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Stock Option Plan - Stock Option Activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, December 31, 2019 (in shares) | shares	1,375,542
Granted (in shares) | shares	901,531
Exercised (in shares) | shares	(47,354)
Forfeited (in shares) | shares	(244,749)
Expired (in shares) | shares	(9,720)
Outstanding, September 30, 2020 (in shares) | shares	1,975,250	1,375,542
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, December 31, 2019, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 8.33
Granted, Weighted Average Exercise Price (in dollars per share) | $ / shares	16.14
Exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares	0.27
Forfeited, Weighted Average Exercise Price (in dollars per share) | $ / shares	10.05
Expired, Weighted Average Exercise Price (in dollars per share) | $ / shares	29.11
Outstanding, September 30, 2020, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 11.77	$ 8.33
Stock Options, Additional Disclosures [Abstract]
Outstanding, Weighted Average Remaining Contractual Term	8 years 11 months 8 days	9 years 1 month 28 days
Vested and expected to vest, Weighted Average Remaining Contractual Term	8 years 11 months 8 days
Options exercisable, Weighted Average Remaining Contractual Term	8 years 3 months
Outstanding, Aggregate Intrinsic Value | $	$ 5,064	$ 23,654
Vested and expected to vest, Aggregate Intrinsic Value | $	5,064
Options exercisable, Aggregate Intrinsic Value | $	$ 2,430
Vested and expected to vest, September 30, 2020 (in shares) | shares	1,975,250
Options exercisable, September 30, 2020 (in Shares) | shares	394,739
Vested and expected to vest, September 30, 2020, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 11.77
Options exercised, September 30, 2020, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 6.51

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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