Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	1 Months Ended					6 Months Ended
	Nov. 30, 2015	Dec. 31, 2014	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Other Long-Term Liabilities
Deferred Rent						$ 401		$ 409
Net Deferred Tax Liability related to IPR&D						4,661		4,661
Deferred Income from Sale of Tax Benefits						11,620		12,219
Deferred Revenue						4,172		4,368
Total						20,854		21,657
Less Current Portion						(4,360)		(4,418)
Long-Term Portion						$ 16,494		$ 17,239
Amount at which New Jersey tax benefit agreed to be sold	$ 9,800	$ 1,900	$ 1,100	$ 800	$ 800
Amount of sale of New Jersey tax benefit	$ 9,200	$ 1,800	$ 1,000	$ 800	$ 700
Period for which base of operations must be maintained						5 years
Other income related to sale of tax benefits						$ 600	$ 600