Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabilities [Abstract]
Accrued salaries, bonus, and benefits	$ 3,565,385	$ 2,123,167
Accrued rent	1,499,942	1,095,641
Accrued warranties	501,212	653,473	691,832
Accrued interest	498,058	469,049
Accrued license and maintenance fees	302,384	323,901
Accrued taxes	360,475	245,802
Other	351,925	450,777
Total accrued liabilities	$ 7,079,381	$ 5,361,810