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Nature of Business and Operations (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2017 | Mar. 31, 2017 | Aug. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Nature of the Business and Operations (Textual) |  |  |  |  |  |
Net loss (including noncontrolling interests) |  |  |  | $ (4,705,000) | $ (5,291,000) | $ (7,820,000)
Accumulated deficit |  |  |  | (183,745,000) | (179,040,000) |
Net cash used in operating activities |  |  |  | (5,581,000) | (6,252,000) | (8,063,000)
Net proceeds from issuance of common stock |  |  |  | $ 9,079,000 | $ 7,913,000 | $ 5,422,000
Shelf registration statement, expire date |  | Mar. 24, 2020 |  |  |  |
Aggregate of common stock offering price |  | $ 20,000,000 |  |  |  |
Employee Investor Shares [Member] |  |  |  |  |  |
Nature of the Business and Operations (Textual) |  |  |  |  |  |
Issuance of common stock |  |  | 427,352 |  |  |
Net proceeds from issuance of common stock |  |  | $ 500,000 |  |  |
Shares price per share |  |  | $ 1.17 |  |  |
Outside Investor Shares [Member] |  |  |  |  |  |
Nature of the Business and Operations (Textual) |  |  |  |  |  |
Issuance of common stock |  |  | 4,600,000 |  |  |
Net proceeds from issuance of common stock |  |  | $ 4,600,000 |  |  |
Shares price per share |  |  | $ 1.00 |  |  |
Securities Purchase Agreement [Member] |  |  |  |  |  |
Nature of the Business and Operations (Textual) |  |  |  |  |  |
Issuance of common stock | 9,750,000 |  | 8,627,352 |  |  |
Net proceeds from issuance of common stock | $ 9,100,000 |  | $ 7,900,000 |  |  |
Shares price per share | $ 1.00 |  |  |  |  |
Warrant issued to purchase shares of common stock | 3,250,001 |  |  |  |  |
Description of securities purchase agreement | The 2017 Warrants will become exercisable on August 8, 2018, and will expire on August 8, 2020. |  | (iii) up to 3,600,000 shares issuable upon exercise of warrants (the "Pre-Funded Warrants") by outside investors for which we received $3,564,000 pre-funded in proceeds and will receive up to $36,000 in proceeds upon future cash exercises. | The 2017 Warrants will become exercisable on August 8, 2018, and will expire on August 8, 2020. |  |
Shelf registration statement, expire date |  |  |  |  | Feb. 17, 2022 |
Warrants expiration, date |  |  | Feb. 17, 2022 |  |  |
Proceeds from issuance of warrants | $ 9,750,000 |  | $ 4,800,000 | $ 6,500,000 |  |
Securities Purchase Agreement [Member] | Investor [Member] |  |  |  |  |  |
Nature of the Business and Operations (Textual) |  |  |  |  |  |
Proceeds from issuance of warrants | 6,500,000 |  |  |  |  |
Purchase Warrants [Member] |  |  |  |  |  |
Nature of the Business and Operations (Textual) |  |  |  |  |  |
Issuance of common stock |  |  | 4,313,676 |  |  |
Shares price per share |  |  | $ 1.12 |  |  |
Proceeds from issuance of warrants | $ 11,300,000 |  | $ 11,300,000 |  |  |

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