Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Accrued Liabilities [Abstract]
Accrued salaries, bonus, and benefits	$ 2,652,318	$ 3,053,012
Accrued rent	1,159,038	1,361,379
Accrued licenses and maintenance fees	575,583	666,373
Accrued interest	494,067	494,703
Accrued warranties	258,450	316,835	$ 364,548
Accrued taxes	313,379	324,226
Other	248,516	117,465
Total accrued liabilities	5,701,351	6,333,993
Less: Long term accrued liabilities	(270,296)	(275,603)
Total current accrued liabilities	$ 5,431,055	$ 6,058,390