Stockholder's Equity and Derivative Liability - Derivative Financial Instrument Liability Underwriting Agreement (Details)			3 Months Ended	9 Months Ended	12 Months Ended
	Apr. 04, 2016 USD ($) $ / shares $ / item shares	Oct. 07, 2015 USD ($) $ / shares $ / item shares	Dec. 31, 2016 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares	Oct. 31, 2015 USD ($)	Oct. 13, 2015 USD ($)
Common Stock and Warrant Offering
Exercise price of warrants (in dollars per share) | $ / shares			$ 1.70
Derivative financial instruments liability - warrants				$ 3,912,006	$ 2,115,965
Exercise of warrants (in shares) | shares			50,000
Proceeds from Warrant Exercises			$ 85,000	$ 85,000
Warrants
Common Stock and Warrant Offering
Exercise price of warrants (in dollars per share) | $ / shares			$ 1.70
Derivative financial instruments liability - warrants							$ 4,400,000
Underwriting agreement
Common Stock and Warrant Offering
Purchase price (in dollars per unit) | $ / item		3.00
Gross proceeds from sale of stock and warrants (in dollars)	$ 7,000,000	$ 15,000,000
Underwriting discount and other offering expenses payable	700,000	1,500,000
Expected proceeds if warrants exercised in full	$ 4,100,000	$ 12,800,000
Derivative financial instruments liability - warrants						$ 1,500,000
Underwriting agreement, overallotment option
Common Stock and Warrant Offering
Purchase price (in dollars per unit) | $ / item		3.00
Underwriter option period		45 days
Common stock warrants | Underwriting agreement
Common Stock and Warrant Offering
Maximum number of shares to be purchased from warrants offered for sale | shares	2,464,789	3,000,000
Purchase price (in dollars per unit) | $ / item	1.42
Exercise period for warrants	5 years	5 years
Exercise price of warrants (in dollars per share) | $ / shares	$ 1.70	$ 4.25
Common stock warrants | Underwriting agreement, overallotment option
Common Stock and Warrant Offering
Maximum number of shares to be purchased from warrants offered for sale | shares		450,000
October 13 2015
Common Stock and Warrant Offering
Price of ContraVir common stock | $ / shares				$ 1.77	$ 2.76
Expected warrant term (years)				3 years 6 months 11 days	5 years
Risk-free interest rate (as a percent)				1.61%	1.36%
Expected volatility (as a percent)				70.00%	76.00%
April 4 2016
Common Stock and Warrant Offering
Price of ContraVir common stock | $ / shares				$ 1.77	$ 1.16
Expected warrant term (years)				4 years 4 days	5 years
Risk-free interest rate (as a percent)				1.70%	1.22%
Expected volatility (as a percent)				73.00%	76.00%
Common Stock
Common Stock and Warrant Offering
Exercise of warrants (in shares) | shares				50,000
Common Stock | Underwriting agreement
Common Stock and Warrant Offering
Number of shares offered for sale | shares	4,929,578	5,000,000
Common Stock | Underwriting agreement, overallotment option
Common Stock and Warrant Offering
Number of shares offered for sale | shares		750,000