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Unaudited Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Mar. 31, 2018
Series F redeemable convertible preferred stock
Sale of temporary equity, price per share (in dollars per share)				$ 0.078
Issuance costs				$ 7
Series G redeemable convertible preferred stock
Sale of temporary equity, price per share (in dollars per share)		$ 0.078	$ 0.078
Issuance costs		$ 28	$ 96
Series H redeemable convertible preferred stock
Sale of temporary equity, price per share (in dollars per share)	$ 0.047
Issuance costs	$ 318

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