Common Stock and Noncontrolling Interest in Subsidiaries - Additional Information (Details) - USD ($)	1 Months Ended					3 Months Ended			6 Months Ended	9 Months Ended
	Jul. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Jul. 31, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Dividends declared						$ 0				$ 0
Common stock, voting rights										Each share of common stock entitles the holder to one vote and to receive dividends when and if declared by the board of directors of the Company.
Shares sold/issued						45,743,027				45,743,027		44,292,102
Losses attributed to noncontrolling interests						$ (86,000)	$ (909,000)			$ (1,713,000)	$ (223,000)
HLBV
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Losses attributed to noncontrolling interests						100,000
Common Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Additional shares issued								13,685,000
Noncontrolling Interest in Subsidiaries | HLBV
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Losses attributed to noncontrolling interests										$ 100,000
License Agreement between Amber and Massachusetts Institute of Technology | Common Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Additional consideration received					$ 0				$ 0
Maximum | Noncontrolling Interest in Subsidiaries | HLBV
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Losses attributed to noncontrolling interests							100,000				100,000
Cullinan Amber Corp | License Agreement between Amber and Massachusetts Institute of Technology | Common Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Shares issued		300,000							300,000
Shares sold/issued					200,000
Cullinan Amber Corp | Series A Preferred Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Shares issued		6,000,000.0			3,000,000.0				6,000,000.0
Gross proceeds		$ 6,000,000.0			$ 3,000,000.0
Percentage of share purchased as part of asset acquisition										93.50%
Ownership interest percentage										6.50%
Cullinan Florentine Corp | HLBV
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Losses attributed to noncontrolling interests						0	0			$ 0	0
Cullinan Florentine Corp | Series A Preferred Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Percentage of share purchased as part of asset acquisition										95.60%
Ownership interest percentage										4.40%
Cullinan Florentine Corp | Series B Preferred Units
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Gross proceeds	$ 4,100,000			$ 8,100,000
Additional shares issued	3,750,000			7,500,000
MICA | HLBV
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Losses attributed to noncontrolling interests						$ 100	(300,000)			$ 1,200,000	(800,000)
MICA | Series A Senior Preferred Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Gross proceeds			$ 8,800,000		$ 7,100,000
Percentage of share purchased as part of asset acquisition										53.50%
Ownership interest percentage										46.50%
Purchase of shares			6,700,000		5,400,000
MICA | Series A Senior Preferred Stock | Other Existing Investors
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Gross proceeds			$ 1,200,000		$ 900,000
Purchase of shares			900,000		700,000
Cullinan Pearl Corp | HLBV
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Losses attributed to noncontrolling interests							$ (600,000)			$ (300,000)	$ 700,000