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Convertible Preferred Stock - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended
Dec. 31, 2020
May 31, 2020
Oct. 31, 2018
Apr. 30, 2017
Mar. 31, 2021
Feb. 28, 2021
Convertible Preferred Stock [Line Items]            
Convertible preferred stock, shares issued upon conversion 16,079,230         16,079,230
Convertible preferred stock, shares issued 12,958,452       0  
Convertible preferred stock, par value $ 0.0001       $ 0.0001  
Bridge Loan            
Convertible Preferred Stock [Line Items]            
Debt conversion to stock, aggregate debt plus accrued interest $ 1.9          
2020 Notes            
Convertible Preferred Stock [Line Items]            
Debt conversion to stock, aggregate debt plus accrued interest $ 15.9          
Series A convertible preferred stock            
Convertible Preferred Stock [Line Items]            
Convertible preferred stock, shares issued upon conversion 2,857,142          
Convertible preferred stock, shares issued 2,857,142     2,089,285    
Convertible preferred stock, par value       $ 10.50    
Aggregate purchase price       $ 21.9    
Series A convertible preferred stock | LAV Affiliate            
Convertible Preferred Stock [Line Items]            
Convertible preferred stock, shares issued 767,857          
Series A convertible preferred stock | Terns China            
Convertible Preferred Stock [Line Items]            
Proceeds from sale of convertible preferred stock       $ 8.0    
Series B convertible preferred stock            
Convertible Preferred Stock [Line Items]            
Convertible preferred stock, shares issued upon conversion 5,721,423          
Convertible preferred stock, shares issued 2,600,645   2,384,195      
Convertible preferred stock, par value     $ 30.80      
Aggregate purchase price     $ 73.4      
Series B convertible preferred stock | LAV Affiliate            
Convertible Preferred Stock [Line Items]            
Convertible preferred stock, shares issued 216,450          
Series B convertible preferred stock | Terns China            
Convertible Preferred Stock [Line Items]            
Proceeds from sale of convertible preferred stock     $ 6.7      
Series C convertible preferred stock            
Convertible Preferred Stock [Line Items]            
Convertible preferred stock, shares issued upon conversion 7,500,665          
Convertible preferred stock, shares issued 7,500,665          
Convertible preferred stock, par value $ 11.65          
Gross proceeds from issuance and conversion of convertible preferred stock $ 87.4          
Debt conversion, converted instrument, shares   1,366,820        
Series C convertible preferred stock | Bridge Loan            
Convertible Preferred Stock [Line Items]            
Debt conversion, converted instrument, shares 167,159          
Series C convertible preferred stock | 2020 Notes            
Convertible Preferred Stock [Line Items]            
Debt conversion, converted instrument, shares 1,366,820          
IPO            
Convertible Preferred Stock [Line Items]            
Convertible preferred stock, shares issued upon conversion           16,079,230