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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data
Selected unaudited quarterly financial data for the years 2017 and 2018 are summarized below. The Company has derived this data from the unaudited consolidated interim financial statements that, in the Company's opinion, have been prepared on substantially the same basis as the audited financial statements contained elsewhere in this report and include all normal recurring adjustments necessary for a fair presentation of the financial information for the periods presented. These unaudited quarterly results should be read in conjunction with the financial statements and notes thereto included elsewhere in this report. The operating results in any quarter are not necessarily indicative of the results that may be expected for any future period.
 
2017
 
2018
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
(in thousands, except per share data)
Net sales
$
94,505

 
$
119,565

 
$
262,413

 
$
136,628

 
$
93,004

 
$
105,781

 
$
236,699

 
$
132,326

Gross profit
$
30,021

 
$
33,719

 
$
61,781

 
$
30,160

 
$
22,959

 
$
27,941

 
$
64,330

 
$
40,486

Income (loss) from operations
$
(15,724
)
 
$
(14,108
)
 
$
(7,746
)
 
$
(26,580
)
 
$
(35,658
)
 
$
(12,140
)
 
$
20,043

 
$
(4,418
)
Income (loss) before provision (benefit) for income taxes
$
(18,629
)
 
$
(16,371
)
 
$
(16,651
)
 
$
(29,771
)
 
$
(38,529
)
 
$
(16,497
)
 
$
17,652

 
$
(2,100
)
Net income (loss)
$
(18,285
)
 
$
(16,687
)
 
$
(17,569
)
 
$
(30,487
)
 
$
(36,193
)
 
$
(18,588
)
 
$
15,699

 
$
(3,343
)
Basic earnings (loss) per share
$
(1.01
)
 
$
(0.77
)
 
$
(0.77
)
 
$
(1.33
)
 
$
(1.57
)
 
$
(0.80
)
 
$
0.68

 
$
(0.14
)
Weighted average shares
outstanding
18,104

 
21,616

 
22,772

 
22,799

 
23,100

 
23,106

 
23,106

 
23,106

Diluted earnings (loss) per share
$
(1.01
)
 
$
(0.77
)
 
$
(0.77
)
 
$
(1.33
)
 
$
(1.57
)
 
$
(0.80
)
 
$
0.38

 
$
(0.14
)
Weighted average shares and
equivalents outstanding
18,104

 
21,616

 
22,772

 
22,799

 
23,100

 
23,106

 
45,686

 
23,106