Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accrued Liabilities [Abstract]
Accrued salaries, bonus, and benefits	$ 2,274,587	$ 2,452,183
Accrued rent	723,770	965,412
Accrued licenses and maintenance fees	559,605	561,450
Accrued warranties	193,064	222,845	$ 316,835
Accrued taxes	265,901	219,017
Accrued professional services	116,700	180,450
Other	272,614	210,216
Total accrued liabilities	4,406,241	4,811,573
Less: Long term accrued liabilities	(320,545)	(320,409)
Total current accrued liabilities	$ 4,085,696	$ 4,491,164