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Certain Balance Sheet Accounts - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]          
Capitalized transaction costs $ 0   $ 0   $ 522
Amortization expense 37 $ 29 108 $ 74  
Old Owlet [Member]          
Property, Plant and Equipment [Line Items]          
Capitalized transaction costs 11,836   11,836    
Film Production Costs [Member]          
Property, Plant and Equipment [Line Items]          
Amortization expense 26 18 76 41  
Patents and Trademarks [Member]          
Property, Plant and Equipment [Line Items]          
Legal costs     161    
Tooling and Manufacturing Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Depreciation and amortization expense 160 152 457 308  
Internally Developed Software [Member]          
Property, Plant and Equipment [Line Items]          
Amortization expense 0   0    
Property and Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Depreciation and amortization expense $ 253 $ 230 $ 691 $ 547