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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Net sales $ 116,155 $ 95,962
Cost of sales (71,024) (57,581)
Gross profit 45,131 38,381
Operating expenses (41,444) (36,545)
Adjustment to bargain purchase gain on business acquisition (33)  
Operating income 3,654 1,836
Change in fair value of an equity investment 1,066  
Other income 672  
Interest expense, net (946) (1,508)
Income before provision for income taxes (benefit) and loss on equity method investment 4,446 328
Income tax (expense) benefit (1,362) 205
Income before loss from equity method investment 3,084 533
Loss from equity method investment (13) (13)
Net income $ 3,071 $ 520
Earnings per common share—basic $ 0.10 $ 0.02
Earnings per common share—assuming dilution $ 0.10 $ 0.02
Weighted average shares outstanding—basic 29,737 29,288
Weighted average shares outstanding—assuming dilution 30,523 29,948