Earnings Per Share Applicable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net loss	$ (8,856)	$ (4,215)	$ (21,803)	$ (13,828)
Basic loss per common share (in dollars per share)	$ (0.13)	$ (0.07)	$ (0.33)	$ (0.23)
Diluted loss per common share (in dollars per share)	$ (0.13)	$ (0.07)	$ (0.33)	$ (0.23)
Basic weighted average common shares outstanding (in shares)	68,236	61,695	66,811	60,797
Diluted weighted average common shares outstanding (in shares)	68,236	61,695	66,811	60,797
Potentially dilutive securities:
Nonvested shares of restricted stock	200	200	200	200
Stock option
Potentially dilutive securities:
Stock options	10,540	11,466	10,540	11,466
Restricted stock units	116	0	116	0