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Redeemable Convertible Preferred Stock (Details) |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 22, 2016 USD ($) $ / shares | Jun. 03, 2016 USD ($) $ / shares | Apr. 08, 2016 USD ($) $ / shares shares | Apr. 07, 2016 USD ($) $ / shares shares | Aug. 03, 2015 shares | Jun. 13, 2013 $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Jun. 20, 2016 shares | Aug. 02, 2015 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares | $ 0.75 |  |  |  |  |  | $ 2.29 | $ 8.19 |  |
Remaining shares authorized for issuance | shares |  |  |  |  | 670,000,000 |  | 670,000,000 | 670,000,000 |  | 445,000,000
Dividends payable |  |  |  |  |  |  | $ 38,000 |  |  |
Combined per share purchase price of common stock and warrants issued | $ / shares |  | $ 2.35 |  |  |  |  |  |  |  |
Proceeds from equity offerings, gross | $ 4,000,000 | $ 5,000,000 |  |  |  |  |  |  |  |
Shares of common stock issued upon conversion of preferred stock | shares |  |  | 1,505,560 |  |  |  |  |  |  |
Preferred B stock conversion liability |  |  |  |  |  |  |  | $ 1,493,000 |  |
Amount reclassified to Series B redeemable convertible stock |  |  |  |  |  |  | (1,493,000) | (8,971,000) |  |
Reverse stock split, description |  |  |  |  | 1-for-50 (1:50) reverse stock split of its common stock, par value $0.01 per share |  |  |  |  |
Conversion ratio of reverse stock split |  |  |  |  | 50 |  |  |  |  |
Dilutive Financing Derivative Liability [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative liability |  |  |  |  |  |  | 126,000 |  |  |
Changes in estimated fair value |  |  |  |  |  |  | $ (611,000) |  |  |
Common Stock Issuance Agreement [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued per agreement | shares |  |  | 853,465 |  |  |  |  |  |  |
Exercise price of warrants | $ / shares |  |  | $ 4.05 | $ 7.00 |  |  |  |  |  |
Warrant expiration date |  |  | March 31, 2021 | June 26, 2018 |  |  |  |  |  |
Cash payments in respect of accrued dividends |  |  | $ 2,200,000 |  |  |  |  |  |  |
Trigger price per share for requirement to issue additional shares of common stock | $ / shares |  |  | $ 4.05 |  |  |  |  |  |  |
Limitation rate for obligation to issue additional shares |  |  |  |  |  |  | 19.99% |  |  |
Remaining shares authorized for issuance | shares |  |  |  |  |  |  | 286,846 |  | 1,037,053 |
Minimum proceeds from conversion of stock upon closing of offering |  |  |  |  |  |  | $ 10,000,000 |  |  |
Common Stock Issuance Agreement [Member] | Dilutive Financing Derivative Liability [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative liability |  |  | $ 2,300,000 |  |  |  |  |  |  |
Changes in estimated fair value |  | $ 1,500,000 |  |  |  |  | $ 611,000 |  |  |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized | shares |  |  |  |  |  | 9,357,935 |  |  |  |
Preferred Stock, initial stated value per share | $ / shares |  |  |  |  |  | $ 1.40 |  |  |  |
Preferred Stock, par value per share | $ / shares |  |  |  |  |  | $ 0.01 |  |  |  |
Preferred stock, shares outstanding | shares |  |  |  | 7,527,853 |  |  |  |  |  |
Number of common stock shares into which each share of preferred stock can be converted |  |  |  | 0.20 |  |  |  |  |  |
Preferred Stock dividend rate |  |  |  |  |  | 10.00% |  |  |  |
Preferred Stock, liquidation preference per share | $ / shares |  |  |  |  |  |  | $ 1.40 |  |  |
Trigger price per share for redemption and conversion features of embedded derivative | $ / shares |  |  |  |  |  | $ 7.00 |  |  |  |
Amount reclassified to Series B redeemable convertible stock |  |  |  | $ 1,858,000 |  |  |  |  |  |

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