v3.25.2
Unrestricted Net Assets - Condensed Financial Information on Results of Operations (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Condensed Financial Information on Results of Operations [Line Items]            
Revenue $ 1,706,221   $ 3,888,893   $ 5,143,948 $ 8,484,424
Cost or revenues 2,620,029   2,988,266   5,667,098 6,039,807
Operating expenses 1,280,083   2,067,875   4,245,399 3,283,884
Income taxes 0   2,799   0 2,799
Net (loss) income – Consolidated $ (2,261,558) $ (2,630,729) $ (997,495) $ 60,035 (4,892,287) (937,462)
Northann Corp [Member]            
Condensed Financial Information on Results of Operations [Line Items]            
Revenue         0 0
Cost or revenues         0 0
Operating expenses         1,050,859 1,598,981
Income taxes         0 933
Income (loss) – Parent only         (1,050,859) (1,599,915)
Income (loss) – Subsidiaries with unrestricted net assets         (3,719,877) 622,163
(Loss) – Subsidiaries with restricted net assets         (121,551) 290
Net (loss) income – Consolidated         $ (4,892,287) $ 937,462