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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2023
USD ($)
Apr. 30, 2016
USD ($)
Dec. 31, 2023
USD ($)
Customer
Segment
shares
Dec. 31, 2022
USD ($)
Customer
shares
Dec. 31, 2021
USD ($)
shares
Summary Of Significant Accounting Policy [Line Items]          
Charge on finished goods inventory     $ 900 $ 600 $ 1,300
Impairment losses     0    
Finite-lived intangible assets, net     65,490 0  
Amortization of intangible assets     4,093 0 1,108
Impairment Of Intangible Assets Finite lived     0 0  
Advertising costs     9,400 5,500 41,800
Advertising costs capitalized as prepaid expenses     $ 0 $ 0  
Number of large customers | Customer     4 4  
Stock-based compensation expenses         $ 6,800
Antidilutive securities to purchase common stock | shares     21,264,000 21,185,000 17,535,000
Number of business segments | Segment     1    
License Agreements          
Summary Of Significant Accounting Policy [Line Items]          
Finite-lived intangible assets, net $ 40,000        
Amortization of intangible assets     $ 2,400    
Estimated future amortization expense, 2021     3,100    
License Agreements | Neuren          
Summary Of Significant Accounting Policy [Line Items]          
One-time contingent regulatory milestone payment pursuant to agreement with Ipsen Group 40,000        
Finite-lived intangible assets, net $ 29,600        
Amortization of intangible assets     1,700    
Estimated future amortization expense, 2021     2,300    
License Agreements | Ipsen          
Summary Of Significant Accounting Policy [Line Items]          
One-time contingent regulatory milestone payment pursuant to agreement with Ipsen Group   $ 8,000      
Finite-lived intangible assets, net   $ 8,000      
Amortization of intangible assets     $ 0 $ 0 $ 1,100
Customer Concentration Risk | Revenue, Product and Service Benchmark | Four Customers          
Summary Of Significant Accounting Policy [Line Items]          
Concentration risk, percentage     69.00% 73.00%  
Customer Concentration Risk | Accounts Receivable | Four Customers          
Summary Of Significant Accounting Policy [Line Items]          
Concentration risk, percentage     73.00% 74.00%