Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares
Class Of Stock [Line Items]
Unamortized stock-based compensation expense | $	$ 30.9
Weighted-average period over which unrecognized compensation cost is expected to be recognized	2 years 9 months 29 days
Class of warrant exercise price | $ / shares	$ 4.50
Class of warrant exercisable period	5 years
Class of warrant exercisable period ends	2023-09
Warrants issued or issuable | shares	0
2019 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Unamortized stock-based compensation expense | $	$ 1.5
Weighted-average period over which unrecognized compensation cost is expected to be recognized	12 months
Expected volatility of option granted	88.40%
Risk-free interest rate, minimum	0.12%
Risk-free interest rate, maximum	0.13%
Expected dividend yield	0.00%
Restricted Stock Units
Class Of Stock [Line Items]
Unamortized stock-based compensation expense | $	$ 63.4
Weighted-average period over which unrecognized compensation cost is expected to be recognized	3 years 8 months 1 day
Number of other than options granted | shares	130,715
Weighted grant-date fair value | $ / shares	$ 93.97
Minimum | 2019 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Expected term of stock options granted	6 months
Minimum | Restricted Stock Units
Class Of Stock [Line Items]
Vest over requisite period	1 year
Maximum
Class Of Stock [Line Items]
Issuance of warrants | shares	5,600,000
Maximum | 2019 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Expected term of stock options granted	1 year
Maximum | Restricted Stock Units
Class Of Stock [Line Items]
Vest over requisite period	4 years