Acquisition and Stockholders' Equity (Deficit) (Details 7) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended	0 Months Ended
	Feb. 06, 2014	Dec. 31, 2014	Feb. 18, 2014	Dec. 31, 2013
Acquisition and Stockholders' Equity (Deficit)
Decrease in non-controlling interest		$ 1,622
Assets
Decrease in exercise price (in dollars per share)	$ 0.011
Non-Public Company
Assets
Warrants outstanding (in shares)		3,378,453
Non-Public Company | Weighted average
Acquisition and Stockholders' Equity (Deficit)
Exercise price of warrants (in dollars per share)		$ 5.33		$ 5.34
ContraVir Subsidiary
Acquisition and Stockholders' Equity (Deficit)
Shares of subsidiary distributed for each share of the entity's shares outstanding			0.0986
ContraVir Subsidiary | Spin-off
Acquisition and Stockholders' Equity (Deficit)
Decrease in non-controlling interest			1,600
ContraVir Subsidiary | Spin-off
Assets
Cash			3,230
Prepaid expense			6
Total assets			3,236
Accounts payable and other liabilities			(107)
Note Payable to Synergy			(455)
Due to Synergy			(54)
Derivative financial instruments, at estimated fair value-warrants			(880)
Total Liabilities			(1,496)
Net assets			1,740