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Selected Quarterly Financial Data (Unaudited) - Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 30, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 121,007 $ 120,577 $ 110,103 $ 90,068 $ 98,326 $ 94,586 $ 83,205 $ 62,959 $ 441,755 $ 339,076  
Gross profit [1] 118,499 118,572 107,204 87,269 95,306 92,170 80,247 60,009 431,544 327,732  
Net loss $ (66,760) $ (84,660) $ (42,141) $ (88,023) $ (53,036) $ (41,978) $ (54,941) $ (85,304) $ (281,584) $ (235,259) $ (245,192)
Basic and diluted net loss per share $ (0.42) [2] $ (0.05) [2] $ (0.27) [2] $ (0.57) [2] $ (0.34) [2] $ (0.29) [2] $ (0.38) [2] $ (0.59) [2] $ (1.79) [2] $ (1.60) [2] $ (1.94)
[1] Determined by subtracting cost of product sales from product sales, net.
[2] Net loss per common share, basic and diluted, are computed independently for each quarter and the full year based upon respective average shares outstanding. Therefore, the sum of the quarterly net loss per common share amounts may not equal the annual amounts reported.