Convertible and other debt - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2018	Apr. 30, 2018	Dec. 31, 2015	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Apr. 30, 2020	Aug. 31, 2018
Debt Instrument [Line Items]
interest expense				$ 3	$ 1,389	$ 1,630
Conversion price description		The 2018 Notes were amended in April 2020 to add a discount to the conversion prices such that they were convertible (i) automatically into preferred stock upon a qualified equity financing, with a conversion price of 80% of the lowest purchase price per share of preferred stock paid by investors in such qualified equity financing, (ii) automatically convert into common stock upon an initial public offering, with a conversion price of 80% of the price per share of common stock paid by investors in such initial public offering, and (iii) upon the election of each note holder, into Class C preferred units, with a conversion price per share of $2.7153136.				The 2019 Notes were convertible (i) automatically into preferred stock upon a qualified equity financing, with a conversion price of 80% of the lowest purchase price per share of preferred stock paid by investors in such qualified equity financing, (ii) automatically into common stock upon an initial public offering, with a conversion price of 80% of the price per share of common stock paid by investors in such initial public offering, and (iii) upon the election of each note holder, into Class C preferred units, with a conversion price per share of $2.7153136.
Gain (loss) on extinguishment of long-term debt				690	(2,883)	$ 0
Other Debt
Debt Instrument [Line Items]
Debt Instrument Outstanding Principal Amount					$ 700
Debt Instrument, Decrease, Forgiveness				700
Amendment and settlement of convertible notes (class D units)
Debt Instrument [Line Items]
Conversion price					$ 0.51554931	$ 0.412439448
Promissory notes payable to aggregate principal amount					$ 21,800
accrued interest					4,700
Convertible notes carrying value					$ 27,900
Amendment and settlement of convertible notes (class D units) | Himalaya Parent L L C
Debt Instrument [Line Items]
Gain (loss) on extinguishment of long-term debt				2,700
Issuance of Series D convertible preferred stock in connection with settlement of convertible promissory notes, shares					59,164,808
Convertible note issued				30,600
Pfizer Notes
Debt Instrument [Line Items]
Fee paid to lenders			$ 500
interest expense					$ 600	$ 1,000
Pfizer Notes | Pfizer Inc
Debt Instrument [Line Items]
Accrued interest rate			8.00%
Conversion price			$ 3.394142
Pfizer Notes | Pfizer Inc | Unsecured Convertible Promissory Note
Debt Instrument [Line Items]
Note issued			$ 10,000
2018 Notes
Debt Instrument [Line Items]
Note issued	$ 5,000
Accrued interest rate								8.00%
Conversion price							$ 2.7153136	$ 3.394142
Fee paid to lenders						200
interest expense					$ 400	$ 400
Gain (loss) on extinguishment of long-term debt				$ (200)
amortization of debt discounts	$ 2,200
2019 Notes
Debt Instrument [Line Items]
Accrued interest rate						8.00%
Conversion price					$ 0.86866	$ 2.7153136
interest expense					$ 300	$ 100
derivative liability						1,800
Promissory notes payable to aggregate principal amount						4,000
Due to related parties						1,500
Additional paid-in capital and debt discount						$ 500
outstanding principal balance							$ 2,500
2020 Notes
Debt Instrument [Line Items]
Accrued interest rate					8.00%
interest expense					$ 100
derivative liability					1,200
Promissory notes payable to aggregate principal amount					2,800
Due to related parties					$ 500
maturity dates					December 7, 2020
outstanding principal balance					$ 100
outstanding principal plus accrued interest divided					$ 0.86866