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Stockholders' Equity - Stock and Warrant Issuances - Additional Information (Detail) |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
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Oct. 11, 2017 shares | Oct. 10, 2017 shares | Apr. 02, 2017 USD ($) | Nov. 30, 2016 USD ($) Investor shares | Oct. 31, 2016 USD ($) shares | Jun. 30, 2016 USD ($) shares | Jul. 31, 2015 USD ($) shares | Feb. 28, 2015 USD ($) shares | Oct. 31, 2013 USD ($) shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) Investor $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Nov. 30, 2017 USD ($) | Jun. 06, 2016 USD ($) shares | Oct. 20, 2015 USD ($) | Dec. 31, 2014 $ / shares shares
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of expenses (in shares) |  |  |  |  | 2 |  | 3,000,000 | 1 | 1 | 424,000 |  |  |  |  |  |  |  |
Proceeds from issuance of private placement | $ |  |  |  |  | $ 1,200,000 |  |  | $ 2,600,000 | $ 7,500,000 |  |  |  |  |  |  |  |  |
Net proceeds from issuance of private placement | $ |  |  |  |  | $ 1,100,000 |  |  | $ 2,500,000 | $ 6,900,000 | $ 4,300,000 |  |  |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 14,049 | 78 | 44 |  |  |  | 9
Sale of units to underwriter |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds of common stock issued, net of related expenses | $ |  |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Number of pre-funded warrants |  |  |  |  |  |  |  |  |  | 76,000 |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 19,712,000 | $ 19,712,000 | $ 19,712,000 |  |  |  | $ 19,712,000
Maximum offering and selling of stock and securities that entity make to raise capital | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 71,800,000 |
Common Stock Issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of expenses (in shares) |  |  |  |  |  |  |  |  |  | 668,854 |  |  | 2 | 4 |  |  |  |
Common shares and rights issued |  |  |  |  |  |  |  |  |  |  |  | 227,287 | 10 |  |  |  |  |
Amendment to Restructuring Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued to purchase Common Stock | 127,551 | 225 |  |  |  |  |  |  |  |  |  | 255 |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 61,250 |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |
Warrants term |  |  |  |  |  |  |  |  |  |  |  | 4 years 6 months |  |  |  |  |  |
Warrants exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Number of investors | Investor |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Shares issuable upon warrants exercised |  |  |  |  |  |  |  |  |  |  |  | 735 |  |  |  |  |  |
Warrants exercise price description |  |  |  |  |  |  |  |  |  |  |  | The warrants contain a cashless exercise provision that allows the holders to exercise each warrant for three shares of common stock. |  |  |  |  |  |
Securities Purchase Agreement [Member] | Common Stock Issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares and rights issued |  |  |  |  |  |  |  |  |  |  |  | 224,000 |  |  |  |  |  |
Securities Purchase Agreement [Member] | Warrant Repurchase Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount to be paid in exchange for cancellation of warrants | $ |  |  | $ 7,900,000 |  |  | $ 7,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,000,000 |  |
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] | Common Stock Issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares and rights issued |  |  |  |  |  |  |  |  |  |  |  | 217,800 |  |  |  |  |  |
Series A Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 24,500 |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |  |  |  |  |  |
Number of warrants converted |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from underwriting offering | $ |  |  |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |
Warrants exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Net proceeds from exercise of warrants | $ |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |
Series A And B Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of warrants issued | $ |  |  |  |  |  |  | $ 3,400,000 |  |  |  |  |  |  |  |  |  |  |
Series B Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |
Net proceeds from exercise of warrants | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000 |  |  |  |  |
Remaining outstanding warrants expired |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |
Warrants expiration date |  |  |  |  |  |  |  |  |  |  |  | Jan. 29, 2016 |  |  |  |  |  |
Expected Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants term |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Expected Life [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants term |  |  |  |  |  |  |  |  |  | 6 years 4 months 24 days |  | 4 years 10 months 17 days |  |  |  |  |  |
'Expected Volatility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants measurement input |  |  |  |  |  |  |  |  |  | 1.9410 |  |  |  |  |  |  |  |
'Expected Volatility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants measurement input |  |  |  |  |  |  |  |  |  | 3.7200 |  | 2.6692 |  |  |  |  |  |
Risk-free Interest Rates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants measurement input |  |  |  |  |  |  |  |  |  | 0.0278 |  |  |  |  |  |  |  |
Risk-free Interest Rates [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants measurement input |  |  |  |  |  |  |  |  |  | 0.0292 |  | 0.0206 |  |  |  |  |  |
February 2018 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued to purchase Common Stock |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |
Value of warrants issued | $ |  |  |  |  |  |  |  |  |  | $ 18,300,000 |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 10.00 |  |  |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |
February 2018 Warrants [Member] | Exercise Price [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants measurement input | $ / shares |  |  |  |  |  |  |  |  |  | 10.00 |  |  |  |  |  |  |  |
February 2018 Warrants [Member] | Expected Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants term |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |
February 2018 Warrants [Member] | 'Expected Volatility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants measurement input |  |  |  |  |  |  |  |  |  | 1.2268 |  |  |  |  |  |  |  |
February 2018 Warrants [Member] | Risk-free Interest Rates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants measurement input |  |  |  |  |  |  |  |  |  | 0.01 |  |  |  |  |  |  |  |
2013 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued to purchase Common Stock |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |
Value of warrants issued | $ |  |  |  |  |  |  |  |  | $ 1,900,000 |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 19,712,000 |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |
Warrants term |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
February 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued to purchase Common Stock |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |
Value of warrants issued | $ |  |  |  |  |  |  |  | $ 800,000 |  |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 24,500 |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |
Warrants term |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Series C Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount to be paid in exchange for cancellation of warrants | $ |  |  |  |  |  |  |  |  |  | $ 0 | $ 7,876,000 | $ 7,876,000 | $ 0 | $ 0 |  |  |  |
Series C Warrants [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of warrants issued | $ |  |  |  |  |  | 27,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Series C Warrants [Member] | Securities Purchase Agreement [Member] | Warrant Repurchase Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount to be paid in exchange for cancellation of warrants | $ |  |  |  |  |  | 7,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Series C Warrants [Member] | Senior Secured Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal face amount | $ |  |  |  |  |  | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Series C Warrants [Member] | Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants converted |  |  |  |  |  | 40 |  |  |  |  |  |  |  |  |  |  |  |
Shares issuable upon warrants exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |
October 2016 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued to purchase Common Stock |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Value of warrants issued | $ |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 24,500 |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Warrants term |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Net proceeds from exercise of warrants | $ |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |
November 2017 Warrants [Member] | Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued to purchase Common Stock |  |  |  | 14,049 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of warrants issued | $ |  |  |  | $ 14,400,000 |  |  |  |  |  |  |  |  |  |  | $ 14,400,000 |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 1,225 |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 14,049 |  |  |  |  |  |
Warrants term |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Number of investors | Investor |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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