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Selected Quarterly Financial Data (unaudited)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data (unaudited)
Selected Quarterly Financial Data (unaudited)
Selected quarterly financial data for years ended December 31, 2017 and 2016 follows (in thousands, except per share data):
 
Quarter Ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
 
2017
 
2017
 
2017
 
2017
Net sales
$
79,242

 
$
79,643

 
$
90,262

 
$
94,651

Gross margin
48,670

 
45,637

 
49,765

 
63,016

Net income (loss)
4,580

 
2,276

 
422

 
(2,071
)
Earnings per share (1):
 
 
 
 
 
 
 
Basic
$
0.09

 
$
0.04

 
$
0.01

 
$
(0.04
)
Diluted
$
0.09

 
$
0.04

 
$
0.01

 
$
(0.04
)
 
 
 
 
 
 
 
 
 
Quarter Ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
 
2016
 
2016
 
2016
 
2016
Net sales
$
55,530

 
$
58,756

 
$
71,882

 
$
82,077

Gross margin
36,902

 
37,299

 
46,565

 
49,770

Net income
3,463

 
3,650

 
3,843

 
6,341

Earnings per share (1):
 
 
 
 
 
 
 
Basic
$
0.06

 
$
0.07

 
$
0.07

 
$
0.12

Diluted
$
0.06

 
$
0.07

 
$
0.07

 
$
0.12


(1) Basic and diluted earnings per share are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted earnings per share.