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Redeemable Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended			9 Months Ended
	Sep. 23, 2019	Jul. 31, 2019	Jan. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Temporary Equity [Line Items]
Deemed dividend recognized for beneficial conversion features of Series H redeemable convertible preferred stock				$ 6,741
Temporary equity, deemed dividend				$ (6,860)
Redeemable convertible preferred stock outstanding (in shares)				0	681,534,421	630,252,373		0		532,606,084
Common Stock
Temporary Equity [Line Items]
Stock issued upon conversion of redeemable convertible preferred shares (in shares)				7,816,643
Common Stock | IPO
Temporary Equity [Line Items]
Stock issued upon conversion of redeemable convertible preferred shares (in shares)	7,816,643
Series G redeemable convertible preferred stock
Temporary Equity [Line Items]
Sale of temporary equity, price per share (in dollars per share)			$ 0.078		$ 0.078	$ 0.078
Series H redeemable convertible preferred stock
Temporary Equity [Line Items]
Sale of temporary equity, price per share (in dollars per share)		$ 0.04712		$ 0.047
Deemed dividend recognized for beneficial conversion features of Series H redeemable convertible preferred stock				$ 6,700			$ 0	$ 6,741
Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Redeemable convertible preferred stock outstanding (in shares)									0

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Sale of Temporary Equity, Price Per Share

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Number of shares issued during the period as a result of the conversion of convertible securities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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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.

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