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Stockholders' Equity (Details Textual) | 1 Months Ended | 6 Months Ended | 13 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) plan $ / shares shares | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) $ / shares shares | May 13, 2016 shares
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |
Maximum authorized amount | $ | $ 50,000,000.0 |  |  |  |
Agent fee | 2.00% |  |  |  |
Stock issued during period (shares) |  | 2,917,725 |  | 3,576,473 |
Offering price ($ per share) | $ / shares |  | $ 8.41 |  | $ 8.41 |
Proceeds | $ |  | $ 24,060,196 | $ 1,301,435 | $ 30,400,000 |
Remaining authorized amount | $ |  | $ 19,000,000 |  | $ 19,000,000 |
Number of plans | plan |  | 1 |  |  |
Award vesting period |  | 3 years |  |  |
Maximum contractual term |  | 10 years |  |  |
VGX Equity Compensation Plan [Member] |  |  |  |  |
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |
Options outstanding (shares) |  | 348,069 |  | 348,069 |
2016 Incentive Plan |  |  |  |  |
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |
Number of shares authorized (shares) |  | 6,000,000 |  | 6,000,000 | 6,000,000
Number of potential shares authorized for issuance under share based compensation plan (shares) |  |  |  |  | 2,000,000
Number of shares available for grant (shares) |  | 4,074,919 |  | 4,074,919 |
Number of shares of unvested restricted stock units and options outstanding (shares) |  | 858,915 |  | 858,915 |
Common stock, other shares, outstanding (shares) |  | 1,063,916 |  | 1,063,916 |
Stock and Cash Based Incentive Plan [Member] |  |  |  |  |
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |
Common stock, other shares, outstanding (shares) |  | 6,476,778 |  | 6,476,778 |
Number of shares of unvested restricted stock units (shares) |  | 476,829 |  |  |

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