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Stockholders' Equity - Preferred Stock (Details) - USD ($) |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 28, 2017 | Nov. 02, 2017 | Jun. 16, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 27, 2017 | Jun. 15, 2016 | May 11, 2016 | May 10, 2016
Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 5,000,000 | 5,000,000 |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  | $ 0.001 | $ 0.001 |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 23,500 | 23,500 |  |  |  |
Series A convertible preferred stock, shares outstanding |  |  |  | 2,431 | 0 |  |  |  |
Number of shares callable by warrants (in shares) |  |  |  |  |  |  | 1 | 1,100,000 | 16,000,000
Warrant exercise price (in dollars per share) |  |  |  |  |  |  | $ 3.06 |  |
Common stock issued (in shares) | 10,000 |  | 6,704,852 |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |
Number of shares callable by warrants (in shares) |  |  |  | 1 |  |  |  |  |
Warrant exercise price (in dollars per share) | $ 0.3333 |  |  | $ 3.06 |  |  |  |  |
Period exercisable from the date of issuance |  |  |  | 30 months |  |  |  |  |
Common stock issued (in shares) | 10,000 |  | 6,704,852 | 12,237,079 | 8,673,253 |  |  |  |
Gross proceeds from private placement of stock |  |  | $ 15,300,000 |  |  |  |  |  |
Redemption price of warrant prior to expiration |  |  |  | $ 0.01 |  |  |  |  |
Common stock price per share for warrant redemption |  |  |  | $ 7.65 |  |  |  |  |
Number of consecutive trading days for warrant redemption |  |  |  | 10 days |  |  |  |  |
2017 Rights Offering [Member] |  |  |  |  |  |  |  |  |
Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |
Charge on Non Transferable Subscription Rights |  | $ 0 |  |  |  |  |  |  |
Number of shares callable by warrants (in shares) |  | 10,000 |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) |  | $ 0.3333 |  |  |  |  |  |  |
Period exercisable from the date of issuance |  |  |  | 30 months |  |  |  |  |
Common stock issued (in shares) | 10,000 |  |  |  |  |  |  |  |
Gross proceeds from private placement of stock | $ 8,800,000 |  |  |  |  |  |  |  |
Redemption price of warrant prior to expiration |  |  |  | $ 0.01 |  |  |  |  |
Common stock price per share for warrant redemption |  |  |  | $ 0.833 |  |  |  |  |
Number of consecutive trading days for warrant redemption |  |  |  | 10 days |  |  |  |  |
2017 Rights Offering [Member] | Warrant [Member] |  |  |  |  |  |  |  |  |
Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |
Number of shares callable by warrants (in shares) |  | 18 |  |  |  |  |  |  |
2017 Rights Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |
Number of shares callable by warrants (in shares) |  | 1 |  |  |  |  |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 13,500 | 13,500 |  |  |  |
Convertible preferred stock |  |  |  | 3.60% | 3.60% |  |  |  |
Series A convertible preferred stock, shares outstanding |  |  |  | 0 | 0 |  |  |  |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  | 10,000 |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  | $ 0.001 |  |  |
Number of shares callable by warrants (in shares) | 18,000,000 |  |  |  |  |  |  |  |
Common stock issued (in shares) | 30,000,000 |  |  |  |  |  |  |  |
Percentage of preferred stock converted to common stock |  |  |  | 75.00% |  |  |  |  |
Series B Convertible Preferred Stock [Member] | Dividend Paid [Member] |  |  |  |  |  |  |  |  |
Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |
Dividends payable |  |  |  | $ 4,000,000 |  |  |  |  |
Series B Convertible Preferred Stock [Member] | 2017 Rights Offering [Member] |  |  |  |  |  |  |  |  |
Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |
Number of shares callable by warrants (in shares) |  | 10,000 |  |  |  |  |  |  |

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