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Convertible Preferred Stock - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 24, 2014 | Dec. 31, 2014
Class of Stock [Line Items] |  |
Convertible preferred stock converted to common stock, value |  | $ 56,155
Common Stock [Member] |  |
Class of Stock [Line Items] |  |
Convertible preferred stock converted to common stock, shares | 11,517,222 |
Convertible preferred stock converted to common stock, value | $ 56,200 |

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