Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

Additional assumptions used for the CEO Performance Award and the resulting estimates of weighted-average fair value per share of options granted are as follows:

Volatility	47.71%
Risk-free interest rate	2.98%
Dividend rate	—
Expected life of options	9.76 years
Weighted average grant date fair value of options granted	$38.64

Summary of Changes in Estimated Product Warranty Liabilities

Changes in our estimated warranty reserve were as follows (in thousands):

	2018			2017			2016
Balance, January 1	$	644		$	780		$	314
Utilization of reserve	(458		)	(245		)	(155		)
Warranty expense	712			109			621
Balance, December 31	$	898		$	644		$	780

Net Sales by Geographic Area

For the years ended December 31, 2018, 2017 and 2016, net sales by geographic area as well as the percentage relationship to total net sales included in the accompanying statements of operations were as follows (in thousands):

	Year Ended December 31,
	2018				2017 (1)				2016 (1)
United States	$	335,310	79.8	%	$	282,810	82.3	%	$	218,757	81.6	%
Other Countries	84,758		20.2		60,988		17.7		49,488		18.4
Total	$	420,068	100.0	%	$	343,798	100.0	%	$	268,245	100.0	%

⁽¹⁾ Amounts for the years ended December 31, 2017 and 2016 have not been adjusted under the modified retrospective method of adoption of Topic 606, and are presented consistent with the prior period amounts reported under ASC 605.

Weighted Average Number of Shares Outstanding and Income Per Share

The calculation of the weighted average number of shares outstanding and earnings per share are as follows (in thousands except per share data):

	For the Year Ended December 31,
	2018		2017		2016
Numerator for basic and diluted earnings per share:
Net income	$	29,205	$	5,207	$	17,297
Denominator:
Weighted average shares outstanding—basic	56,392		52,726		52,667
Dilutive effect of stock-based awards	1,530		1,172		869
Diluted weighted average shares outstanding	57,922		53,898		53,536
Anti-dilutive stock-based awards excluded	6,757		386		443
Net income per common share:
Basic	$	0.52	$	0.10	$	0.33
Diluted	$	0.50	$	0.10	$	0.32