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Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 04, 2018 USD ($) $ / shares shares | Nov. 10, 2010 Item $ / shares shares | Oct. 31, 2018 USD ($) | Jul. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2017 $ / shares | Feb. 28, 2017 $ / shares
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Shares of common stock issued |  |  |  | 1,325,000 |  |  |
Net proceeds from issuance of common stock | $ |  |  |  | $ 1,987,000 |  |  |
Sale of Stock, Price Per Share | $ / shares |  |  |  | $ 1.70 |  |  |
Warrants available to purchase |  |  |  | 662,500 |  |  |
Exercise price of warrants | $ / shares | $ 0.30 | $ 4.80 |  | $ 2.35 |  |  |
Warrants expiration date |  |  |  |  | Jan. 06, 2023 |  |
Gross proceeds from units offering | $ | $ 11,100 |  |  |  |  |  |
Units offered during the period | 36,910,809 |  |  |  |  |  |
Common stock warrants expiration date |  |  |  |  | Oct. 04, 2023 |  |
Number of shares of common stock included in each common unit | 1 |  |  |  |  |  |
Number of warrant to purchase share of common included in each common unit | 1 |  |  |  |  |  |
Number of common stock warrant included in each pre-funded unit | 1 |  |  |  |  |  |
Number of warrant to purchase share of common stock included in each pre-funded unit | 1 |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |  |  | $ 0.001 | $ 0.001 | $ 0.001
Number of preferred share purchase rights declared as dividend for each outstanding share of common stock | Item |  | 1 |  |  |  |  |
Number of shares of Series AA Preferred Stock that a registered holder of right is entitled to purchase |  | 0.001 |  |  |  |  |
Percentage of the company's common stock acquired by a third party upon which the rights become exercisable |  | 15.00% |  |  |  |  |
Minimum percentage of the company's common stock that must receive a tender offer from a third party upon which the rights become exercisable |  | 15.00% |  |  |  |  |
Common Stock Warrants |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Beneficial ownership maximum percentage of outstanding common stock | 9.99% |  |  |  |  |  |
Exercise price per share minimum | $ / shares | $ 0.12 |  |  |  |  |  |
Warrants outstanding |  |  |  |  | 36,910,809 |  |
Warrants exercisable |  |  |  |  | 36,910,809 |  |
Senior Secured Convertible Notes due August 15 2018 |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Payment on principle amount of note | $ | $ 7,400 |  | $ 7,400 |  |  |  |
Common Units |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Units offered during the period | 8,065,000 |  |  |  |  |  |
Units offered during the period, price per unit | $ / shares | $ 0.30 |  |  |  |  |  |
Pre-funded Units |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Units offered during the period | 28,845,809 |  |  |  |  |  |
Units offered during the period, price per unit | $ / shares | $ 0.30 |  |  |  |  |  |
Warrants outstanding |  |  |  |  | 2,310,776 |  |
Warrants exercisable |  |  |  |  | 2,310,776 |  |

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