Accrued Liabilities

3 Months Ended

Mar. 31, 2013

Accrued Liabilities [Abstract]

Accrued Liabilities

7. Accrued Liabilities

Accrued liabilities consist of the following:

	March 31,	December 31,
	2013	2012
Accrued salaries, bonus, and benefits	$     1,885,176	$    2,123,167
Accrued rent	1,120,909	1,095,641
Accrued product warranty	604,388	653,473
Accrued interest	524,885	469,049
Accrued license and maintenance fees	305,977	323,901
Other	596,920	696,579
Total accrued liabilities	$     5,038,255	$    5,361,810