Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Basic	$ (5,099)	$ (8,923)	$ (86,497)	$ (33,548)
Adjustments for change in fair value of warrant liability	(2,692)
Diluted	$ (7,791)	$ (8,923)	$ (86,497)	$ (33,548)
Denominator:
Basic	96,839,292	35,809,973	92,544,137	35,294,839
Dilutive effect of warrants	706,650
Diluted	97,545,942	35,809,973	92,544,137	35,294,839
Net loss attributable per share to common stockholders:
Loss per share - basic	$ (0.05)	$ (0.25)	$ (0.93)	$ (0.95)
Loss per share - diluted	$ (0.08)	$ (0.25)	$ (0.93)	$ (0.95)