Convertible Preferred Stock and Stockholders' Equity - Summary of Unvested Shares and Unvested Stock Liability (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) shares
Equity [Abstract]
Number of Unvested Shares, Beginning balance | shares	197,549
Number of Unvested Shares, Repurchased shares | shares	(4,269)
Number of Unvested Shares, Vested shares | shares	(145,360)
Number of Unvested Shares, Ending balance | shares	47,920
Unvested Stock Liability, Beginning balance | $	$ 109
Unvested Stock Liability, Repurchased shares | $	(2)
Unvested Stock Liability, Vested shares | $	(73)
Unvested Stock Liability, Ending balance | $	$ 34