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Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Jul. 25, 2017 | Jun. 30, 2016 | Mar. 31, 2018 | May 13, 2016
Class of Stock [Line Items] |  |  |  |  |
Award vesting period |  |  |  | 3 years |
Maximum contractual term |  |  |  | 10 years |
VGX Equity Compensation Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Options outstanding (shares) |  |  |  | 191,438 |
Stock and Cash Based Incentive Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, other shares, outstanding (shares) |  |  |  | 6,197,484 |
Award vesting period |  |  |  | 3 years |
Maximum contractual term |  |  |  | 10 years |
Number of shares of unvested restricted stock units (shares) |  |  |  | 215,662 |
2016 Incentive Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares authorized (shares) |  |  |  | 8,000,000 | 6,000,000
Number of potential shares authorized for issuance under share based compensation plan (shares) |  |  |  |  | 2,000,000
Increase in number of shares authorized, share-based compensation arrangement (shares) | 2,000,000 |  |  |  |
Number of shares available for grant (shares) |  |  |  | 3,044,097 |
Number of shares of unvested restricted stock units and options outstanding (shares) |  |  |  | 1,576,224 |
Common stock, other shares, outstanding (shares) |  |  |  | 3,078,555 |
Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Maximum authorized amount |  |  | $ 50.0 |  |
Agent fee |  |  | 2.00% |  |
Stock issued during period (shares) |  |  |  | 0 |
Aggregate number of shares issued (shares) |  |  |  | 3,596,154 |
Aggregate proceeds |  |  |  | $ 30.5 |
Remaining authorized amount |  |  |  | $ 18.9 |
Common Stock | Public Offering, Not IPO |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of common shares sold (shares) |  | 12,500,000 |  |  |
Common shares sold (dollars per share) |  | $ 6.00 |  |  |
Proceeds |  | $ 70.1 |  |  |

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