Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands					6 Months Ended	53 Months Ended
	Mar. 13, 2017	Mar. 08, 2017	Feb. 13, 2013	Aug. 01, 2012	Jun. 30, 2017	Jun. 30, 2017
Other Commitments [Line Items]
Allowance for bad debt					$ 261	$ 261
Tax Receivable Agreement
Other Commitments [Line Items]
Payments under tax receivable agreement						672
Tax Receivable Agreement
Other Commitments [Line Items]
Recorded liability					$ 28,600	$ 28,600
Class A Common Stock
Other Commitments [Line Items]
Issuance of common stock (in shares)	3,000,000	3,000,000
Class A Common Stock | Common Stock Issuance Over Allotment Option | Underwriters Over Allotment Option
Other Commitments [Line Items]
Issuance of common stock (in shares)					4,825,000
Series B Membership Interests
Other Commitments [Line Items]
Tax benefit payment, percentage			85.00%
Tax benefit saving, percentage			15.00%
Software Assignment Agreement | Vendor Contracts
Other Commitments [Line Items]
System purchase amount				$ 45
Master Service Agreement | Vendor Contracts
Other Commitments [Line Items]
Monthly payment for services agreement for the technology				$ 26
Service agreement term				5 years
Term of service agreement unless notice given				5 years
Required notice period to terminate service agreement				60 days
Exclusive option agreement maturity term				1 year
Exclusive Option Agreement
Other Commitments [Line Items]
Monthly payment for services agreement for the technology				$ 16
Service agreement term				5 years