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Preferred Stock - Narrative (Details) |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 25, 2018 USD ($) $ / shares shares | Oct. 31, 2017 USD ($) member $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) $ / shares shares
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, convertible, shares authorized (in shares) |  |  | 5,000,000 |  |
Beneficial conversion amount | $ |  |  | $ 24,000 |  |
Accrued dividends | $ |  |  | 65,000 |  | $ 59,000
Proceeds from issuance of preferred stock gross | $ |  |  | 1,527,000 | $ 0 |
Issuance of stock | $ |  |  | $ 1,527,000 |  |
Conversion price below this fair value of the common stock (in dollars per share) | $ / shares |  |  | $ 1.16 |  |
Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock issued for conversion of convertible preferred stock, shares (in shares) |  |  | (1,851,000) |  |
Perpetual Series B-1 Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, convertible, shares authorized (in shares) |  |  | 100 |  |
Preferred stock, shares issued (in shares) |  |  | 0 |  |
Preferred stock, shares outstanding (in shares) |  |  | 0 |  |
Series A-2 Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, convertible, shares authorized (in shares) |  |  | 7,500 |  | 7,500
Preferred stock, shares issued (in shares) |  |  | 32 |  | 32
Preferred stock, stated value | $ |  |  | $ 7,500 |  | $ 7,500
Preferred stock, shares outstanding (in shares) |  |  | 32 |  | 32
Stated value (in dollars per share) | $ / shares |  |  | $ 0.0001 |  | $ 0.0001
Stock issued during period, conversion of convertible securities, price (in dollars per share) | $ / shares |  |  | $ 2.16 |  | $ 2.40
Convertible preferred stock, shares issued upon conversion (in shares) |  |  | 3,472 |  |
Preferred stock, cumulative dividend percentage rate, per annum |  |  | 5.00% |  |
Redemption price per share (in dollars per share) | $ / shares |  |  | $ 8,250 |  |
Redemption price per share, multiplier (in dollars per share) | $ / shares |  |  | $ 7,500 |  |
Redemption price per share, multiplier, percentage |  |  | 110.00% |  |
Derivative liability | $ |  |  | $ 0 |  |
Series A-2 Preferred Stock | Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock issued for conversion of convertible preferred stock, shares (in shares) |  |  | 0 |  |
Series B Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, convertible, shares authorized (in shares) |  |  | 2,800 |  | 2,800
Preferred stock, shares issued (in shares) |  |  | 375 |  | 450
Preferred stock, stated value | $ |  |  | $ 1,000 |  | $ 1,000
Preferred stock, shares outstanding (in shares) |  |  | 375 |  | 450
Stated value (in dollars per share) | $ / shares |  | $ 1,000 | $ 0.0001 |  | $ 0.0001
Stock issued during period, conversion of convertible securities, price (in dollars per share) | $ / shares |  | $ 0.28 |  |  |
Proceeds from issuance of preferred stock gross | $ |  | $ 2,800,000 |  |  |
Participation rights, future offerings, max percentage |  | 100.00% |  |  |
Expansion of board of director members | member |  | 6 |  |  |
Minimum number of shares outstanding and unconverted (in shares) |  | 333 |  |  |
Series B Preferred Stock | Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, cumulative dividend percentage rate, per annum |  |  | 0.00% |  |
Issuance of stock (in shares) |  | 2,800 |  |  |
Stock issued for conversion of convertible preferred stock, shares (in shares) |  |  | 75 |  |
Series B Preferred Stock | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock issued for conversion of convertible preferred stock, shares (in shares) |  |  | (268,000) |  |
Series C Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, convertible, shares authorized (in shares) |  |  | 1,750 |  | 1,750
Preferred stock, shares issued (in shares) |  |  | 1,275 |  | 0
Preferred stock, stated value | $ |  |  | $ 1,000 |  | $ 1,000
Preferred stock, shares outstanding (in shares) |  |  | 1,275 |  | 0
Stated value (in dollars per share) | $ / shares | $ 1,000 |  | $ 0.0001 |  | $ 0.0001
Stock issued during period, conversion of convertible securities, price (in dollars per share) | $ / shares | $ 0.30 |  |  |  |
Proceeds from issuance of preferred stock gross | $ | $ 1,750,000 |  |  |  |
Participation rights, future offerings, max percentage | 100.00% |  |  |  |
Participation rights, future offerings, limitation on stated value outstanding | $ | $ 500,000 |  |  |  |
Series C Preferred Stock | Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, cumulative dividend percentage rate, per annum | 0.00% |  |  |  |
Issuance of stock (in shares) | 1,750 |  | 1,750 |  |
Stock issued for conversion of convertible preferred stock, shares (in shares) |  |  | 475 |  |
Issuance of stock | $ | $ 1,527,000 |  |  |  |
Series C Preferred Stock | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock issued for conversion of convertible preferred stock, shares (in shares) |  |  | (1,583,000) |  |
Series D Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, convertible, shares authorized (in shares) |  |  | 4,000 |  |
Preferred stock, shares issued (in shares) |  |  | 0 |  |
Preferred stock, shares outstanding (in shares) |  |  | 0 |  |
Perpetual Series B Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, convertible, shares authorized (in shares) |  |  | 100 |  |
Preferred stock, shares issued (in shares) |  |  | 0 |  |

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