v3.25.2
Stock-Based Compensation - Summary of Stock Awards Granted (Detail) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants, Stock options 22,016 5,100 488,192 321,478
Weighted Average Grant Date Fair Value, Stock options $ 13.98 $ 72.37 $ 46.93 $ 67.63
Grants, Restricted stock units 317,317 54,905 [1] 1,815,501 [2] 1,216,890 [1]
Weighted Average Grant Date Fair Value, Restricted stock units $ 17.1 $ 138.91 $ 83.72 $ 129.05
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants, Restricted stock units   8,860 120,378 97,460
[1] Included in RSUs for the three and six months ended June 30, 2024 are 8,860 and 97,460 shares with performance conditions (the “March 2024 PSUs”), respectively, which are related to the achievement of certain financial performance goals and regulatory approval of certain of the Company's product candidates. The expanded regulatory approval of ELEVIDYS in June 2024 resulted in the cliff-vesting of 44,300 shares during the year ended December 31, 2024. The achievement of certain financial performance targets during the three months ended June 30, 2025 resulted in 38,050 shares of the March 2024 PSUs becoming eligible for vesting, which is contingent on the fulfillment of remaining service conditions. As of June 30, 2025, none of the remaining performance conditions associated with the March 2024 PSUs were probable of being achieved.
[2] Included in restricted stock units (“RSUs”) for the six months ended June 30, 2025 are 120,378 shares with performance conditions which are related to the achievement of certain financial performance goals, regulatory development and approval of certain of the Company's product candidates and certain manufacturing achievements. As of June 30, 2025, none of the performance conditions were probable of being achieved. Stock options and the remaining RSUs granted during the three and six months ended June 30, 2025 have only service-based criteria and vest over four years.