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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 15, 2015 | Sep. 30, 2015 | Sep. 30, 2015 | Dec. 31, 2014
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |
Loss on increase in estimated fair value of derivatives | $ (2,692) |  | $ (2,291) |
Loss upon the conversion Bridge Notes including the extinguishment of the embedded compound derivative |  |  | (1,170) |
Fair Value, Measurements, Recurring [Member] | Embedded Compound Derivative [Member] |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |
Derivative liability |  | $ 11 | 11 |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Embedded Compound Derivative [Member] |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |
Derivative liability |  | 11 | 11 |
2015 Bridge Notes [Member] |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |
Fair value of derivative liability |  | 1,547 | 1,547 |
Loss upon the conversion Bridge Notes including the extinguishment of the embedded compound derivative | $ (1,170) | $ 0 | $ (1,170) |
Debt instrument conversion percentage |  | 100.00% | 100.00% |
Preferred Stock Warrants [Member] |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |
Warrant outstanding |  | 0 | 0 | 14,544,247
Preferred Stock Warrants [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |
Derivative liability |  |  |  | $ 1,309
Preferred Stock Warrants [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |
Derivative liability |  |  |  | $ 1,309

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