v3.25.2
Nature of Business, Basis of Presentation and Segment Information (Detail)
$ in Thousands
6 Months Ended
Jul. 11, 2025
Jun. 30, 2025
USD ($)
Segment
Dec. 31, 2024
USD ($)
May 13, 2024
USD ($)
Accumulated deficit   $ 1,624,174 $ 1,563,460  
Cash, cash equivalents and investments   $ 51,700    
Percentage of reduced workforce 20.00%      
Number of operating segments | Segment   1    
Number of reportable segments | Segment   1    
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]   srt:ChiefExecutiveOfficerMember    
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description   net loss as reported on the condensed consolidated statements of operations to monitor budget versus actual results and to ensure we have sufficient capital resources to develop and seek regulatory approval of our product candidates.    
3% Convertible Senior Notes Due 2025 [Member]        
Notes, maturity date   Oct. 15, 2025    
Notes, interest rate   3.00%    
Aggregate principal amount   $ 24,500    
2029 Notes [Member]        
Notes, interest rate   6.00%    
Aggregate principal amount   $ 116,000 $ 116,000 $ 5,000
Minimum [Member] | 2029 Notes [Member]        
Cash, cash equivalents and investments   $ 25,000