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Common Stock - Summary of RSA Activity (Details) - Restricted Stock Awards (RSAs)
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Restricted Stock, Beginning balance | shares 196,000
Number of Restricted Stock, Vested | shares (72,000)
Number of Restricted Stock, Ending balance | shares 124,000
Weighted-Average Grant Date Fair Value per Share, Beginning Balance | $ / shares $ 0.00034
Weighted-Average Grant Date Fair Value per Share, Vested | $ / shares 0.00034
Weighted-Average Grant Date Fair Value per Share, Ending Balance | $ / shares $ 0.00034