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Subsequent Events - Additional Information (Detail) |  |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |  |  |  |
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Aug. 03, 2018 USD ($) shares | Jul. 27, 2018 USD ($) | Jul. 20, 2018 USD ($) | May 02, 2018 $ / shares shares | Feb. 26, 2018 shares | Feb. 09, 2018 USD ($) $ / shares shares | Nov. 06, 2017 $ / shares shares | Jul. 21, 2016 $ / shares shares | Jul. 19, 2016 shares | Jun. 30, 2018 $ / shares shares | Dec. 31, 2017 $ / shares shares | Jan. 25, 2018 shares | Dec. 31, 2016 $ / shares shares | Dec. 31, 2015 $ / shares | Dec. 31, 2014 $ / shares
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pre-funded warrants |  |  |  |  |  |  |  |  |  | 76,000 |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  | 932,159 | 263,305 |  | 24 |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  | 932,158 | 263,304 |  | 23 |  |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  |  | 170,000,000 | 1,000,000,000 | 1,000,000,000 |  | 500,000,000 |  |
Reverse stock split ratio |  |  |  | 0.0020 |  |  | 0.0029 | 0.0625 |  |  |  |  |  |  |
Reverse stock split |  |  |  | 1:500 |  |  | 1:350 |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 | $ 0.01 |  | $ 0.01 |  |
Number of fractional shares were issued in connected with the reverse stock split |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | 1,225 |  | 281,750 | $ 2,072,000 | $ 4,900,000
Reverse stock split ratio |  |  |  |  |  |  |  |  | 0.1 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 19,712,000 |  | $ 19,712,000 | $ 19,712,000 | $ 19,712,000
Reverse stock split ratio |  |  |  |  |  |  |  |  | 0.05 |  |  |  |  |  |
Board of Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  | 0.0020 |  |  |  |  |  |  |  |  |  |  |
Reverse stock split |  |  |  | 1-for-500 |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |
Board of Directors [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  |  | 0.01 |  |  |  |  |  |  |  |  |  |
Board of Directors [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  |  | 0.0020 |  |  |  |  |  |  |  |  |  |
OTCQB [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  | 0.0020 |  |  | 0.0029 |  |  |  |  |  |  |  |
Reverse stock split |  |  |  | 1:500 |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  |  | $ 0.01 |  |  |  |  |  |  |  |
Number of fractional shares were issued in connected with the reverse stock split |  |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |
Common Stock Issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fractional shares were issued in connected with the reverse stock split |  |  |  |  |  |  |  |  |  |  | 93 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  | 0.002 |  |  |  |  |  |  |  |  |  |  |
Reverse stock split |  |  |  | 1:500 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Registered Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of registered common stock offering |  |  |  |  |  | 212,000,000 |  |  |  |  |  |  |  |  |
Number of pre-funded warrants |  |  |  |  |  | 38,000,000 |  |  |  |  |  |  |  |  |
Number of pre-funded warrants to purchase shares of common stock |  |  |  |  |  | 38,000,000 |  |  |  |  |  |  |  |  |
Gross proceeds from sale of warrants | $ |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |
Offering price | $ / shares |  |  |  |  |  | $ 0.02 |  |  |  |  |  |  |  |  |
Number of common stock purchase warrant |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Number of shares to purchase upon common stock purchase warrant |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Purchase of common stock warrants, pre-funded warrants shall be paid at offering, per unit | $ / shares |  |  |  |  |  | $ 0.019 |  |  |  |  |  |  |  |  |
Purchase of common stock warrants, pre-funded warrants shall be paid upon exercise, per unit | $ / shares |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |
Warrants expiration period |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.02 |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  | 434,981,824 |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  | 434,981,824 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Rights Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of non-transferrable subscription rights | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock subscription rights | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subscriptions proceeds | $ | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issuable upon warrants exercised |  |  |  |  |  |  |  |  |  |  |  | 108,900,000 |  |  |
Subsequent Event [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of notes and warrants | $ |  |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Minimum [Member] | Securities Purchase Agreement [Member] | Hudson Bay [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claims for monetary damages | $ |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Maximum [Member] | Rights Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase aggregate of common stock | 28,571,429 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | OTCQB [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  | 0.0020 |  |  |  |  |  |  |  |  |  |  |
Reverse stock split |  |  |  | 1:500 |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |
Number of fractional shares were issued in connected with the reverse stock split |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series D Warrants [Member] | Registered Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants to purchase aggregate shares of common stock |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Common Stock Issued [Member] | Registered Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering share issued |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Warrants [Member] | Registered Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering share issued |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |

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