Stockholders' Equity - Financial Liabilities Subject to Fair Value Measurements (Detail) - Warrants - USD ($) $ in Thousands |
Sep. 30, 2017 |
Dec. 31, 2016 |
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| 2017 Warrants | ||
| Fair Value Inputs Liabilities Quantitative Information [Line Items] | ||
| Financial liabilities subject to fair value measurements | $ 1,392 | |
| 2017 Warrants | Basis of Fair Value Measurements, Level 3 | ||
| Fair Value Inputs Liabilities Quantitative Information [Line Items] | ||
| Financial liabilities subject to fair value measurements | $ 1,392 | |
| 2014 Warrants | ||
| Fair Value Inputs Liabilities Quantitative Information [Line Items] | ||
| Financial liabilities subject to fair value measurements | $ 49 | |
| 2014 Warrants | Basis of Fair Value Measurements, Level 3 | ||
| Fair Value Inputs Liabilities Quantitative Information [Line Items] | ||
| Financial liabilities subject to fair value measurements | $ 49 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Fair value of financial and nonfinancial obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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