Stock-based Compensation - Summary of Stock Option Activity (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2020 $ / shares shares	Dec. 31, 2019 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Outstanding, Beginning balance | shares	6,340,000
Shares, Granted | shares	420,500
Shares, Exercised | shares	(34,374)
Shares, Forfeited / cancelled | shares	(474,900)
Shares, Outstanding, Ending balance | shares	6,251,226	6,340,000
Shares, Vested and exercisable | shares	3,643,514	2,684,160
Weighted Average Exercise Price, Outstanding, Beginning balance | $ / shares	$ 3.92
Weighted Average Exercise Price, Granted | $ / shares	10.46
Weighted Average Exercise Price, Exercised | $ / shares	3.90
Weighted Average Exercise Price, Forfeited / cancelled | $ / shares	4.37
Weighted Average Exercise Price, Outstanding, Ending balance | $ / shares	4.32	$ 3.92
Weighted Average Exercise Price, Vested and exercisable | $ / shares	$ 3.72	$ 3.58
Weighted Average Remaining Contractual Life, Outstanding	7 years 6 months 10 days	8 years 2 months 19 days
Weighted Average Remaining Contractual Life, Vested and exercisable	6 years 10 months 17 days	7 years 4 months 28 days