Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Accrued Liabilities [Abstract]
Accrued salaries, bonus, and benefits	$ 1,891,086	$ 2,452,183
Accrued rent	523,306	965,412
Accrued licenses and maintenance fees	579,825	561,450
Accrued warranties	174,947	222,845	$ 316,835
Accrued taxes	241,688	219,017
Accrued professional services	239,972	180,450
Other	358,128	210,216
Total accrued liabilities	4,008,952	4,811,573
Less: Long term accrued liabilities	(497,314)	(320,409)
Total current accrued liabilities	$ 3,511,638	$ 4,491,164