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Related parties (Details)	1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2014 USD ($) Automobile	May. 31, 2014 $ / shares shares	Jun. 30, 2013 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Device	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Company Affiliated with Investors [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties					$ 0	$ 100,000
Company Affiliated with Investors [Member] | Related Party Transaction, Contract Manufacturing Agreement [Member]
Related Party Transaction [Line Items]
Payments made to affiliated vendor for services rendered					200,000	12,200,000	$ 3,600,000
Chief Executive Officer (CEO) [Member] | Related Party Transaction, Chartered Aircraft Expenses [Member]
Related Party Transaction [Line Items]
Due to Related Parties					100,000	400,000
Payments to related parties					1,000,000	$ 500,000.0
Chief Executive Officer (CEO) [Member] | Related Party Transaction, Automobiles Purchased [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Number of Automobiles Purchased by Related Party | Automobile	7
Revenue from Related Parties	$ 300,000
Chief Financial Officer [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Stock Repurchased During Period, Shares | shares		41,154
Related Party Transaction, Shares Repurchased During Period, Purchase Price | $ / shares		$ 18.40
Immediate Family Member of Member of the Board [Member]
Related Party Transaction [Line Items]
Naming rights agreement, period							3 years
Payments to be made to related party for naming rights				$ 500,000
Aggregate payments to related party for naming rights					$ 500,000
Number of devices provided to related party at no cost | Device					100
Immediate Family Member of Management or Principal Owner [Member] | Related Party Transaction, Settlement of Legal Matter [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Legal Settlement, Amount			$ 200,000
Executive Officer [Member] | Related Party Transaction, Demand Payment Loan [Member]
Related Party Transaction [Line Items]
Loan amount to executive officer pursuant to demand payment loan			$ 200,000

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