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Redeemable Convertible Preferred Stock (Details) |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 20, 2016 shares | Jun. 03, 2016 USD ($) $ / shares | Apr. 08, 2016 USD ($) $ / shares shares | Apr. 07, 2016 USD ($) $ / shares | Jun. 13, 2013 $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Amount reclassified to Series B from APIC to adjust redemption value |  |  |  |  |  |  | $ (1,493,000) | $ (8,971,000)
Shares of common stock issued upon conversion of preferred stock | shares |  |  | 1,505,560 |  |  |  |  |
Exercise price of warrants | $ / shares |  |  |  |  |  | $ 5.87 | $ 5.87 | $ 8.19
Dividends payable |  |  |  |  |  | $ 953,000 | $ 953,000 |
Common Stock Issuance Agreement [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Trigger price per share for requirement to issue additional shares of common stock | $ / shares |  | $ 2.35 | $ 4.05 |  |  |  |  |
Shares issued per agreements | shares |  |  | 853,465 |  |  |  |  |
Exercise price of warrants | $ / shares |  |  | $ 4.05 | $ 7.00 |  |  |  |
Cash payments in respect of accrued dividends |  |  | $ 2,200,000 |  |  |  |  |
Warrant expiration date |  |  | Mar. 31, 2021 | Jun. 26, 2018 |  |  |  |
Gross proceeds benchmark for expiration of obligation to issue shares |  |  |  |  |  | $ 10,000,000 |  |
Future shares of common stock approved to be issued per agreement | shares | 1,037,053 |  |  |  |  | 286,846 |  |
Derivative liability |  |  | $ 2,300,000 |  |  |  |  |
Liability fair value adjustment |  | $ 1,500,000 |  |  |  |  |  |
Gain (loss) on remeasurement of conversion feature |  | $ 1,500,000 |  |  |  |  |  |
Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Exercise price of warrants | $ / shares |  | $ 2.25 |  |  |  |  |  |
Combined per share purchase price of shares and warrants issued | $ / shares |  | $ 2.35 |  |  |  |  |  |
Proceeds from issuance of common stock and warrants |  | $ 5,000,000 |  |  |  |  |  |
Dilutive Financing Derivative Liability [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Creation of dilutive financing derivative |  |  |  |  |  |  | 2,282,000 |
Derivative liability |  |  |  |  |  | $ 382,000 | 382,000 |
Liability fair value adjustment |  |  |  |  |  |  | (355,000) |
Gain (loss) on remeasurement of conversion feature |  |  |  |  |  |  | (355,000) |
Change in fair value of derivative liabilities |  |  |  |  |  | $ 988,000 | $ 355,000 |
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 |  |  |
Number of shares of common stock for which each Series B share can be converted |  |  |  | 0.20 |  |  |  |
Preferred Stock dividend rate |  |  |  |  | 10.00% |  |  |
Trigger price per share for redemption and conversion features of derivative | $ / shares |  |  |  |  | $ 7.00 |  |  |
Amount reclassified to Series B from APIC to adjust redemption value |  |  |  | $ 1,868,000 |  |  |  |
Number of shares converted | shares |  |  | 7,527,853 |  |  |  |  |

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