Net Loss Per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
Net Loss Per Share (Details) - shares shares in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Amount of weighted-average anti-dilutive common shares	3,660	417	2,253	418
Convertible debt
Amount of weighted-average anti-dilutive common shares	0	108		108
Restricted stock
Amount of weighted-average anti-dilutive common shares	19	0	6
Warrant
Amount of weighted-average anti-dilutive common shares	2,949	279	1,651	279
Employee Stock Option
Amount of weighted-average anti-dilutive common shares	692	30	596	31