subordinated notes to affiliate	0	0	0	1,052,000
Subordinated debt — affiliate
Line of Credit Facility [Line Items]
Interest incurred on debt	6,000	0	7,000	0
Promissory Note
Line of Credit Facility [Line Items]
Interest incurred on debt	363,000	0	690,000	0
Working Capital Facility
Line of Credit Facility [Line Items]
Letters of credit fees and commitment fees	422,000	193,000	780,000	417,000
Working Capital Facility | Senior Credit Facility
Line of Credit Facility [Line Items]
Interest incurred on debt	1,208,000	543,000	2,472,000	1,237,000
Level 3 | Fair Value, Measurements, Recurring
Line of Credit Facility [Line Items]
Accretion related to earnout	$ 0	$ 1,433,000	$ 0	$ 2,660,000