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Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares
Series G redeemable convertible preferred stock
Sale of temporary equity, price per share (in dollars per share) | $ / shares	$ 0.078
Issuance costs | $	$ 124
Series H redeemable convertible preferred stock
Sale of temporary equity, price per share (in dollars per share) | $ / shares	$ 0.047
Issuance costs | $	$ 318

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