Business Acquisition (Details) - USD ($)		3 Months Ended		9 Months Ended		12 Months Ended	18 Months Ended
	Dec. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Sep. 30, 2016
Business Acquisition [Line Items]
Net loss		$ 7,594,000	$ 3,728,000	$ 22,568,000	$ 16,884,000
Amortization expense		817,000	$ 188,000	2,738,000	$ 657,000
Goodwill, acquired during period						$ 58,357,000
Octane Fitness
Business Acquisition [Line Items]
Purchase price	$ 115,000,000
Net sales		16,200,000		40,900,000
Net loss		1,100,000		300,000
Amortization expense		800,000		2,300,000
Inventory step-up expense		$ 100,000		1,100,000
Measurement period adjustments, assets, goodwill and liabilities				671,000
Acquisition costs				$ 300,000			$ 900,000
JPMorgan Chase Bank, N.A. | Term Loan | Octane Fitness
Business Acquisition [Line Items]
Maximum revolving secured credit line	$ 80,000,000.0					80,000,000.0
Retail
Business Acquisition [Line Items]
Goodwill, acquired during period						58,357,000
Retail | Octane Fitness
Business Acquisition [Line Items]
Goodwill, acquired during period						$ 58,300,000