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Fair Value Measurements - Summary of Financial Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Assets    
Short-term marketable securities $ 70,212 $ 49,620 [1]
Level 1 | Recurring    
Assets    
Total assets measured at fair value 19,371 4,207
Level 2 | Recurring    
Assets    
Total assets measured at fair value 170,606 49,620
Level 3 | Recurring    
Assets    
Total assets measured at fair value 0 0
Carrying Value | Recurring    
Assets    
Total assets measured at fair value 189,977 53,827
Fair Value | Recurring    
Assets    
Total assets measured at fair value 189,977 53,827
Agency bonds    
Assets    
Short-term marketable securities 1,276  
Agency bonds | Level 1 | Recurring    
Assets    
Short-term marketable securities 0 0
Agency bonds | Level 2 | Recurring    
Assets    
Short-term marketable securities 1,276 35,423
Agency bonds | Level 3 | Recurring    
Assets    
Short-term marketable securities 0 0
Agency bonds | Carrying Value | Recurring    
Assets    
Short-term marketable securities 1,276 35,423
Agency bonds | Fair Value | Recurring    
Assets    
Short-term marketable securities 1,276 35,423
Commercial paper    
Assets    
Short-term marketable securities 66,414  
Commercial paper | Level 1 | Recurring    
Assets    
Short-term marketable securities 0 0
Commercial paper | Level 2 | Recurring    
Assets    
Short-term marketable securities 66,414 14,197
Commercial paper | Level 3 | Recurring    
Assets    
Short-term marketable securities 0 0
Commercial paper | Carrying Value | Recurring    
Assets    
Short-term marketable securities 66,414 14,197
Commercial paper | Fair Value | Recurring    
Assets    
Short-term marketable securities 66,414 14,197
Corporate bond    
Assets    
Short-term marketable securities 2,522  
Corporate bond | Level 1 | Recurring    
Assets    
Short-term marketable securities 0  
Corporate bond | Level 2 | Recurring    
Assets    
Short-term marketable securities 2,522  
Corporate bond | Level 3 | Recurring    
Assets    
Short-term marketable securities 0  
Corporate bond | Carrying Value | Recurring    
Assets    
Short-term marketable securities 2,522  
Corporate bond | Fair Value | Recurring    
Assets    
Short-term marketable securities 2,522  
Money market funds    
Assets    
Cash equivalents 19,371  
Money market funds | Level 1 | Recurring    
Assets    
Cash equivalents 19,371 4,207
Money market funds | Level 2 | Recurring    
Assets    
Cash equivalents 0 0
Money market funds | Level 3 | Recurring    
Assets    
Cash equivalents 0 0
Money market funds | Carrying Value | Recurring    
Assets    
Cash equivalents 19,371 4,207
Money market funds | Fair Value | Recurring    
Assets    
Cash equivalents 19,371 $ 4,207
Commercial paper    
Assets    
Cash equivalents 100,394  
Commercial paper | Level 1 | Recurring    
Assets    
Cash equivalents 0  
Commercial paper | Level 2 | Recurring    
Assets    
Cash equivalents 100,394  
Commercial paper | Level 3 | Recurring    
Assets    
Cash equivalents 0  
Commercial paper | Carrying Value | Recurring    
Assets    
Cash equivalents 100,394  
Commercial paper | Fair Value | Recurring    
Assets    
Cash equivalents $ 100,394  
[1] See Note 1 – Summary of Business and Significant Accounting Policies