Common Stock and Preferred Stock (Tables)

3 Months Ended

Mar. 31, 2022

Earnings Per Share [Abstract]

Schedule of basic and diluted net loss per share

Basic and diluted net loss per common share (in thousands, except per share amounts) was as follows:

	Three Months Ended March 31,
	2022		2021
Net loss	$	(14,645)	$	(5,493)
Dividends on preferred stock - declared and undeclared	(2,239)		(2,239)
Net loss attributable to common stockholders	$	(16,884)	$	(7,732)
Weighted-average shares of common stock outstanding	20,723		17,622
Net loss per common share - basic and diluted	$	(0.81)	$	(0.44)

Schedule of shares excluded from net loss per share

The following common equivalent shares as of March 31, 2022 and 2021, issuable upon exercise of stock options and warrants, have been excluded from the diluted earnings per share calculation as their effect was anti-dilutive:

	March 31,
	2022	2021
Warrants to purchase common stock	167,496	1,312,250
Options to purchase common stock	3,505,469	3,507,395
Total	3,672,965	4,819,645