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Stockholders' Equity - Common Stock (Details) - USD ($) |  |  |  |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 25, 2018 | Jun. 01, 2018 | Nov. 28, 2017 | May 31, 2017 | Apr. 11, 2017 | Dec. 22, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | May 23, 2018 | Dec. 31, 2017
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | 6,723 |  | 10,000 |  |  |  |  |  |  |
Proceeds from sale of common stock, net |  |  |  |  |  |  | $ (200,000) | $ 11,225,000 |  |
Common stock, par value (in dollars per share) |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 | $ 0.001
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | 6,723 |  | 10,000 |  |  |  |  |  |  |
Share issued, price per share |  |  |  |  | $ 11.00 |  |  |  |  |
Common Stock [Member] | Maxim Group LLC [Member] |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  |  |  | 84,900 | 900,000 |  |  |  |  |
Proceeds from sale of common stock, net |  |  |  | $ 800,000 | $ 8,700,000 |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  | $ 0.001 |  |  |  |  |
Share issued, price per share |  |  |  | $ 11.00 | $ 10.40 |  |  |  |  |
Closing of offering date |  |  |  |  | Apr. 17, 2017 |  |  |  |  |
Number of days granted as option to purchase additional shares of common stock to underwriter |  |  |  |  | 45 days |  |  |  |  |
Additional shares of common stock |  |  |  |  | 94,400 |  |  |  |  |
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock issued, value |  |  |  |  |  | $ 20,000,000 |  |  |  |
Period exercisable from the date of issuance |  |  |  |  |  | 30 months |  |  |  |
Common Stock [Member] | Lincoln Park Capital Fund, LLC [Member] | Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock issued, value |  |  |  |  |  | $ 200,000 |  |  |  |
Common stock issued (in shares) |  |  |  |  |  | 199,472 |  |  |  |
Proceeds from sale of common stock, net |  |  |  |  |  | $ 1,700,000 |  |  |  |
Common Stock [Member] | B. Riley FBR [Member] | Sales Agreement [Member] | ATM Program [Member] |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.001 |  |  |  |  |  |  |  |
Common Stock [Member] | Securities Purchase Agreement [Member] | Lincoln Park Capital Fund, LLC [Member] |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  |  |  |  |  | 12,742 |  |  |  |
Trading Volume of Common Shares |  |  |  |  |  | 0 |  |  |  |
Common stock issued (in shares) |  |  |  |  |  | 38,226 |  |  |  |
Common Stock [Member] | Maximum [Member] | Lincoln Park Capital Fund, LLC [Member] | Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Floor price of per share |  |  |  |  |  | $ 5.00 |  |  |  |
Common Stock [Member] | Maximum [Member] | B. Riley FBR [Member] | Sales Agreement [Member] | ATM Program [Member] |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock, net |  | $ 6,500,000 |  |  |  |  |  |  |  |
Common Stock [Member] | Maximum [Member] | Single Regular Purchase [Member] | Lincoln Park Capital Fund, LLC [Member] |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  |  |  |  |  | 10,000 |  |  |  |
Common Stock [Member] | Minimum [Member] | Lincoln Park Capital Fund, LLC [Member] |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Beneficial ownership percentage of common stock outstanding |  |  |  |  |  | 9.99% |  |  |  |
Common Stock [Member] | Minimum [Member] | Single Regular Purchase [Member] | Lincoln Park Capital Fund, LLC [Member] |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock issued, value |  |  |  |  |  | $ 1,000,000 |  |  |  |

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