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Stockholders' Equity - Narrative (Details) - USD ($)				1 Months Ended	6 Months Ended
	Jun. 05, 2018	Jan. 01, 2018	Jul. 25, 2017	May 31, 2018	Jun. 30, 2018	Jun. 30, 2017	May 13, 2016
Class of Stock [Line Items]
Proceeds					$ 1,973,401	$ 24,060,196
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)					5,894,837
Award vesting period					3 years
Maximum contractual term					10 years
Number of shares of unvested restricted stock units (shares)					192,329
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)					2,914,316
Number of shares of unvested restricted stock units and options outstanding (shares)					1,568,381
Common stock, other shares, outstanding (shares)					3,159,706
Common Stock | Sales Agreement
Class of Stock [Line Items]
Maximum authorized amount				$ 100,000,000.0
Agent fee				3.00%
Aggregate number of shares issued (shares)					92,479
Common shares sold (dollars per share)					$ 4.52
Aggregate proceeds					$ 410,000
Remaining authorized amount					$ 99,600,000
Common Stock | ATM Sales Agreement
Class of Stock [Line Items]
Aggregate number of shares issued (shares)	3,911,104				314,950	2,917,725
Common shares sold (dollars per share)					$ 5.07	$ 8.41
Aggregate proceeds	$ 32,100,000				$ 1,600,000	$ 24,100,000
Common Stock | Public Offering, Not IPO
Class of Stock [Line Items]
Common shares sold (dollars per share)			$ 6.00
Number of common shares sold (shares)			12,500,000
Proceeds			$ 70,100,000

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