Equity Securities

3 Months Ended

Mar. 31, 2022

Equity [Abstract]

Equity Securities

6. Equity Securities  

Potentially Dilutive Common Stock Equivalents

As of March 31, 2022 and 2021, we excluded the potentially dilutive securities summarized below, which entitle the holders thereof to potentially acquire shares of common stock, from our calculations of net loss per share and weighted average common shares outstanding, as their effect would have been anti-dilutive (in thousands).

	March 31,
	2022		2021
Common stock warrants issued to underwriter		10		10
Common stock warrants issued in rights offerings		7,681		7,682
Common stock options		180		182
		7,871		7,874