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Condensed Balance Sheets - (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Convertible preferred stock
Shares outstanding (in shares)	0	532,606,084
Preferred stock
Par value (in dollars per share)	$ 0.001	$ 0.001
Shares authorized (in shares)	10,000,000	0
Shares issued (in shares)	0	0
Shares outstanding (in shares)	0	0
Common stock
Par value (in dollars per share)	$ 0.001	$ 0.001
Shares authorized (in shares)	200,000,000	1,470,000,000
Shares issued (in shares)	12,560,990	63,005
Shares outstanding (in shares)	12,560,990	63,005
Redeemable Convertible Preferred Stock
Convertible preferred stock
Par value (in dollars per share)	$ 0.001	$ 0.001
Shares authorized (in shares)	750,300,000	750,300,000
Shares outstanding (in shares)		532,606,084
Liquidation preference	$ 0	$ 163,316
Shares issued (in shares)	0

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