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Stockholders' Equity (Detail Textuals) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2017 | Jul. 21, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Subsequent Event [Line Items] |  |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 0.001 | $ 0.001
Proceeds from issuance of common stock |  |  | $ 14,749,000 | $ 6,794,000
Common Stock |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of shares issued upon conversion |  |  | 132,000 |
Number of common stock issued |  |  | 3,154,000 |
Series A Preferred Stock |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of shares issued upon conversion |  |  | 8,608 |
Price per share used to determine number of shares of common stock | $ 1,000 |  |  |
Underwritten Public Offering | Ladenburg Thalmann & Co. Inc. |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Proceeds from issuance of common stock |  | $ 13,700,000 |  |
Underwritten Public Offering | Ladenburg Thalmann & Co. Inc. | Series A Preferred Stock |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Aggregate intrinsic value of stock |  | $ 3,638,000 |  |
Underwritten Public Offering | Ladenburg Thalmann & Co. Inc. | Class A Units |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Share price per unit (in dollars per share) |  | $ 2 |  |
Number of units authorized for issuance and sale |  | 3,154,000 |  |
Underwritten Public Offering | Ladenburg Thalmann & Co. Inc. | Class A Units | Common Stock |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of securities called by each unit |  | 1 |  |
Number of securities called by each warrant |  | 1 |  |
Underwritten Public Offering | Ladenburg Thalmann & Co. Inc. | Class B Units |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Share price per unit (in dollars per share) |  | $ 1,000 |  |
Number of units authorized for issuance and sale |  | 8,872 |  |
Underwritten Public Offering | Ladenburg Thalmann & Co. Inc. | Class B Units | Common Stock |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of shares issued upon conversion |  | 500 |  |
Price per share used to determine number of shares of common stock |  | $ 1,000.00 |  |
Underwritten Public Offering | Ladenburg Thalmann & Co. Inc. | Class B Units | Series A Preferred Stock |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of securities called by each unit |  | 1 |  |
Preferred stock, par value (in dollars per share) |  | $ 0.001 |  |

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