Stockholders' Equity - Schedule of 2017 Plan Options Outstanding (Details) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Number of Options Outstanding
Outstanding at beginning of period (in shares) | shares	0
Granted (in shares) | shares	56,500
Exercised (in shares) | shares	0
Forfeited (in shares) | shares	0
Outstanding at end of period (in shares) | shares	56,500	0
Weighted- average Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares
Granted (in dollars per share) | $ / shares	16.41
Exercised (in dollars per share) | $ / shares
Forfeited (in dollars per share) | $ / shares
Outstanding at end of period (in dollars per share) | $ / shares	$ 16.41
Weighted- average Remaining Contractual Term (years)
Outstanding	9 years 9 months 18 days
Aggregate Intrinsic Value
Outstanding | $	$ 527,145
2017 Plan
Number of Options Outstanding
Outstanding at beginning of period (in shares) | shares	611,760
Granted (in shares) | shares	159,585
Exercised (in shares) | shares	(2,521)
Forfeited (in shares) | shares	(6,044)
Outstanding at end of period (in shares) | shares	762,780	611,760
Weighted- average Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 21.39
Granted (in dollars per share) | $ / shares	12.11
Exercised (in dollars per share) | $ / shares	9.03
Forfeited (in dollars per share) | $ / shares	11.38
Outstanding at end of period (in dollars per share) | $ / shares	$ 19.53	$ 21.39
Weighted- average Remaining Contractual Term (years)
Outstanding	7 years 6 months 25 days	7 years 10 months 6 days
Aggregate Intrinsic Value
Outstanding | $	$ 6,307,064	$ 0