Capital Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands							3 Months Ended				9 Months Ended
	Jun. 30, 2021	Jan. 21, 2021	Dec. 10, 2020	Dec. 06, 2020	Oct. 21, 2020	Oct. 01, 2019	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Conversion of convertible preferred stock, shares (in shares)						1,315,790
Issuance of stock for services							$ 116	$ 274
Issuance costs	$ 896
Proceeds from stock issuance, net of issuance costs	$ 11,504										$ 11,504	$ 0
Issuance of common shares from warrant exercise (in shares)					521,500
Warrant term					2 years
Exercise price (in dollars per share)											$ 4.42		$ 4.85	$ 0.01
Warrant exercises											0
General and administrative expense
Class of Stock [Line Items]
Stock option compensation expense											$ 390
Warrants
Class of Stock [Line Items]
Issuance of common shares from warrant exercise (in shares)				625,000
Warrant term				2 years
Exercise price (in dollars per share)				$ 5.49	$ 4.08
Warrants | Public Offering
Class of Stock [Line Items]
Number of shares issued (in shares)	1,000,000
Warrants | Private Placement
Class of Stock [Line Items]
Number of shares issued (in shares)	3,000,000
Common Stock
Class of Stock [Line Items]
Conversion of convertible preferred stock, shares (in shares)									25,000	50,000	18,846,411	75,000
Shares issued for stock based compensation (in shares)											200,000	23,334
Issuance of shares for professional service fees (in shares)		21,008	50,000					21,008
Issuance of stock for services		$ 100	$ 348
Common Stock | Public Offering
Class of Stock [Line Items]
Number of shares issued (in shares)	4,000,000
Sale of stock, price per share (in dollars per share)											$ 4.00
Common Stock | Private Placement
Class of Stock [Line Items]
Sale of stock, price per share (in dollars per share)											$ 4.40
Proceeds from issuance of common stock gross	$ 12,400
Series A Warrants
Class of Stock [Line Items]
Warrant term											6 months
Series B Warrants
Class of Stock [Line Items]
Warrant term											3 years