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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Dec. 31, 2020	Aug. 31, 2020	Dec. 31, 2019
Stockholders Equity Note [Line Items]
Common stock, no par value	$ 0						$ 0	$ 0
Proceeds from issuance of stock options							$ 24
Equity Incentive Plan
Stockholders Equity Note [Line Items]
Shares issuable under Stock Option Plan, as percent of shares outstanding							25.00%
Vesting period							3 years
Expiration term							10 years
Stock Option In Canadian Dollars [Member]
Stockholders Equity Note [Line Items]
Options outstanding				0	648	648			0	648
Exercise of options (in shares)				648	0	0
Number of Options Granted				0	0	0
Stock Option In Us Dollars [Member]
Stockholders Equity Note [Line Items]
Options outstanding	3,653	3,653	2,952				3,653	2,952
Exercise of options (in shares)	0	4	0
Number of stock options forfeited (in shares)		50
Number of Options Granted	0	755	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	2,586						2,586
U.S.dollars [Member]
Stockholders Equity Note [Line Items]
Class Or Warrant Or Right Outstanding Weighted Average Remaining Contractual Terms							7 years 4 months 6 days
Maximum | Equity Incentive Plan
Stockholders Equity Note [Line Items]
Shares issuable under Stock Option Plan	6,502						6,502

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