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Net Loss Per Share - Additional Information (Detail) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 29, 2017 $ / shares shares | Aug. 15, 2016 shares | Sep. 30, 2017 $ / shares shares | Dec. 31, 2016 shares
Earnings Per Share [Line Items] |  |  |  |
Reverse stock split ratio |  | 0.25 |  |
Common stock, shares authorized | shares |  | 100,000,000 | 100,000,000 | 100,000,000
Reverse stock split, effective date |  | Aug. 17, 2016 |  |
Reverse stock split, description |  |  | Common stock at a ratio of one (1) share for every four (4) shares outstanding, so that every four (4) outstanding shares of common stock before the Reverse Split represents one (1) share of common stock after the Reverse Split. |
Series B Preferred Stock [Member] |  |  |  |
Earnings Per Share [Line Items] |  |  |  |
Number of shares designated in preferred stock | shares |  |  | 3,000 |
Preferred stock, conversion price per share | $ / shares | $ 1.14 |  | $ 1.14 |
Preferred stock, dividend rate | 10.00% |  |  |
Preferred stock threshold consecutive trading days | 20 days |  |  |
Trading price of common stock exceeds conversion price, percentage | 400.00% |  |  |
Maximum allowable ownership percentage in issued and outstanding common stock after conversion | 19.99% |  |  |
Beneficial ownership percentage of common stock after conversion | 9.99% |  |  |
Period of notice prior to preferred stock conversion | 61 days |  |  |
Offering [Member] | Series B Preferred Stock [Member] |  |  |  |
Earnings Per Share [Line Items] |  |  |  |
Number of shares designated in preferred stock | shares | 5,500 |  |  |
Preferred stock, stated value per share | $ / shares | $ 1,000 |  |  |
Preferred stock, conversion price per share | $ / shares | $ 1.14 |  |  |
Preferred stock, dividend rate | 10.00% |  |  |
Preferred stock, dividend payment terms |  |  | The holders of Series B Preferred Stock are entitled to receive cumulative dividends out of funds legally available thereof at a rate of ten percent (10%) per annum, payable (i) when and as declared by the Board of Directors, in quarterly installments on March 1, June 1, September 1 and December 1, and (ii) upon conversion into Common Stock with respect the Series B Preferred Stock being converted. |

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