Convertible Preferred Stock - Summary of Convertible Preferred Stock (Details) - USD ($)				12 Months Ended
	Jan. 31, 2020	Sep. 30, 2016	Aug. 31, 2015	Dec. 31, 2020
Temporary Equity [Line Items]
Shares Authorized				135,936,731
Shares Issued and Outstanding				114,686,731
Aggregate Liquidation Amount				$ 100,187,000
Proceeds from Issuance of Redeemable Convertible Preferred Stock				99,414,000
Net Carrying Value				$ 86,706,000
Series A
Temporary Equity [Line Items]
Shares Authorized				17,000,000
Shares Issued and Outstanding				17,000,000
Per Share Liquidation Preference				$ 1.00
Aggregate Liquidation Amount				$ 17,000,000
Proceeds from Issuance of Redeemable Convertible Preferred Stock		$ 5,000,000	$ 2,000,000	16,982,000
Net Carrying Value				$ 16,982,000
Series B
Temporary Equity [Line Items]
Shares Authorized				25,186,738
Shares Issued and Outstanding				25,186,738
Per Share Liquidation Preference				$ 1.00
Aggregate Liquidation Amount				$ 25,187,000
Proceeds from Issuance of Redeemable Convertible Preferred Stock				24,943,000
Net Carrying Value				$ 12,235,000
Series B-1
Temporary Equity [Line Items]
Shares Authorized				93,749,993
Shares Issued and Outstanding				72,499,993
Per Share Liquidation Preference				$ 0.80
Aggregate Liquidation Amount				$ 58,000,000
Proceeds from Issuance of Redeemable Convertible Preferred Stock	$ 35,000,000			57,489,000
Net Carrying Value				$ 57,489,000