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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Stock-based compensation Stock-based compensation expense for the three and six months ended June 30, 2021 and 2020 was as follows:
Three months ended June 30,Six Months Ended June 30,
2021202020212020
Research and development$427 $14 $771 $15 
General and administrative2,367 159 3,386 162 
Total stock-based compensation$2,794 $173 $4,157 $177