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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Prepaid Expenses and Other Current Assets    
Prepaid clinical trial costs $ 1,167 $ 1,148
Prepaid insurance 318 1,663
Prepaid subscriptions and licenses 318  
Prepaid research contracts 199 432
Prepaid rent 91 196
Other 233 149
Total $ 2,326 $ 3,588