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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Fair value of warrant derivative liabilities at issuance, recorded as debt discount $ 35 $ 35 $ 11
Fair Value, Measurements, Recurring [Member] | Embedded Compound Derivative [Member]      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Derivative liability   35  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Embedded Compound Derivative [Member]      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Derivative liability $ 11 $ 35