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Note V - Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 48,658 $ 46,084 $ 43,411 $ 52,719 $ 58,018 $ 56,386 $ 87,822 $ 65,239 $ 190,872 $ 267,465 $ 382,329
Cost of goods sold 37,322 34,108 32,873 40,368 47,481 38,849 53,959 39,403 144,671 179,692 216,049
Gross profit $ 11,336 $ 11,976 $ 10,538 $ 12,351 $ 10,537 $ 17,537 $ 33,863 $ 25,836 46,201 87,773 166,280
Gross margin 23.30% 26.00% 24.30% 23.40% 18.20% 31.10% 38.60% 39.60%      
Research and development $ 10,597 $ 10,466 $ 11,151 $ 11,185 $ 11,342 $ 14,180 $ 12,645 $ 11,736 43,399 49,903 35,365
Sales and marketing 2,615 2,518 2,331 2,595 1,920 2,370 2,377 2,474 10,060 9,141 8,702
General and administrative 10,178 9,988 10,884 10,440 9,552 10,591 9,898 9,456 41,489 39,497 35,262
Total operating expenses 23,390 22,972 24,366 24,220 22,814 27,141 24,920 23,666 94,948 98,541 79,329
Income (loss) from operations (12,054) (10,996) (13,828) (11,869) (12,277) (9,604) 8,943 2,170 (48,747) (10,768) 86,951
Interest and other income (expense), net (1,109) 276 (729) (1,079) 71 578 1,387 (1,046) (2,640) 990 (2,425)
Total income (loss) before income taxes (13,163) (10,720) (14,557) (12,948) (12,206) (9,026) 10,330 1,124 (51,387) (9,778) 84,526
Income tax (expense) benefit (22,267) 1,940 3,191 2,474 3,638 5,294 (2,296) 996 (14,662) 7,632 (10,575)
Net income (loss) $ (35,430) $ (8,780) $ (11,366) $ (10,474) $ (8,568) $ (3,732) $ 8,034 $ 2,120 $ (66,049) $ (2,146) $ 73,951
Net income (loss) per share—basic (in dollars per share) $ (1.76) $ (0.44) $ (0.57) $ (0.53) $ (0.43) $ (0.19) $ 0.41 $ 0.11 $ (3.31) $ (0.11) $ 3.87
Net income (loss) per share—diluted (in dollars per share) $ (1.76) $ (0.44) $ (0.57) $ (0.53) $ (0.43) $ (0.19) $ 0.40 $ 0.11 $ (3.31) $ (0.11) $ 3.67