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Convertible Preferred Stock - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended
Dec. 31, 2020
Oct. 31, 2018
Apr. 30, 2017
Feb. 28, 2021
Convertible Preferred Stock [Line Items]        
Convertible preferred stock, par value $ 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     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   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 7,500,665      
Convertible preferred stock, par value $ 11.65      
Gross proceeds from issuance and conversion of convertible preferred stock $ 87.4      
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