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Related Party Transactions - Additional Information (Details) - Fit for Life, LLC - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 11, 2016
Sep. 30, 2017
Sep. 30, 2017
Related Party Transaction [Line Items]      
Annual base rent for sublease     $ 0.3
Sublease contractual term     39 months
Recognized sublease income   $ 0.1 $ 0.2
Estimated future sublease income   $ 0.7 $ 0.7
Chief Executive Officer      
Related Party Transaction [Line Items]      
Percentage of outstanding common stock 10.00%