Other Long-Term Liabilities (Details) (USD $)	1 Months Ended				3 Months Ended		12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Other Long-Term Liabilities
Deferred Rent					$ 464,000		$ 482,000
Net Deferred Tax Liability related to IPR&D					4,661,000		4,661,000
Deferred Income from Sale of Tax Benefits					3,417,000		4,015,000
Deferred Revenue					5,115,000		5,297,000
Total					13,657,000		14,455,000
Less Current Portion					(2,657,000)		(2,592,000)
Long-Term Portion					11,000,000		11,863,000
Amount at which New Jersey tax benefit agreed to be sold	1,100,000	800,000	800,000	600,000			1,900,000
Amount of sale of New Jersey tax benefit	1,000,000	800,000	700,000	500,000			1,800,000
Period for which base of operations must be maintained					5 years
Other income related to sale of tax benefits					$ 600,000	$ 400,000