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Financial instruments - Fair Value of Significant Unobservable Inputs (Detail) - Significant Unobservable Inputs (Level 3) [Member] - Common Stock Warrants [Member] - Derivative Financial Instruments, Liabilities [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Beginning balance $ 72
Change in fair value of derivative liabilities 52
Ending balance $ 124