Accrued Liabilities (Tables)

9 Months Ended

Sep. 30, 2012

Accrued liabilities [Abstract]

Accrued liabilities

	September 30, 2012		December 31, 2011
Accrued expenses	$	3,280,986	$	2,224,398
Accrued salaries and benefits		1,708,278		1,549,659
Accrued litigation judgment expense		1,100,000		3,300,000
Accrued income tax		2,460,473		141,488
Accrued warranty expense		380,029		427,459
Accrued liabilities	$	8,929,766	$	7,643,004