Organization and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

Net Sales by Geographic Area

For the three and nine months ended September 30, 2013 and 2012, net sales by geographic area were as follows (dollars in thousands):

	Three Months Ended September 30,								Nine Months Ended September 30,
	2013				2012				2013				2012
United States	$	31,483	89	%	$	23,335	81	%	$	86,036	88	%	$	68,341	83	%
Other Countries		3,714	11			5,438	19			11,770	12			14,296	17
Total	$	35,197	100	%	$	28,773	100	%	$	97,806	100	%	$	82,637	100	%

Weighted Average Number of Shares Outstanding and Income Per Share

The calculation of the weighted average number of shares outstanding and income per share are as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Numerator for basic and diluted earnings per share:
Net income	$	5,113,592	$	3,676,872	$	12,868,947	$	10,922,936
Denominator:
Weighted average shares outstanding—basic		51,341,785		52,509,068		51,727,197		57,997,341
Dilutive effect of stock-based awards		1,979,133		597,257		1,916,606		485,492
Diluted weighted average shares outstanding		53,320,918		53,106,325		53,643,803		58,482,833
Anti-dilutive stock-based awards excluded		565,099		4,732,366		898,230		5,261,887
Net income per common share:
Basic	$	0.10	$	0.07	$	0.25	$	0.19
Diluted	$	0.10	$	0.07	$	0.24	$	0.19

Summary of Changes in Estimated Product Warranty Liabilities

Changes in the Company’s estimated product warranty liabilities are as follows:

	Nine Months Ended September 30,
	2013			2012
Balance, January 1,	$	483,721		$	427,459
Utilization of accrual		(419,351	)		(312,570	)
Warranty expense		643,674			265,140
Balance, September 30,	$	708,044		$	380,029