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Redeemable Convertible Preferred Stock - Additional Information (Detail) |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
May 02, 2012 USD ($) | Dec. 31, 2018 USD ($) Installment $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Aug. 01, 2017 $ / shares shares | Mar. 23, 2017 $ / shares | Apr. 30, 2012 shares | Apr. 13, 2012 $ / shares shares
Temporary Equity [Line Items] |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares issued |  | 1,000,000 | 1,000,000 |  |  |  |
Warrant exercise price per share | $ / shares |  |  |  |  | $ 2.26 |  |
Common stock, shares issued |  | 9,413,245 | 8,850,532 |  |  |  | 1,000,000
Warrants to purchase common stock |  | 325,000 |  |  |  |  |
Redeemable convertible preferred stock, shares authorized |  | 1,000,000 | 1,000,000 |  |  |  |
Preferred stock and warrants value issued | $ | $ 5,000,000 |  |  |  |  |  |
Warrants value | $ |  | $ 840,000 |  |  |  |  |
Accretion amount | $ |  | $ 60,000 | $ 56,000 |  |  |  |
Common Stock | Repricing Agreement |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Convertible preferred stock, shares issuable upon conversion |  |  | 1 |  |  |  |
Maximum | Repricing Agreement |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Limitations for issuance of common stock or voting power outstanding to holder, in percentage |  |  |  | 19.99% |  |  |
Warrants Exercise Price Tranche One |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Warrant exercise price per share | $ / shares |  |  |  |  |  |  | $ 6.00
Warrants to purchase common stock |  |  |  |  |  |  | 125,000
Warrants Exercise Price Tranche Two |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Warrant exercise price per share | $ / shares |  |  |  |  |  |  | $ 7.00
Warrants to purchase common stock |  |  |  |  |  |  | 200,000
Securities Purchase Agreement |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Number of warrants |  |  |  |  |  |  | 325,000
Series A Convertible Preferred Stock |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  |  |  |  |  | $ 5.00
Redeemable convertible preferred stock, shares authorized |  |  |  |  |  | 1,000,000 |
Cumulative dividends at a rate |  | 6.00% |  |  |  |  |
Preferred stock value | $ | $ 4,160,000 |  |  |  |  |  |
Series A Convertible Preferred Stock | Common Stock | Repricing Agreement |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  | $ 2.26 |  |  |  |
Convertible preferred stock, shares issuable upon conversion |  |  | 2,212,389 |  |  |  |
Series A Convertible Preferred Stock | Accounts Payable and Other Accrued Expenses |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Total accrued but unpaid dividends | $ |  | $ 80,000 | $ 80,000 |  |  |  |
Series A Convertible Preferred Stock | Scenario, Plan |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Redeemable convertible preferred stock, liquidation preference per share | $ / shares |  | $ 5.00 |  |  |  |  |
Number of redemption price, accrued and unpaid dividends installment payments | Installment |  | 36 |  |  |  |  |
Annual interest rate on redemption value payable |  | 6.00% |  |  |  |  |
Redemption price per share | $ / shares |  | $ 5.00 | $ 5.00 |  |  |  |
Series A Convertible Preferred Stock | Scenario, Plan | Maximum |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Majority outstanding shares redeemable date |  | Apr. 30, 2017 |  |  |  |  |
Series A Convertible Preferred Stock | Securities Purchase Agreement |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares issued |  |  |  |  |  |  | 1,000,000
Warrant exercise price per share | $ / shares |  |  |  |  |  |  | $ 5.00
Series A Warrants | Common Stock | Repricing Agreement |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Warrant exercise price per share | $ / shares |  |  |  | $ 2.72 |  |  |
Warrants to purchase common stock |  |  |  | 125,000 |  |  |
Series B Warrants | Common Stock | Repricing Agreement |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Warrant exercise price per share | $ / shares |  |  |  | $ 3.17 |  |  |
Warrants to purchase common stock |  |  |  | 200,000 |  |  |

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