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Revenue Recognition - Summary of Impact of Adoption of the New Standard to Previously Reported Selected Financial Statement Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Gross revenues   $ 109,885   $ 215,768
Net revenues   109,885   215,768
Operating income $ 19,095 2,578 $ 35,776 7,896
Net income $ 3,594 1,713 $ 7,524 7,055
Accounting Standards Update 2014-09 | As Reported        
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Gross revenues   116,162   228,297
Promotional allowances   (5,669)   (11,158)
Net revenues   110,493   217,139
Operating income   2,578   7,896
Net income   1,713   7,055
Accounting Standards Update 2014-09 | Adjustments        
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Gross revenues   (6,277)   (12,529)
Promotional allowances   5,669   11,158
Net revenues   $ (608)   $ (1,371)