Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accrued Liabilities [Abstract]
Accrued salaries, bonus, and benefits	$ 1,641,491	$ 2,452,183
Accrued rent	441,417	965,412
Accrued licenses and maintenance fees	581,672	561,450
Accrued warranties	164,365	222,845	$ 316,835
Accrued taxes	234,668	219,017
Accrued professional services	367,072	180,450
Other	299,931	210,216
Total accrued liabilities	3,730,616	4,811,573
Less: Long term accrued liabilities	(535,369)	(320,409)
Total current accrued liabilities	$ 3,195,247	$ 4,491,164