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Liquidity and Going Concern - Narrative (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 24, 2017 USD ($) shares | Jul. 31, 2017 USD ($) | Nov. 13, 2017 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) offering shares | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) offering shares | Sep. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | $ 1,439 | $ 1,343 | $ 1,439 | $ 1,343 |  | $ 1,140 | $ 1,764
Working capital |  |  |  |  | 696 |  | 696 |  |  |  |
Restricted cash |  |  |  |  | 18 |  | 18 |  |  | $ 18 |
Net income |  |  |  |  | $ 7,104 | $ (1,705) | 5,846 | (3,021) |  |  |
Net cash provided by operating activities |  |  |  |  |  |  | 1,073 | 265 |  |  |
Cash paid during the period for interest payments on indebtedness |  |  |  |  |  |  | 777 | 841 |  |  |
Extinguishment of debt and accrued interest |  | $ 9,362 |  |  |  |  |  |  |  |  |
Principal payment made |  |  |  |  |  |  | $ 341 | $ 400 |  |  |
Registered direct offering, convertible, shares issued (in shares) | shares |  |  |  |  | 32 |  | 32 |  |  | 32 |
Number of possible future equity offerings (or more) | offering |  |  |  |  | 1 |  | 1 |  |  |  |
Series B-1 Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Registered direct offering, convertible, shares issued (in shares) | shares |  |  |  |  | 0 |  | 0 |  |  |  |
Subsequent Event | Series B-1 Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Registered direct offering, convertible, shares issued (in shares) | shares | 2,800 |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of stock | $ 2,800 |  |  |  |  |  |  |  |  |  |
Estimated net proceeds from issuance of stock | $ 2,325 |  |  |  |  |  |  |  |  |  |
Western Alliance Bank | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal payment made |  |  | $ 200 |  |  |  |  |  |  |  |
Super G Capital |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash paid during the period for interest payments on indebtedness |  |  |  |  | $ 46 |  |  |  |  |  |
Principal payment made |  |  |  |  | $ 4 |  |  |  |  |  |
Required principal and interest payments |  | $ 1,540 |  |  |  |  |  |  |  |  |
Scenario, Forecast | Western Alliance Bank |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Required principal payments |  |  |  |  |  |  |  |  | $ 400 |  |
Scenario, Forecast | Super G Capital |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Required principal and interest payments |  |  |  | $ 152 |  |  |  |  | $ 823 |  |

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