Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabilities [Abstract]
Accrued salaries, bonus, and benefits	$ 2,247,842	$ 2,123,167
Accrued rent	1,146,175	1,095,641
Accrued warranties	536,098	653,473	691,832
Accrued interest	515,009	469,049
Accrued license and maintenance fees	322,111	323,901
Other	869,769	696,579
Total accrued liabilities	$ 5,637,004	$ 5,361,810