Intangible Assets - Summary and Other (Details)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended		21 Months Ended
	Nov. 30, 2013 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 item	Sep. 30, 2017 USD ($) item
Composition of intangible assets
Total gross amount		$ 18,024,000		$ 18,024,000		$ 17,743,000		$ 18,024,000
Accumulated amortization		(13,936,000)		(13,936,000)		(11,176,000)		(13,936,000)
Total		4,088,000		$ 4,088,000		$ 6,567,000		$ 4,088,000
Useful life/amortization period				60 months		60 months
Amortization expense		900,000	$ 900,000	$ 2,600,000	$ 2,600,000
Number of international distributors | item								2
Estimated amortization expense
2017		3,800,000		3,800,000				$ 3,800,000
2018		3,100,000		3,100,000				3,100,000
GMP royalty buyout
Composition of intangible assets
Total gross amount		17,500,000		17,500,000		$ 17,500,000		17,500,000
Non-compete agreements
Composition of intangible assets
Total gross amount		524,000		524,000		$ 243,000		$ 524,000
Amortization expense		$ 66,000	$ 23,000	194,000	$ 69,000
Number of international distributors | item							2
The amount of fair value of the non-compete provisions recorded as intangible asset				$ 500,000
Non-compete agreements | Minimum
Composition of intangible assets
Useful life/amortization period				1 year
Non-compete agreements | Maximum
Composition of intangible assets
Useful life/amortization period				2 years
Buy-out Agreement with GMP | GMP royalty buyout
Composition of intangible assets
Intangible asset purchase amount	$ 17,500,000
Useful life/amortization period	5 years
Buy-out Agreement with GMP | GMP Note Parties
Composition of intangible assets
Face amount at time of issuance	$ 17,500,000