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Unaudited Quarterly Operating Results (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Unaudited Quarterly Operating Results                        
Product revenues, net $ 149,745 $ 136,709 $ 135,546 $ 144,767 $ 129,620 $ 127,013 $ 123,549 $ 83,751   $ 566,767 $ 463,933 $ 276,868
Cost of product revenues (excluding intangible asset amortization) 20,601 20,081 24,257 29,899 37,552 30,622 33,684 16,332   94,838 118,190 59,070
Intangible asset amortization and impairment 34,514 36,317 37,463 37,466 42,279 37,552 37,501 18,923   145,760 136,255 67,181
Total cost of products revenues 55,115 56,398 61,720 67,365 79,831 68,174 71,185 35,255   240,598 254,445 126,251
Gross profit 94,630 80,311 73,826 77,402 49,789 58,839 52,364 48,496   326,169 209,488 150,617
Research and development               3,983 $ 0 0 3,983 9,451
Selling, general and administrative 32,942 35,298 38,193 52,775 38,032 38,372 41,254 54,528   159,208 172,186 118,960
Total operating expenses 32,942 35,298 38,193 52,775 38,032 38,372 41,254 58,511   159,208 176,169 132,989
Income from operations 61,688 45,013 35,633 24,627 11,757 20,467 11,110 (10,015)   166,961 33,319 17,628
Interest expense (19,281) (20,768) (21,863) (21,427) (20,575) (19,046) (17,761) (5,831)   (83,339) (63,213) (21,014)
Interest income 4,303 4,538 4,027 2,747 1,027 11 5 4   15,615 1,047 12
Loss on extinguishment of debt       23,504           23,504    
Income (loss) before income taxes 46,710 28,783 17,797 (17,557) (7,791) 1,432 (6,646) (15,842)   75,733 (28,847) (3,374)
(Benefit from) provision for income taxes 14,770 8,149 4,790 (131) (592) 975 (1,455) (2,773)   27,578 (3,845) (74,891)
Net income (loss) $ 31,940 $ 20,634 $ 13,007 $ (17,426) $ (7,199) $ 457 $ (5,191) $ (13,069)   $ 48,155 $ (25,002) $ 71,517
Earnings (loss) per share - basic (in dollars per share) $ 0.99 $ 0.61 $ 0.38 $ (0.51) $ (0.21) $ 0.01 $ (0.15) $ (0.39)   $ 1.43 $ (0.74) $ 2.05
Weighted-average shares - basic (in shares) 32,301,211 33,744,209 34,622,284 34,319,291 33,582,202 34,058,802 34,001,553 33,673,912   33,741,213 33,829,495 34,936,817
Earnings (loss) per share - diluted (in dollars per share) $ 0.82 $ 0.53 $ 0.34 $ (0.51) $ (0.21) $ 0.01 $ (0.15) $ (0.39)   $ 1.29 $ (0.74) $ 1.86
Weighted-average shares - diluted (in shares) 41,279,981 42,058,821 42,849,952 34,319,291 33,582,202 34,570,319 34,001,553 33,673,912   41,788,125 33,829,495 41,045,805