Net (Loss) Income Per Share Attributable To Common Stockholders - Summary of Potentially Dilutive Securities Excluded from Diluted Net Loss Per Share Calculation (Details) - shares shares in Thousands	6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities, potentially dilutive securities excluded from calculation of diluted net loss per share	12,188	57,889
Convertible Preferred Stock as-Converted
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities, potentially dilutive securities excluded from calculation of diluted net loss per share		51,344
Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities, potentially dilutive securities excluded from calculation of diluted net loss per share	12,126	6,458
Warrants to Purchase Redeemable Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities, potentially dilutive securities excluded from calculation of diluted net loss per share		64
Warrants to Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities, potentially dilutive securities excluded from calculation of diluted net loss per share	62	23