Description of Business and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Description of Business and Summary of Significant Accounting Policies

Schedule of changes in the product warranty liability

The following table presents the changes in the product warranty liability for the nine months ended September 30, 2018 (in thousands):

	Warranty Liability
Balance at December 31, 2017	$	2,032
Warranty costs accrued		2,452
Warranty claims		(2,375)
Balance at September 30, 2018	$	2,109

Schedule of reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share

The following table presents the reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Numerator:
Net income	$	5,711	$	5,034	$	13,317	$	9,596
Denominator:
Weighted average common stock outstanding for basic net income per common share		26,397		25,050		26,116		24,551
Effect of dilutive securities—stock options and restricted stock units		1,274		2,072		1,373		1,842
Weighted average common shares and dilutive securities outstanding		27,671		27,122		27,489		26,393

Schedule of anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income per share

The following weighted-average common stock equivalents were anti-dilutive and therefore were excluded from the calculation of diluted net income per share (in thousands):

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2018	2017	2018	2017
Options to purchase common stock	—	23	—	881
Restricted stock units	7	—	122	6
Total	7	23	122	887