Financial Instruments - Fair Value of Warrants Based on Historical Volatilities (Detail) - Warrants With One Year or Less Remaining Term [Member] |
12 Months Ended |
|---|---|
Dec. 31, 2016 | |
| Class of Warrant or Right [Line Items] | |
| Expected Volatility | 60.81% |
| Risk-Free Interest Rate | 0.51% |
| Expected Life | 2 months 12 days |