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Related party transactions (Details) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) Device | Sep. 30, 2015 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 USD ($)
Company Affiliated with Investors [Member] | Related Party Transaction, Contract Manufacturing Agreement [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expense for services rendered | $ 0 | $ 0 |  |
Payments to related parties |  | 200,000 |  |
Accounts payable to related party | 0 |  |  | $ 0
Chief Executive Officer (CEO) [Member] | Related Party Transaction, Chartered Aircraft Expenses [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expense for services rendered | 700,000 | $ 700,000 |  |
Accounts payable to related party | 0 |  |  | $ 100,000
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 |  |  |

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