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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Consolidated Statements of Operations      
Net sales $ 454,163 $ 419,349 $ 542,082
Cost of sales 259,863 261,155 348,363
Gross profit 194,300 158,194 193,719
Operating expenses, net:      
Research and development 78,994 90,557 97,755
Selling, general, and administrative 76,251 79,749 92,060
Amortization of intangible assets 15,333 17,085 32,351
Restructuring 1,097 6,403 8,556
Acquisition costs     2,959
Asset impairment 281 4,020 375,172
Other operating expense (income), net (221) (42) 368
Total operating expenses, net 171,735 197,772 609,221
Operating income (loss) 22,565 (39,578) (415,502)
Interest income 1,551 4,680 3,186
Interest expense (24,739) (22,085) (21,518)
Other income (expense), net (7,841) (20,973)  
Income (loss) before income taxes (8,464) (77,956) (433,834)
Income tax expense (benefit) (73) 777 (26,746)
Net income (loss) $ (8,391) $ (78,733) $ (407,088)
Income (loss) per common share:      
Basic (in dollars per share) $ (0.17) $ (1.66) $ (8.63)
Diluted (in dollars per share) $ (0.17) $ (1.66) $ (8.63)
Weighted average number of shares:      
Basic (in shares) 48,362 47,482 47,151
Diluted (in shares) 48,362 47,482 47,151