Stockholders' Equity and Derivative Liability - Warrants - Series C Preferred Stock Issuances and Beneficial Conversion Feature (Details) - USD ($)		12 Months Ended
	Jul. 03, 2018	Dec. 31, 2018
Preferred stock, Common Stock and Warrant Offering
Sales of units (in units)	10,826
Sales price per unit	$ 1,000
Net proceeds from sale of stock	9,900,000	$ 10,414,741
Underwriting discount and other offering expenses payable	$ 900,000
Redemption price per warrant	$ 0.01
Required common stock price to redeem warrants	$ 6.20
Number of common shares converted to common stock		8,852
Number of common shares to be issued for each share converted (in shares)		5,710,963
Deemed dividend charged to additional paid in capital		$ 4,700,000
Stock issuance costs		500,000
Over-Allotment Option
Preferred stock, Common Stock and Warrant Offering
Warrants offered placement fee	279,381
Price of ContraVir common stock	$ 1.71
Fair value of warrants	$ 200,000
Series C convertible preferred stock
Preferred stock, Common Stock and Warrant Offering
Sale of shares (in shares)	10,826
Beneficial conversion amount accreted back as preferred stock		3,800,000
Amount of beneficial conversion feature		$ 3,771,639
Percentage of preferred stock convertible immediately		100.00%
Series C convertible preferred stock | Over-Allotment Option
Preferred stock, Common Stock and Warrant Offering
Fair value of warrants	$ 100,000
Warrants
Preferred stock, Common Stock and Warrant Offering
Number of common stock offered by company to sale	575
Warrants issued (in shares)	6,224,950
Exercise price of warrants (in dollars per share)	$ 1.55
Warrants | Over-Allotment Option
Preferred stock, Common Stock and Warrant Offering
Fair value of warrants	$ 100,000