Subsequent Events (Details)	Oct. 21, 2016 item $ / shares shares	Sep. 30, 2016 shares	Dec. 31, 2015 shares
Common Class B
Subsequent events
Common stock, shares issued		30,027,418	30,027,418
Common stock, shares outstanding		30,027,418	30,027,418
Common Class A
Subsequent events
Common stock, shares issued		15,698,493	15,342,440
Subsequent event | Common Class B
Subsequent events
Common stock, shares issued	20,800,998
Common stock, shares outstanding	20,800,998
Number of shares subject to forfeiture	1,080,617
Subsequent event | Common Class A
Subsequent events
Common stock, shares issued	21,607,230
Common stock, shares outstanding	21,607,230
Number of shares subject to forfeiture	544,383
Subsequent event | Controlling stockholder | InterMedia Partners VII, L.P. ("IMP") | Common Class B
Subsequent events
Number of shares converted	9,226,420
Subsequent event | Controlling stockholder | InterMedia Partners VII, L.P. ("IMP") | Common Class A
Subsequent events
Number of shares issued on stock conversion	9,226,420
Number of shares subject to forfeiture issued on conversion of stock	419,383
Market price per share to be achieved for avoiding forfeiture | $ / shares	$ 15.00
Number of trading days considered during consecutive trading day period | item	20
Consecutive trading day period during which common stock price should equal or exceed threshold price	30 days