Stockholders' Equity - Stock Warrants - Additional Information (Details) - shares	1 Months Ended
	Jul. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 02, 2017	Oct. 01, 2017
Class Of Warrant Or Right [Line Items]
Preferred stock, shares outstanding		0	0
Outstanding warrants		0	0
Class B Common Stock
Class Of Warrant Or Right [Line Items]
Outstanding warrants to purchase				200,000
Warrants exercised				1,900,000
Warrants cancelled				100,000
Warrants issued				1,800,000
Initial Public Offering | Class B Common Stock
Class Of Warrant Or Right [Line Items]
Outstanding warrants to purchase					2,200,000
Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Preferred stock, shares outstanding						2,200,000
Common Stock Warrants | Class B Common Stock
Class Of Warrant Or Right [Line Items]
Conversion of common stock warrants	400,000
Number of common stock warrants exercise	400,000