Summary of Significant Accounting Policies - Antidilutive Shares (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	24,510,729	21,903,861	19,897,500	21,903,861
Options outstanding under stock incentive plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	4,304,660	7,359,841	0	7,359,841
Options outstanding outside of stock incentive plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	0	134,586	0	134,586
Common stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	20,206,069	499,534	19,897,500	499,534
SAFE notes outstanding (shares not reserved)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total (in shares)	0	13,909,900	0	13,909,900