Fair Value Measurements - Additional Information (Details) - Initial Public Offering	1 Months Ended
	Aug. 31, 2018 shares
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Warrants exercisable for convertible preferred stock	0
Warrants previously exercisable for preferred stock	37,200,000
Warrants expired on the effective date	35,700,000
Remaining warrants previously exercisable for preferred stock adjusted to become exercisable for common stock	1,500,000