v3.26.1
Summary of Significant Accounting Policies - Summary of Revenue by Customer Incorporation Location (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Revenue From External Customers By Geographic Areas [Line Items]        
Revenues ¥ 417,981 $ 59,770 ¥ 456,152 ¥ 117,426
Percentage of revenues 100.00% 100.00% 100.00% 100.00%
PRC [Member]        
Revenue From External Customers By Geographic Areas [Line Items]        
Revenues ¥ 402,333 $ 57,532 ¥ 431,338 ¥ 96,580
Percentage of revenues 97.00% 97.00% 95.00% 82.00%
East Asia [Member]        
Revenue From External Customers By Geographic Areas [Line Items]        
Revenues ¥ 14,369 $ 2,055 ¥ 3,028 ¥ 6,018
Percentage of revenues 3.00% 3.00% 1.00% 5.00%
West Asia [Member]        
Revenue From External Customers By Geographic Areas [Line Items]        
Revenues ¥ 564 $ 81 ¥ 14,485 ¥ 9,188
Percentage of revenues 0.00% 0.00% 3.00% 8.00%
Europe [Member]        
Revenue From External Customers By Geographic Areas [Line Items]        
Revenues ¥ 372 $ 53 ¥ 321 ¥ 501
Percentage of revenues 0.00% 0.00% 0.00% 1.00%
South Asia [Member]        
Revenue From External Customers By Geographic Areas [Line Items]        
Revenues ¥ 217 $ 31 ¥ 0 ¥ 0
Percentage of revenues 0.00% 0.00% 0.00% 0.00%
East Africa [Member]        
Revenue From External Customers By Geographic Areas [Line Items]        
Revenues ¥ 126 $ 18 ¥ 0 ¥ 0
Percentage of revenues 0.00% 0.00% 0.00% 0.00%
West Africa [Member]        
Revenue From External Customers By Geographic Areas [Line Items]        
Revenues ¥ 0 $ 0 ¥ 1,851 ¥ 0
Percentage of revenues 0.00% 0.00% 0.00% 0.00%
North America [Member]        
Revenue From External Customers By Geographic Areas [Line Items]        
Revenues ¥ 0 $ 0 ¥ 2,616 ¥ 0
Percentage of revenues 0.00% 0.00% 1.00% 0.00%
South America [Member]        
Revenue From External Customers By Geographic Areas [Line Items]        
Revenues ¥ 0 $ 0 ¥ 2,513 ¥ 4,729
Percentage of revenues 0.00% 0.00% 0.00% 4.00%
Other [Member]        
Revenue From External Customers By Geographic Areas [Line Items]        
Revenues ¥ 0 $ 0 ¥ 0 ¥ 410
Percentage of revenues 0.00% 0.00% 0.00% 0.00%