Redeemable Convertible Preferred Stock - Summary of Redeemable Convertible Preferred Stock (Details) $ / shares in Units, $ in Thousands	Dec. 31, 2019 USD ($) $ / shares shares
Temporary Equity [Line Items]
Shares Authorized	99,363,444	[1]
Shares Issued and Outstanding	97,166,921	[1]
Carrying Value | $	$ 114,083
Liquidation Preference | $	$ 128,195
Common Stock Issued Upon Conversion (1)	12,048,671	[1]
Series A Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized	37,104,185	[1]
Original Issue Price | $ / shares	$ 1.20
Shares Issued and Outstanding	37,104,185	[1]
Carrying Value | $	$ 35,960
Liquidation Preference | $	$ 44,525
Common Stock Issued Upon Conversion (1)	4,600,920	[1]
Series A-1 Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized	629,633	[1]
Original Issue Price | $ / shares	$ 1.20
Shares Issued and Outstanding	629,633	[1]
Carrying Value | $	$ 447
Liquidation Preference | $	$ 756
Common Stock Issued Upon Conversion (1)	78,074	[1]
Series A-2 Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized	2,428,688	[1]
Original Issue Price | $ / shares	$ 1.20
Shares Issued and Outstanding	2,428,688	[1]
Carrying Value | $	$ 1,749
Liquidation Preference | $	$ 2,914
Common Stock Issued Upon Conversion (1)	301,157	[1]
Series B Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized	59,200,938	[1]
Original Issue Price | $ / shares	$ 1.40
Shares Issued and Outstanding	57,004,415	[1]
Carrying Value | $	$ 75,927
Liquidation Preference | $	$ 80,000
Common Stock Issued Upon Conversion (1)	7,068,520	[1]

[1] ⁽¹⁾ Adjusted to reflect the Exchange Ratio.