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Common Stock - Additional Information (Detail) |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 09, 2016 shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2011 USD ($) shares | Dec. 31, 2015 shares
Class Of Stock [Line Items] |  |  |  |
Common stock, value issued | $ |  | $ 127,302,000 |  |
Common stock shares pledged under guarantee |  | 5,896,000 |  |
Common stock split ratio | 2,200 |  |  |
Common stock, shares authorized | 350,000,000 | 350,000,000 |  | 350,000,000
Preferred stock, undesignated shares authorized | 10,000,000 |  |  |
Series A Preferred Stock |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Common stock, shares issued |  |  | 14,300,000 |
Common stock, value issued | $ |  |  | $ 0 |
Convertible preferred stock value issued upon conversion | $ |  | $ 1,179,000 |  |
Convertible preferred stock, shares issued upon conversion |  | 14,300,000 |  |
Convertible preferred stock, settlement terms |  | the amount allocated to the Series A Investor’s common shares was accreted to the face value of the Series A Preferred Stock with a corresponding charge to interest expense over the 5-year term of the Series A Preferred Stock. |  |
Preferred shares corresponding charge interest expense period |  | 5 years |  |

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