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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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