Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Financial Liabilities Measured at Fair Value on Recurring Basis (Detail)

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Fair Value Measurements - Summary of Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair value measurements, recurring - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability $ 2,814 $ 17
Notes payable 147 266
Total liabilities fair value 2,961 283
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability 0 0
Notes payable 0 0
Total liabilities fair value 0 0
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability 0 0
Notes payable 0 0
Total liabilities fair value 0 0
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability 2,814 17
Notes payable 147 266
Total liabilities fair value $ 2,961 $ 283