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Organization and Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
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):
 
Three Months Ended March 31,
 
2018
 
2017
Numerator for basic and diluted earnings per share:
 
 
 
Net income
$
12,926

 
$
4,580

Denominator:
 
 
 
Weighted average shares outstanding
53,119

 
52,418

Dilutive effect of stock-based awards
1,413

 
1,259

Diluted weighted average shares outstanding
54,532

 
53,677

Anti-dilutive stock-based awards excluded
404

 
676

Net income per common share:
 
 
 
Basic
$
0.24

 
$
0.09

Diluted
$
0.24

 
$
0.09
Summary of Changes in Estimated Product Warranty Liabilities
Changes in the Company’s estimated product warranty liabilities were as follows (in thousands):
 
Three Months Ended March 31,
 
2018
 
2017
Balance, beginning of period
$
644

 
$
780

Utilization of accrual
(93
)
 
(66
)
Warranty expense (recovery)
8

 
(367
)
Balance, end of period
$
559

 
$
347