Common Stock and Noncontrolling Interest in Subsidiaries - Additional Information (Details) - USD ($)		1 Months Ended									3 Months Ended
	May 28, 2020	Mar. 31, 2022	Jul. 31, 2021	Jun. 30, 2021	Dec. 31, 2020	Nov. 30, 2020	Aug. 31, 2020	May 31, 2020	Apr. 30, 2020	Feb. 28, 2019	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Common stock, shares authorized		150,000,000									150,000,000		150,000,000
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		44,660,026									44,660,026		44,292,102
Losses attributed to noncontrolling interests											$ (794,000)	$ 1,489,000
Note Purchase Agreement
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Issuance of convertible promissory note		$ 3,200,000
Common Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Additional shares issued												13,685,000
License Agreement between Amber and Massachusetts Institute of Technology
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Shares sold/issued				153,229					400,132
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
Taiho Ventures, LLC | Note Purchase Agreement
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Issuance of convertible promissory note		800,000
Maximum | Note Purchase Agreement
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Convertible promissory note to be issued		$ 6,000,000.0
Series A Preferred Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Shares issued				3,000,000
Gross proceeds				$ 3,000,000.0
Cullinan Amber Corp | Series A Preferred Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Shares issued									3,000,000
Gross proceeds									$ 3,000,000.0
Closing price per share									$ 1.00
Cullinan Amber Corp | Series A Preferred Stock | Maximum
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Sale of stock									9,000,000
Cullinan Apollo Corp
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Losses attributed to noncontrolling interests											0	$ 0
Cullinan Florentine Corp | DFKZ and UFE Anti-dilution Shares
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Additional shares issued			0
Cullinan Florentine Corp | HLBV
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Losses attributed to noncontrolling interests											$ 0	0
Cullinan Florentine Corp | Tubingen License Agreement
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Shares sold/issued							725,118
Cullinan Florentine Corp | Tubingen License Agreement | Common Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Additional consideration received							$ 0
Additional shares issued					381,810
Cullinan Florentine Corp | Tubingen License Agreement | Common Stock | DFKZ and UFE Anti-dilution Shares
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Additional consideration received					$ 0
Cullinan Florentine Corp | Series A Preferred Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Gross proceeds					$ 6,000,000.0		$ 6,000,000.0
Sale of stock							6,000,000
Closing price per share							$ 1.00
Additional shares issued					6,000,000
Cullinan Florentine Corp | Series A Preferred Stock | Maximum
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Sale of stock							6,000,000
Cullinan Florentine Corp | Series B Preferred Units
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Gross proceeds			$ 8,100,000
Additional shares issued			7,500,000
MICA
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Shares sold/issued					3,367,804
Shares price per share					$ 0.23
Equity at acquisition	$ 12,800,000
Aggregate purchase price					$ 800,000
Ownership interest percentage				45.00%							54.00%
MICA | HLBV
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Losses attributed to noncontrolling interests											$ 500,000	200,000
MICA | Series A Preferred Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Gross proceeds											8,800,000	$ 1,200,000
Additional purchased Preferred stock											$ 10,000,000.0
Additional shares issued				5,385,787
Purchase of shares											6,732,232	878,118
MICA | Series A Senior Preferred Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Shares issued								6,088,282
Gross proceeds				$ 7,100,000
Shares price per share								$ 1.31
Additional shares issued				702,495
Number of share purchased as part of asset acquisition								5,385,787
Equity at acquisition	7,100,000
MICA | Series A Senior Preferred Stock | Certain Existing Shareholders [Member]
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Gross proceeds				$ 900,000
MICA | Junior Preferred and Common Stockholders | Noncontrolling Interest in Subsidiaries
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Equity at acquisition	$ 5,700,000
Cullinan Pearl Corp | HLBV
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Losses attributed to noncontrolling interests											$ 300,000	$ 1,700,000
Cullinan Pearl Corp | Subscription Agreement between Company and Pearl | Common Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Shares price per share						$ 0.44
Aggregate purchase price						$ 1,200,000
Purchase of shares						2,730,227
Cullinan Pearl Corp | Series A Preferred Stock
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Gross proceeds							$ 9,000,000.0
Shares sold/issued							9,000,000
Cullinan Pearl Corp | Series A Preferred Stock | Taiho Ventures, LLC
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Gross proceeds										$ 14,000,000.0
Shares sold/issued										14,000,000
Shares price per share										$ 1.00
Cullinan Pearl Corp | Series A Preferred Stock | Taiho License Agreement
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Shares sold/issued							1,206,000			1,860,000
Additional consideration received							$ 0
Aggregate purchase price										$ 0
Cullinan Pearl Corp | Series A Preferred Stock | Maximum | Taiho Ventures, LLC
Common Stock And Noncontrolling Interest In Subsidiaries [Line Items]
Shares sold/issued										23,000,000