Common Stock

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Common Stock

11. Common Stock

Warrants

  At September 30, 2021, warrants outstanding were not material.

Restricted Stock Awards (“RSAs”)

The following table summarizes RSA activity:

	RSAs Outstanding
	Number of RSAs (in thousands)			Weighted- Average Grant Date Fair Value Per Share
Balance—December 31, 2020		196		$	0.00034
Vested		(72	)		0.00034
Balance—September 30, 2021		124		$	0.00034

The fair value of RSAs vested during the nine months ended September 30, 2021 was $1.1 million.

At-the-Market Sales Agreement

In April 2021, we entered into an “at-the-market” sales agreement (the “2021 Sales Agreement”), with Cantor Fitzgerald & Co. and SVB Leerink LLC, through which we may offer and sell shares of our common stock having an aggregate offering of up to $75.0 million through Cantor Fitzgerald & Co. and SVB Leerink LLC, as our sales agents. We will pay the sales agents a commission of up to 3% of the gross proceeds of sales made through the 2021 Sales Agreement. In April 2021, we sold 2.2 million shares for $33.9 million in net proceeds under the 2021 Sales Agreement. We have $40.0 million remaining under the 2021 Sales Agreement, which is subject to the continued effectiveness of our shelf registration statement on Form S-3 (Registration No. 333-255099) that expires on April 7, 2024, or upon an effective replacement shelf registration statement.