Acquisitions and Stockholders' Equity (Deficit) - Contra Vir Private Placement (Details) - USD ($)		12 Months Ended
	Feb. 04, 2014	Dec. 31, 2014	Dec. 31, 2015
Acquisitions and Stockholders' Equity (Deficit)
Gross Proceeds		$ 3,224,000
Derivative liabilities related to Warrants		$ 172,000	$ 322,000
ContraVir Subsidiary | February 4, 2014 Private Placement
Acquisitions and Stockholders' Equity (Deficit)
Gross Proceeds	$ 3,200,000
Expenses related to private placement	$ 15,000
Number of units sold (in shares)	9,485,294
Number of shares of common stock per unit	1
Number of warrants per unit (in shares)	1
Number of common shares that can be acquired upon exercise of each warrant	0.5
Purchase price (in dollars per unit)	$ 0.34
ContraVir Subsidiary | February 4, 2014 Private Placement | Warrants
Acquisitions and Stockholders' Equity (Deficit)
Non-public warrants outstanding (in shares)	4,700,000
Expiration period of warrant	6 years
Exercise price of warrants (in dollars per share)	$ 0.37
Derivative liabilities related to Warrants	$ 880,000