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Common Stock - Additional Information (Detail) |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 09, 2016 shares | Sep. 30, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2011 USD ($) shares | Dec. 31, 2014 shares
Class Of Stock [Line Items] |  |  |  |  |
Common stock shares pledged under guarantee |  | 5,896,000 | 5,896,000 |  |
Common stock, shares authorized |  | 33,000,000 | 33,000,000 |  | 33,000,000
Common stock, shares, issued |  | 22,229,570 | 22,139,480 |  | 22,039,600
Common stock, voting right |  |  | The holders of the common stock are entitled to one vote per share. |  |
Subsequent Event |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Common stock split ratio | 2,200 |  |  |  |
Common stock, shares authorized | 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 | $ 1,179,000 |  |
Convertible preferred stock, shares issued upon conversion |  | 14,300,000 | 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 | 5 years |  |

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