XML 69 R59.htm IDEA: XBRL DOCUMENT v3.21.2
Related Parties - Additional Information (Details) - Stockholder - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Related Party Transaction [Line Items]    
Expenses incurred for research and development related services $ 400 $ 300
Accrued expense, related party $ 10 $ 100