Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accrued Liabilities [Abstract]
Accrued salaries, bonus, and benefits	$ 2,557,557	$ 3,565,385
Accrued rent	1,407,740	1,499,942
Accrued license and maintenance fees	661,766	302,384
Accrued interest	493,616	498,058
Accrued warranties	364,548	501,212	653,473
Accrued taxes	332,364	360,475
Other	102,479	351,925
Total accrued liabilities	5,920,070	7,079,381
Less: Long term accrued liabilities	(414,928)	(9,622)
Total current accrued liabilities	$ 5,505,142	$ 7,069,759