Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accrued Liabilities [Abstract]
Accrued salaries, bonus, and benefits	$ 2,452,183	$ 3,053,012
Accrued rent	965,412	1,361,379
Accrued licenses and maintenance fees	561,450	666,373
Accrued interest		494,703
Accrued warranties	222,845	316,835	$ 364,548
Accrued taxes	219,017	324,226
Accrued professional services	180,450	27,140
Other	210,216	90,325
Total accrued liabilities	4,811,573	6,333,993
Less: Long term accrued liabilities	(320,409)	(275,603)
Total current accrued liabilities	$ 4,491,164	$ 6,058,390