v3.25.2
Summary of Significant Accounting Policies - Summary of Total Revenue by Geographic Region Based on Customers' Locations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ 447 $ 646 $ 768 $ 1,142
Europe [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue 324 512 496 934
United States [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue 60 67 177 113
Other [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ 63 $ 67 $ 95 $ 95