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Equity Financings and Warrants (Details Textual) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Aug. 21, 2017 | Jan. 11, 2017 | Dec. 31, 2016
Equity Financing And Warrants [Line Items] |  |  |  |
Common stock, par value | $ 0.001 |  |  | $ 0.001
Common stock, shares issued | 11,775,062 |  |  | 9,082,366
Proceeds from the issuance of common stock | $ 6,551,000 |  |  |
JonesTrading |  |  |  |
Equity Financing And Warrants [Line Items] |  |  |  |
Percentage of selling commission per additional shares sold |  |  | 3.00% |
Sales Agreement |  |  |  |
Equity Financing And Warrants [Line Items] |  |  |  |
Common stock, shares issued | 2,677,525 |  |  |
Proceeds from the issuance of common stock | $ 6,600,000 |  |  |
Net proceeds from issuance of common stock | $ 6,100,000 |  |  |
Sales Agreement | JonesTrading |  |  |  |
Equity Financing And Warrants [Line Items] |  |  |  |
Common stock, par value |  |  | $ 0.001 |
Aggregate offering price of common stock authorized |  | $ 10,200,000 | $ 7,300,000 |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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