Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2020

Stockholders' Equity

Schedule of stock option activity

				Weighted
		Weighted		average	Aggregate
	Number	average		contractual	intrinsic
	of shares	exercise price		term	value
Outstanding at December 31, 2019	3,458,447	$	10.19
Granted	630,135		53.75
Exercised	(80,614)		10.17
Forfeited	(28,361)		14.23
Expired	—		—
Outstanding at June 30, 2020	3,979,607	$	17.06	7.8	$	259,886,170
Vested and expected to vest at June 30, 2020	3,973,438	$	17.08	7.8	$	259,386,596
Exercisable at June 30, 2020	2,177,471	$	9.07	6.3	$	159,414,994

Schedule of RSU activity

		Weighted		Weighted
		average		average	Aggregate
	Number	grant date		contractual	intrinsic
	of shares	fair value		term	value
Outstanding at December 31, 2019	—	$	—
Granted	150,295		32.80
Released	—		—
Forfeited	(152)		—
Outstanding at June 30, 2020	150,143	$	32.79	3.7	$	12,353,766

Schedule of stock-based compensation expense

	Three months ended June 30,				Six months ended June 30,
	2020		2019		2020		2019
Research and development	$	1,037,530	$	264,731	$	1,671,905	$	366,432
General and administrative		3,110,495		623,825		4,609,650		1,778,434
Total	$	4,148,025	$	888,556	$	6,281,555	$	2,144,866

Schedule of warrant activity

		Weighted
		average
	Warrants	exercise price
Outstanding at December 31, 2019	69,656	$	7.21
Issued	—		—
Exercised	(32,614)		7.41
Outstanding at June 30, 2020	37,042	$	7.03