Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2019

Computation of Diluted Net Loss Per Share does not Assume Issuance of Common Shares that have an Anti-dilutive Effect on Net Loss Per Share

The computation of diluted net loss per share does not assume the issuance of common shares that have an anti-dilutive effect on net loss per share.

	Year Ended December 31,
	(in thousands, except per share amounts)
	2019			2018
Net loss	$	(13,294	)	$	(13,900	)
Preferred stock dividends		(263	)		(1,147	)
Warrant modification		(6,622	)		—
Net loss applicable to common stockholders	$	(20,179	)	$	(15,047	)
Basic and diluted net loss per share	$	(0.39	)	$	(0.38	)
Shares used in computing basic and diluted net loss per share		52,238			39,414

Dilutive Shares Which Could Exist Pursuant to Exercise of Outstanding Stock Instruments and Which were not Included in Calculation

Dilutive shares which could exist pursuant to the exercise of outstanding stock instruments and which were not included in the calculation because their affect would have been anti-dilutive are as follows:

	Year Ended December 31,
	2019 (Shares)		2018 (Shares)
Warrants to purchase shares of common stock		12,538,204		10,647,026
Options to purchase shares of common stock		3,000,256		2,713,979
Shares of common stock issuable upon conversion preferred stock		514,590		4,303,948
	16,053,050		17,664,953