Loss per Common Share (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Schedule of Potential Common Shares Issuable Pursuant to Outstanding Securities Excluded from Computation of Diluted Loss per Common Share

The following table represents the potential common shares issuable pursuant to outstanding securities as of the related period end dates that were excluded from the computation of diluted loss per common share because their inclusion would have had an anti-dilutive effect (in thousands):

	Three months ended March 31,
	2020		2019
Warrants to purchase shares of common stock		208		218
Convertible preferred stock		19,714		16,331
Options to purchase shares of common stock		7,960		4,005
Outstanding securities not included in    calculations		27,882		20,554