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Preferred Stock - Additional Information (Detail) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Oct. 16, 2016 | Dec. 31, 2015
Preferred Stock [Line Items] |  |  |
Common stock, par value | $ 0.001 |  | $ 0.001
Preferred stock, par value | $ 0.001 |  | $ 0.001
Preferred Shares Rights Agreement [Member] |  |  |
Preferred Stock [Line Items] |  |  |
Common stock, par value |  | $ 0.001 |
Dividend payable, Record Date | Oct. 26, 2015 |  |
Preferred stock, par value |  | 0.001 |
Rights exercise price |  | $ 6.69 |
Preferred Shares Rights Agreement, description | Each Right entitles the registered holder to purchase from the Company one one-thousandth of a share of Series A Participating Preferred Stock, par value $0.001 per share (“Preferred Shares”), of the Company at an exercise price of $6.69 per one one-thousandth of a Preferred Share, subject to adjustment. |  |
Preferred Shares Rights Agreement [Member] | Minimum [Member] |  |  |
Preferred Stock [Line Items] |  |  |
Percentage of ownership restriction by person or group | 20.00% |  |

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