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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data (Unaudited) Quarterly Financial Data (Unaudited)
The following table sets forth our unaudited quarterly consolidated statements of operations for each of the last four quarters for the periods ended December 31, 2020 and 2019. This unaudited quarterly information has been prepared on the same basis as our annual audited financial statements and includes all adjustments, consisting only of normal recurring adjustments that are necessary to present fairly the financial information for the fiscal quarters presented.
2020:First QuarterSecond QuarterThird QuarterFourth Quarter
Revenue$47,488 $26,106 $23,409 $25,337 
Cost of goods sold41,089 11,906 18,227 32,999 
Operating expenses5,865 5,546 6,431 13,294 
Net income (loss)(84)4,640 36,282 (2,884)
Earnings (loss) per share, basic(1)
— 0.12 0.91 (0.07)
Earnings (loss) per share, diluted(1)
— 0.12 0.91 (0.07)
(1)    Per share amounts are computed independently for each of the quarters presented. The sum of the quarters may not equal the total year amount due to the impact of changes in average quarterly shares outstanding and all other quarterly amounts may not equal the total year due to rounding.

2019:First QuarterSecond QuarterThird QuarterFourth Quarter
Revenue$51,775 $67,941 $65,690 $47,667 
Cost of goods sold40,605 43,068 38,555 29,793 
Operating expenses5,219 5,668 12,687 13,995 
Net income 4,033 14,276 10,926 2,388 
Earnings per share, basic0.10 0.36 0.27 0.06 
Earnings per share, diluted0.10 0.36 0.27 0.05