Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013 sqft	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabilities [Abstract]
Accrued salaries, bonus, and benefits	$ 2,715,907	$ 2,123,167
Accrued rent	1,494,539	1,095,641
Accrued warranties	546,079	653,473	691,832
Accrued interest	496,197	469,049
Accrued license and maintenance fees	340,696	323,901
Other	1,246,379	696,579
Total accrued liabilities	6,839,797	5,361,810
Square feet of office leased space	65,000
Square feet of demonstration and assembly leased space	12,000
Square feet of terminated unimproved space leased space	13,000
Remaining contractual lease obligation	$ 9,380,545