Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands, shares in Millions		1 Months Ended		3 Months Ended
	Jun. 05, 2015	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]
Tax receivables agreement, percent of tax savings to be paid		85.00%		85.00%
Rent expense				$ 2,600	$ 1,100
Payments of stock issuance costs				300
Restricted funds		$ 31,915		31,915		$ 40,416
Common Stock | Class A
Restricted Cash and Cash Equivalents Items [Line Items]
Issuance of common stock (in shares)	13.2	7.5	8.6
Letters of credit for facility leases
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted funds		$ 3,948		3,948		4,852
Collateral with financial institutions
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted funds		4,950		4,950		$ 4,950
Minimum | Letters of credit for facility leases
Restricted Cash and Cash Equivalents Items [Line Items]
Letters of credit outstanding, minimum		$ 3,900		$ 3,900