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Liquidity and Going Concern - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 25, 2018 | Oct. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Cash |  |  | $ 2,678,000 | $ 1,097,000 | $ 2,678,000 | $ 1,097,000 | $ 3,946,000 | $ 1,140,000
Working capital |  |  | 3,744,000 |  | 3,744,000 |  |  |
Debt |  |  | 0 |  | 0 |  | 1,563,000 |
Net loss |  |  | 1,689,000 | $ 590,000 | 2,974,000 | 1,258,000 |  |
Net cash used in operating activities |  |  |  |  | 689,000 | (29,000) |  |
Cash paid for interest payments on then-existing indebtedness |  |  |  |  | 318,000 | 542,000 |  |
Outstanding principal, debt obligations |  |  | $ 0 |  | 0 |  | $ 1,800,000 |
Issuance of preferred stock, net of expenses |  |  |  |  | 1,527,000 |  |  |
Principal payment made |  |  |  |  | 1,832,000 | $ 0 |  |
Western Alliance Bank |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Principal payment made |  |  |  |  | $ 800,000 |  |  |
Preferred Stock | Series C Preferred Stock |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Issuance of stock (in shares) | 1,750 |  |  |  | 1,750 |  |  |
Dividend rate, percentage | 0.00% |  |  |  |  |  |  |
Issuance of preferred stock, net of expenses | $ 1,527,000 |  |  |  |  |  |  |
Preferred Stock | Series B Preferred Stock |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  | 2,800 |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  | 0.00% |  |  |

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