Convertible preferred stock and members's/stockholders' equity (deficit) - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended				12 Months Ended
	Jan. 01, 2021	Jul. 13, 2020	Sep. 30, 2021	Jul. 31, 2020	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class Of Stock [Line Items]
Preferred Stock Shares Issued							0	0
Payments to minority shareholders							$ 0	$ 19	$ 5
Proceeds From Issuance Of Convertible Preferred Stock							0	68,183	0
Proceeds from initial public offering, net of issuance costs							$ 0	$ 200,229	$ 0
Common Stock, Shares, Issued				6,220,050			35,799,233	32,171,560
Preferred Stock, Shares Authorized							200,000,000	200,000,000
Preferred Stock, Par or Stated Value Per Share							$ 0.0001	$ 0.0001
Common Stock, Shares Authorized							350,000,000	350,000,000
Common Stock, Par or Stated Value Per Share							$ 0.0001	$ 0.0001
Conversion of stock, description							Holders of the Company’s common stock have no conversion rights, while holders of the Company’s Class B common stock shall have the right to convert each share of Class B common stock into one share of common stock at such holder’s election, provided that as a result of such conversion, such holder would not beneficially own in excess of 4.99% of any class of the Company’s securities registered under the Securities Exchange Act of 1934
Period related to changing of ownership limitation percentage designated by Class B common stock holder							61 days
Warrants Expired And Unexercised							566,586
Annual rate of purchase price per share						7.00%
Net loss of HTKY allocated to noncontrolling interest								$ 61,000
Fair value of options, vested							$ 1,900
Vested								(1,310,807)
Total number of common shares reserved for issuance							6,247,701	6,122,181
Equity Option
Class Of Stock [Line Items]
Vested								0	0
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount							$ 15,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition							3 years 1 month 6 days
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value							$ 24.61	$ 11.66
Restricted Stock Units (RSUs)
Class Of Stock [Line Items]
Common Stock, Shares, Issued							2,061,948	2,535,143
Number of outstanding shares							975,046	1,920,037	0
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount							$ 17,500
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition							2 years 2 months 12 days
Private Placement of Common Stock [Member]
Class Of Stock [Line Items]
Sale of stock price per share			$ 28.00
Common Stock, Shares, Issued			2,678,600
Proceeds from the Private Placement, net of underwriting discounts and commissions and other offering costs			$ 71,000
2020 Equity Incentive Plan [Member]
Class Of Stock [Line Items]
Common shares authorized for issuance							6,226,540	4,939,678
Shares available for awards, description	4
Vesting percentage							25.00%
Vesting period							36 months
Vesting terms, description							ten years
Employees Stock Purchase Plan [Member]
Class Of Stock [Line Items]
Common Stock, Shares, Issued							11,182
Common Stock, Shares Authorized							833,993	464,829
Purchase common stock through payroll deductions of up to compensations, percent							15.00%
Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Outstanding Stock Maximum							1.00%
Increase in issuance of common stock							929,658
Total number of common shares reserved for issuance							822,811
Himalaya Therapeutics S E Z C
Class Of Stock [Line Items]
Purchase of ordinary shares					5,000,000	19,000,000
Payments to minority shareholders					$ 5,000	$ 19,000
IPO
Class Of Stock [Line Items]
Sale of stock issued in transaction								12,075,000
Sale of stock price per share								$ 18.00
Proceeds from initial public offering, net of issuance costs								$ 198,300
Vesting period							365 days
Vesting terms, description							The warrants became exercisable upon our IPO for a period of 365 and 450 days
Series D Convertible Preferred Stock
Class Of Stock [Line Items]
Preferred Stock Shares Issued		140,626,711		59,164,808
Subsequent sale of convertible preferred stock to new investors, Shares				140,626,711
Convertible preferred stock, per share		$ 0.51554931
Proceeds From Issuance Of Convertible Preferred Stock		$ 72,500
Convertible preferred stock, issuance costs		$ 4,300
Common Stock, Shares, Issued				59,164,808
Convertible Preferred Stock [Member] | IPO
Class Of Stock [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion								199,791,519
Common Stock, Shares, Issued								13,876,510
Class B Common Stock
Class Of Stock [Line Items]
Common Stock, Shares, Issued							1,492,059	1,492,059
Common Stock, Shares Authorized							15,368,569	15,368,569
Common Stock, Par or Stated Value Per Share							$ 0.0001	$ 0.0001
Vesting period							4 years
Class B Common Stock | IPO
Class Of Stock [Line Items]
Common Stock, Shares, Issued								1,492,059
Series B Convertible Preference Shares [Member]
Class Of Stock [Line Items]
Number of shares, held of outstanding HTKY preferred equity									97,183,256
Minimum per share amount of convertible preference shares liquation preference									$ 1.00
Common Stock
Class Of Stock [Line Items]
Common stock, voting rights							one
Number of shares, held of outstanding HTKY preferred equity									1,000