Warrants for Convertible Preferred Stock (Tables)

9 Months Ended

Sep. 30, 2020

Warrants And Rights Note Disclosure [Abstract]

Summary of Activity for Convertible Preferred Stock Warrants Outstanding

The following table presents the activity for convertible preferred stock warrants outstanding (in thousands, except weighted average exercise price):

	Series E						Series G
	Warrants			Weighted Average Exercise price			Warrants		Weighted Average Exercise price
Outstanding ‑ December 31, 2019		925		$	5.00			613	$	0.75
Granted		—			—			—		—
Forfeited/canceled		(925	)		(5.00	)		—		—
Exercised		—			—			—		—
Outstanding ‑ September 30, 2020		—		$	—			613	$	0.75
Weighted average remaining contractual life at    September 30, 2020							7.5 years