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Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | ---
May. 08, 2015 shares | May. 05, 2015 USD ($) $ / shares shares | May. 22, 2014 shares | May. 14, 2010 shares | Mar. 31, 2016 plan shares
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |
Stock issued during period (shares) |  | 10,925,000 |  |  |
Offering price ($ per share) | $ / shares |  | $ 8.00 |  |  |
Proceeds from initial public offering | $ |  | $ 81.9 |  |  |
Number of plans | plan |  |  |  |  | 1
Award vesting period |  |  |  |  | 3 years
Maximum contractual term |  |  |  |  | 10 years
Stock and Cash Based Incentive Plan [Member] |  |  |  |  |
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |
Number of additional shares authorized | 2,000,000 |  | 1,250,000 | 500,000 |
Number of potential shares authorized for issuance under share based compensation plan |  |  |  | 513,833 |
Number of shares authorized |  |  |  |  | 7,770,497
Number of shares available for grant |  |  |  |  | 633,988
Number of shares of unvested restricted stock units and options outstanding |  |  |  |  | 732,668
Common stock, other shares, outstanding (shares) |  |  |  |  | 5,821,784
Amended 2000 Stock Option Plan [Member] |  |  |  |  |
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |
Options outstanding (shares) |  |  |  |  | 106,877
VGX Equity Compensation Plan [Member] |  |  |  |  |
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |
Options outstanding (shares) |  |  |  |  | 1,206,963
Over-Allotment Option [Member] |  |  |  |  |
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |
Stock issued during period (shares) |  | 1,425,000 |  |  |

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- Definition Stockholders' equity. + References No definition available. + Details
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- Definition Total number of shares of other common stock instruments held by shareholders, such as exchangeable shares. May be all or portion of the number of common shares authorized. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from entity's first offering of stock to the public. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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