S. SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data

The following tables set forth a summary of the Company’s quarterly financial information for each of the four quarters for the years ended December 31, 2015 and 2014.

	First			Second			Third			Fourth
Year ended December 31, 2015	Quarter			Quarter			Quarter			Quarter
Revenue	$	30,234		$	49,632		$	57,085		$	52,952
Cost of goods sold		20,183			32,901			39,032			37,334
Gross profit	$	10,051		$	16,731		$	18,053		$	15,618
Gross margin		33.2%			33.7%			31.6%			29.5%
Operating expenses:
Research and development	$	4,805		$	4,701		$	5,386		$	5,960
Sales and marketing		1,559			1,607			1,582			1,633
General and administrative		5,003			4,534			4,963			5,271
Total operating expenses	$	11,367		$	10,842		$	11,931		$	12,864
Income from operations	$	(1,316	)	$	5,889		$	6,122		$	2,754
Interest and other income (expense), net		641			335			(3,016	)		(241	)
Net income before taxes	$	(675	)	$	6,224		$	3,106		$	2,513
Income taxes		–			(135	)		(406	)		166
Net income	$	(675	)	$	6,089		$	2,700		$	2,679
Net income per share—basic		(0.05	)		0.41			0.17			0.16
Net income per share—diluted		(0.05	)		0.38			0.16			0.15

	First			Second			Third			Fourth
Year ended December 31, 2014	Quarter			Quarter			Quarter			Quarter
Revenue	$	24,859		$	32,650		$	36,549		$	36,391
Cost of goods sold		16,206			21,462			24,403			24,132
Gross profit	$	8,653		$	11,188		$	12,146		$	12,259
Gross margin		34.8%			34.3%			33.2%			33.7%
Operating expenses:
Research and development	$	3,546		$	4,009		$	4,194		$	4,221
Sales and marketing		1,333			1,497			1,622			1,591
General and administrative		3,554			3,952			4,458			5,131
Total operating expenses	$	8,433		$	9,458		$	10,274		$	10,943
Income from operations	$	220		$	1,730		$	1,872		$	1,316
Interest and other income (expense), net		(110	)		274			(218	)		(602	)
Net income before taxes	$	110		$	2,004		$	1,654		$	714
Income taxes		(25	)		(85	)		(77	)		(12	)
Net income	$	85		$	1,919		$	1,577		$	702
Net income per share—basic	$	0.01		$	0.13		$	0.11		$	0.05
Net income per share—diluted	$	0.01		$	0.12		$	0.10		$	0.05