Acquisitions and Stockholders' Equity (Deficit) - Spin-off (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Feb. 18, 2014	Feb. 06, 2014	Dec. 31, 2014	Dec. 31, 2015	Feb. 05, 2014
Acquisitions 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)				4,726,823
Non-Public Company | Weighted average
Assets
Exercise price of warrants (in dollars per share)				$ 5.13	$ 5.15
ContraVir Subsidiary
Acquisitions and Stockholders' Equity (Deficit)
Shares of subsidiary distributed for each share of the entity's shares outstanding	0.0986
ContraVir Subsidiary | Spin-off
Acquisitions 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