Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CONSOLIDATED BALANCE SHEETS
Preferred stock, par value	$ 0.0001		$ 0.0001	$ 0.0001		$ 0.0001
Preferred stock, shares authorized	41,692,230		41,692,230			37,932,831
Preferred stock, issued	41,587,368		41,587,368			32,653,742
Preferred stock, outstanding	41,587,368		41,587,368	41,692,230		32,653,742
Common shares, par value, (per share)	$ 0.0001		$ 0.0001	$ 0.0001		$ 0.0001
Common shares, shares authorized	74,666,115		74,666,115			61,057,864
Common shares, shares issued	4,595,168		2,765,097			8,396,425
Common shares, shares outstanding	4,595,168	4,488,416	2,765,097	8,544,436	8,468,742	8,396,425	8,273,865

Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

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