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The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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Notes Receivable - Additional Information (Detail) $ / shares in Units, shares in Millions								9 Months Ended	12 Months Ended
	Sep. 14, 2021 USD ($)	May 14, 2021 USD ($)	May 11, 2021 USD ($)	Dec. 03, 2020 USD ($)	Apr. 17, 2020 USD ($) shares	Apr. 17, 2020 GBP (£)	Jan. 03, 2020 USD ($) $ / shares	Sep. 30, 2021	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2021 € / shares	Jun. 07, 2021 € / shares	Mar. 08, 2021 USD ($)	Dec. 31, 2020 € / shares	Dec. 03, 2020 GBP (£)	Apr. 17, 2020 GBP (£) shares	Nov. 06, 2019 USD ($)	Nov. 06, 2019 GBP (£)	Sep. 27, 2019 USD ($)	Sep. 27, 2019 GBP (£)
Notes Receivable [Line Items]
Payments to acquire notes receivable										$ 1,916,000
Proceeds from issuance of equity		$ 3,000,000.0
Issuance of common stock shares par value \| (per share)									$ 0.12	$ 0.12			€ 0.10	€ 0.10		€ 0.10
Amended and Restated Loan Agreement [Member]
Notes Receivable [Line Items]
Loan agreement	$ 6,000,000.0
Term Loan Receivable [Member]
Notes Receivable [Line Items]
Loans and lease receivable, Outstanding									$ 2,500,000
Loans Receivable [Member]
Notes Receivable [Line Items]
Receivables, Maturity description								On May 14, 2021, the Company amended the Term Loans under which the Maturity Date will be the first business day following the first closing of a subscription for additional units if the proceeds from such subscription amount to at least $3.0 million.
Compass Shareholder [Member]
Notes Receivable [Line Items]
Receivable, Face amount				$ 900,000													£ 700,000
Payments to acquire notes receivable											$ 7,800,000	£ 6,200,000
Receivables, Interest rate				0.00%
Receivables, Due date				Apr. 01, 2022
Receivables, Termination									2021-04
Securities Issued Upon Qualified Equity Financing																			$ 33,200,000	£ 25,000,000
Securities Issued Upon Non-Qualified Equity Financing																			33,200,000	25,000,000
Discount To Price Per Share Paid For Preferred Shares					15.00%	15.00%
Conversion Price					$ 3,181													£ 2,397
Notes Receivable, Fair Value Disclosure					700,000
Compass Shareholder [Member] \| Notes Receivable Related Parties Current [Member]
Notes Receivable [Line Items]
Due from related party, Current										$ 900,000
Compass Shareholder [Member] \| Series B Preferred Stock [Member]
Notes Receivable [Line Items]
Payments to acquire notes receivable					$ 7,600,000	£ 6,200,000
Convertible promissory notes, interest rate					85.00%													85.00%
Preferred stock \| shares					49.8													49.8
Notes Receivable, Fair Value Disclosure					$ 9,000,000.0
Acquired notes receivable fair value disclosure					$ 1,654													£ 1,350
IntelGenx Corp [Member]
Notes Receivable [Line Items]
Loans receivable, Fixed interest rate									8.00%
IntelGenx Corp [Member] \| Additional Term Loan And March Term Loan [Member]
Notes Receivable [Line Items]
Payments to acquire notes receivable			$ 500,000
IntelGenx Corp [Member] \| March Term Loan Receivable [Member]
Notes Receivable [Line Items]
Receivable, Face amount															$ 2,000,000.0
IntelGenx Corp [Member] \| Additional Term Loan Receivable [Member]
Notes Receivable [Line Items]
Receivable, Face amount															$ 500,000
IntelGenx Corp [Member] \| Additional Term Loan Receivable [Member] \| Amended and Restated Loan Agreement [Member]
Notes Receivable [Line Items]
Receivable, Face amount	6,000,000.0
IntelGenx Corp [Member] \| Additional Term Loan Receivable [Member] \| First Tranche [Member] \| Amended and Restated Loan Agreement [Member]
Notes Receivable [Line Items]
Receivable, Face amount	3,000,000.0
IntelGenx Corp [Member] \| Additional Term Loan Receivable [Member] \| Second Tranche [Member] \| Amended and Restated Loan Agreement [Member]
Notes Receivable [Line Items]
Receivable, Face amount	3,000,000.0
IntelGenx Corp [Member] \| Term Loan Receivable [Member]
Notes Receivable [Line Items]
Receivable, Face amount	$ 8,500,000
Receivables, Maturity terms								120 days
IntelGenx Corp [Member] \| Term Loan Receivable [Member] \| Amended and Restated Loan Agreement [Member]
Notes Receivable [Line Items]
Term loan maturity date	Jan. 05, 2024
DemeRx IB, Inc. [Member] \| Minimum [Member]
Notes Receivable [Line Items]
Debt Instrument, interest rate increase							6.00%
DemeRx IB, Inc. [Member] \| Maximum [Member]
Notes Receivable [Line Items]
Debt Instrument, interest rate increase							11.00%
Promissory Note Agreement [Member]
Notes Receivable [Line Items]
Convertible promissory notes issued \| £																						£ 3,000,000.0
Promissory Note Agreement [Member] \| Compass Shareholder [Member]
Notes Receivable [Line Items]
Convertible promissory notes issued																			$ 4,200,000	£ 3,200,000	$ 4,000,000.0
Convertible promissory notes, interest rate									3.00%
Promissory Note Agreement [Member] \| DemeRx [Member]
Notes Receivable [Line Items]
Payments to acquire notes receivable							$ 1,000,000.0
Receivables, Maturity terms							360 days
Debt Instrument, interest rate of unpaid principal balance							6.00%
Debt Instrument, face amount inclusive other payments							$ 1,000,000.0
Debt Instrument, Description							the aggregate principal amount of $1.0 million together with all accrued and unpaid interest and any other amounts payable are due to be paid on the date that is the earlier of (i) 5 years from the initial closing and (ii) the closing of an initial public offering or a deemed liquidation event of DemeRx IB (the “DemeRx Maturity Date”)
DemeRx Note [Member] \| DemeRx IB, Inc. [Member]
Notes Receivable [Line Items]
Issuance of common stock shares par value \| $ / shares							$ 0.0001
DemeRx Note [Member] \| DemeRx [Member]
Notes Receivable [Line Items]
Loans and lease receivable, Outstanding									$ 1,100,000	$ 1,100,000