The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(27)(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Redeemable Convertible Preferred Stock - Schedule of Redeemable Convertible Preferred Stock (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	May 31, 2020	Dec. 31, 2019
Temporary Equity [Line Items]
Shares Authorized	0			32,225,227
Shares Issued	0			31,968,570
Shares Outstanding	0	0	31,968,570	31,968,570
Net Carrying Value				$ 54,170
Liquidation Value	$ 0			$ 54,415
Series A Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized				6,299,019
Shares Issued				6,221,977
Shares Outstanding				6,221,977
Net Carrying Value				$ 8,777
Liquidation Value				$ 8,885
Series B Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized				11,270,319
Shares Issued				11,090,726
Shares Outstanding				11,090,726
Net Carrying Value				$ 18,474
Liquidation Value				$ 18,530
Series C Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized				14,655,889
Shares Issued				14,655,867
Shares Outstanding				14,655,867
Net Carrying Value				$ 26,919
Liquidation Value				$ 27,000