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Accounts payable and accrued liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Accounts payable $ 3,211 $ 2,104
Accrued expenses 7,462 5,311
Accrued compensation and benefits 2,950 2,352
Other current liabilities 38 31
Total accounts payable and accrued liabilities $ 13,661 $ 9,798