Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014 sqft	Sep. 30, 2013 sqft	Dec. 31, 2013	Dec. 31, 2012
Operating Leased Assets [Line Items]
Accrued salaries, bonus, and benefits	$ 3,811,420		$ 3,565,385
Accrued rent	1,490,004		1,499,942
Accrued warranties	449,718		501,212	653,473
Accrued interest	496,405		498,058
Accrued taxes	293,267		360,475
Other	1,263,592		654,309
Total accrued liabilities	7,804,406		7,079,381
Square feet of office leased space	52,000
Square feet of demonstration and assembly leased space	12,000
Square feet of terminated unimproved space leased space		13,000
Lease Termination Costs [Member]
Operating Leased Assets [Line Items]
Accrued rent	$ 473,114	$ 515,138