Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.22.0.1
Income Taxes - Additional Information (Detail)
C$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
NIO (C$)
Dec. 31, 2021
USD ($)
Federal statutory rate 21.00% 21.00%    
Domestic Tax Authority [Member]        
Operating loss carryforwards       $ 98.9
Expiration period 2035 through 2038      
Operating loss carryforwards subject to limitations on use $ 2.1      
Domestic Tax Authority [Member] | CANADA | Minimum [Member]        
Open tax year 2018      
Domestic Tax Authority [Member] | CANADA | Maximum [Member]        
Open tax year 2020      
Domestic Tax Authority [Member] | UNITED STATES | Minimum [Member]        
Open tax year 2013      
Domestic Tax Authority [Member] | UNITED STATES | Maximum [Member]        
Open tax year 2020      
Domestic Tax Authority [Member] | Tax Period Two Thousand And Thirty Four Through Two Thousand And Thirty Seven [Member]        
Operating loss carryforwards       11.0
Domestic Tax Authority [Member] | Indefinite Period [Member]        
Operating loss carryforwards       87.9
State and Local Jurisdiction [Member]        
Expiration period 2035 through 2040      
Operating loss carryforwards subject to limitations on use $ 0.4      
State and Local Jurisdiction [Member] | Minimum [Member]        
Open tax year 2018      
State and Local Jurisdiction [Member] | Maximum [Member]        
Open tax year 2020      
State and Local Jurisdiction [Member] | Tax Period Two Thousand And Thirty Five Through Two Thousand And Forty [Member]        
Operating loss carryforwards       $ 84.2
Canada Revenue Agency [Member]        
Expiration period 2025 through 2041      
Canada Revenue Agency [Member] | Tax Period Two Thousand And Thirty Four Through Two Thousand And Forty [Member]        
Non-capital loss carryforwards   $ (106.7) C$ 135.2