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Stockholders' Equity - Preferred Stock Issuances - Additional Information (Detail) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
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Sep. 21, 2017 USD ($) Investor Vote $ / shares shares | Aug. 28, 2017 USD ($) shares | Aug. 04, 2017 USD ($) | Jul. 11, 2017 USD ($) Vote $ / shares | Jul. 07, 2017 USD ($) | Jul. 02, 2017 USD ($) Vote $ / shares shares | May 09, 2017 USD ($) | Apr. 10, 2017 USD ($) | Mar. 13, 2017 USD ($) | Mar. 02, 2017 USD ($) | Feb. 10, 2017 USD ($) | Feb. 01, 2017 USD ($) | Jan. 12, 2017 USD ($) | Oct. 31, 2016 USD ($) | Feb. 28, 2015 USD ($) | Oct. 31, 2013 USD ($) | Jun. 30, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) $ / shares | Dec. 28, 2017 USD ($) | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) | Nov. 06, 2017 USD ($) | Sep. 12, 2017 $ / shares | Jun. 29, 2017 $ / shares
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 |  | $ 0.01 |  |  |  |
Conversion of convertible notes |  |  | $ 1,015,848 |  | $ 2,000,000 |  | $ 1,913,915 | $ 3,621,286 | $ 4,417,829 | $ 125,999 | $ 3,045,817 | $ 544,000 | $ 1,478,318 |  |  |  | $ 0 |  | $ 15,831,000 | $ 40,121,000 | $ 35,000,000 | $ 649,000 | $ 0 |  |  |
Sale of stock in private placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,210,000 |  |  |  |  | 1,011,000 | 8,479,000 |  |  |
Gross proceeds from the sale of shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 | $ 2,600,000 | $ 7,500,000 |  |  |  |  |  |  |  |  |  |
Deemed dividend amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 527,000 |  | $ 0 | $ 0 |  |  |
Restructuring Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01
Number of Shares | shares |  |  |  |  |  | 4,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing bid price | $ / shares |  |  |  |  |  | $ 644,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes | Vote |  |  |  |  |  | 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption price per share | $ / shares |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock [Member] | Senior Secured Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes |  |  |  |  |  | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01
Closing bid price | $ / shares |  |  |  | $ 32,787 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes | Vote |  |  |  | 61 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock in private placement |  |  |  | $ 2,360,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price in private placement |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from the sale of shares |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  |  | $ 26,775 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deemed dividend amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 360,000 |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] | Restructuring Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemed share | shares |  | 2,360,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series C Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |
Number of Shares | shares | 590 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes | Vote | 2,968 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption price per share | $ / shares | $ 1,000.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of investors | Investor | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 590,000 |  |

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