Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	1 Months Ended				9 Months Ended		12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Other Long-Term Liabilities
Deferred Rent					$ 399		$ 482
Net Deferred Tax Liability related to IPR&D					4,661		4,661
Deferred Income from Sale of Tax Benefits					3,417		4,015
Deferred Revenue					4,688		5,297
Total					13,165		14,455
Less Current Portion					(2,795)		(2,592)
Long-Term Portion					$ 10,370		11,863
Amount at which New Jersey tax benefit agreed to be sold	$ 1,100	$ 800	$ 800	$ 600			1,900
Amount of sale of New Jersey tax benefit	$ 1,000	$ 800	$ 700	$ 500			$ 1,800
Period for which base of operations must be maintained					5 years
Other income related to sale of tax benefits					$ 600	$ 400