Equity-based compensation - Legacy Stock Options Warrants (Details) - Stock options and warrants - $ / shares	9 Months Ended	12 Months Ended
Sep. 30, 2022	Dec. 31, 2021
Legacy BioPharmXOptions
Shares Underlying Options
Outstanding, end of period (in shares)	316
Weighted Average Exercise Price
Outstanding, end of period (in dollars per share)	$ 3,763.55
Weighted Average Remaining Contractual Term (Years)
Weighted Average Remaining Contractual Life (in Years)	7 months 6 days
Legacy BioPharmXWarrants
Shares Underlying Options
Outstanding, beginning of period (in shares)	4,280
Shares Underlying Options and Warrants, Expired	(44)
Outstanding, end of period (in shares)	4,235	4,280
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 4,360.50
Weighted Average Exercise Prices, Expired	11,250.00
Outstanding, end of period (in dollars per share)	$ 4,288.50	$ 4,360.50
Weighted Average Remaining Contractual Term (Years)
Weighted Average Remaining Contractual Life (in Years)	1 year 14 days	1 year 9 months 18 days

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- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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