Net Loss Attributable to Common Stockholders Per Share (Schedule of Basic and Diluted Net Loss Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator
Net loss attributable to common stockholders, basic	$ (21,566)	$ (20,403)	$ (68,739)	$ (53,992)
Net loss attributable to common stockholders, diluted	$ (21,566)	$ (20,403)	$ (68,739)	$ (53,992)
Denominator
Weighted-average shares used to compute net income per share, basic (in shares)	68,384,115	67,213,282	68,024,937	66,428,303
Weighted-average shares used to compute net income per share, diluted (in shares)	68,384,115	67,213,282	68,024,937	66,428,303
Net loss per share
Net loss per share attributable to common stockholders, basic (in dollars per share)	$ (0.32)	$ (0.30)	$ (1.01)	$ (0.81)
Net loss per share attributable to common stockholders, diluted (in dollars per share)	$ (0.32)	$ (0.30)	$ (1.01)	$ (0.81)