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Long-term Debt - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended
May 13, 2024
USD ($)
Feb. 27, 2024
USD ($)
May 12, 2020
USD ($)
Sep. 16, 2019
USD ($)
Jul. 31, 2022
USD ($)
shares
Jul. 31, 2021
USD ($)
shares
Jan. 31, 2021
USD ($)
shares
Sep. 30, 2024
USD ($)
$ / shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Days
$ / shares
Sep. 30, 2023
USD ($)
Mar. 08, 2024
$ / shares
Dec. 31, 2023
USD ($)
Nov. 09, 2019
CounterParty
$ / shares
Debt Instrument [Line Items]                            
Conversion ratio                   25,340.5000        
Proceeds from credit facility                   $ 365,454,000        
SFJ Agreement [Member]                            
Debt Instrument [Line Items]                            
Payment for buyout of development liability elimination $ 366,000,000                          
Payment for buyout of development liability which is due in 2025 $ 200,000                          
Convertible Senior Notes Due 2026 [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, stated percentage       3.50%                    
Debt instrument, due and payment description                   The Convertible Notes are senior unsecured obligations of the Company and bear interest at a rate of 3.5% per year payable semiannually in arrears on March 15 and September 15 of each year, beginning on March 15, 2020.        
Debt instrument, frequency of periodic payment                   semiannually        
Credit facility maturity date       Sep. 15, 2026                    
Threshold trading days | Days                   20        
Threshold consecutive trading days | Days                   30        
Threshold percentage of stock price trigger                   130.00%        
Redemption period, start date                   Sep. 20, 2023        
Redemption price, percentage                   100.00%        
Debt interest expense               $ 900,000 $ 897,000 $ 2,695,000 $ 2,687,000      
Long-term debt outstanding amount               $ 93,263,000   $ 93,263,000     $ 93,033,000  
Convertible Senior Notes Due 2026 [Member] | Prior to March 15, 2026 Convertible [Member]                            
Debt Instrument [Line Items]                            
Threshold trading days | Days                   20        
Threshold consecutive trading days | Days                   30        
Threshold percentage of stock price trigger                   130.00%        
Trading price per principal amount                   $ 1,000,000        
Convertible Senior Notes Due 2026 [Member] | Prior to March 15, 2026 Convertible [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Threshold percentage of stock price trigger                   98.00%        
Convertible Senior Notes Due 2026 [Member] | Common Stock [Member]                            
Debt Instrument [Line Items]                            
Terms of conversion                   The Convertible Notes are convertible into shares of the Company’s common stock at an initial conversion rate of 25.3405 shares per $1,000 principal amount of Convertible Notes (equivalent to an initial conversion price of approximately $39.4625 per share of common stock). The conversion rate is subject to customary anti-dilution adjustments. In addition, following certain events that occur prior to the maturity date or if the Company delivers a notice of redemption, the Company will increase the conversion rate for a holder who elects to convert its Convertible Notes in connection with such corporate event or a notice of redemption, as the case may be, in certain circumstances as provided in the Indenture.        
Conversion price | $ / shares               $ 39.4625   $ 39.4625        
2019 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member]                            
Debt Instrument [Line Items]                            
Net proceeds from the sale of the notes       $ 212,900,000                    
Payment of convertible debt discounts and commissions       6,600,000                    
Payment of convertible debt offering expenses       500,000                    
Payments of transactions cost       28,400,000                    
2019 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] | Exchange Agreements [Member]                            
Debt Instrument [Line Items]                            
Aggregate principal amount converted             $ 126,100,000              
2019 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] | Common Stock [Member] | Exchange Agreements [Member]                            
Debt Instrument [Line Items]                            
Aggregate principal amount converted into shares | shares             3,906,869              
2020 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member]                            
Debt Instrument [Line Items]                            
Net proceeds from the sale of the notes     $ 322,900,000                      
Payment of convertible debt discounts and commissions     5,700,000                      
Payment of convertible debt offering expenses     300,000                      
Payments of transactions cost     43,100,000                      
2020 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] | Exchange Agreements [Member]                            
Debt Instrument [Line Items]                            
Aggregate principal amount converted         $ 98,100,000                  
Convertible notes held in treasury               $ 425,400,000   $ 425,400,000        
2020 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] | Common Stock [Member] | Exchange Agreements [Member]                            
Debt Instrument [Line Items]                            
Aggregate principal amount converted into shares | shares         3,027,018 5,992,217                
2019 and 2020 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] | Exchange Agreements [Member]                            
Debt Instrument [Line Items]                            
Aggregate principal amount converted           $ 201,100,000                
Capped Call Transactions [Member]                            
Debt Instrument [Line Items]                            
Volume-weighted average price per share | $ / shares                       $ 64.11    
Call transactions remaining is a notional amount               $ 93,900,000   $ 93,900,000        
Proceeds from issuance of common stock   $ 98,800,000                        
Number of counterparties | CounterParty                           2
Initial conversion price | $ / shares                           $ 39.4625
Initial cap price | $ / shares                           $ 63.14
Private Offering [Member] | 2019 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member]                            
Debt Instrument [Line Items]                            
Principal amount       $ 220,000,000.0                    
Private Offering [Member] | 2020 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member]                            
Debt Instrument [Line Items]                            
Principal amount     $ 300,000,000.0