Product Revenue - Schedule of Changes in Contract Assets (Details) $ in Thousands	6 Months Ended
Jun. 30, 2026 USD ($)
Contract assets
Contract receivable, beginning balance	$ 10,577
Additions	67,126
Deductions	(57,591)
Contract receivable, ending balance	20,112
Contract assets, beginning balance	0
Additions	4,104
Deductions	0
Contract assets, ending balance	4,104
Contract assets, beginning balance	10,577
Additions	71,230
Deductions	(57,591)
Contract assets, ending balance	$ 24,216

Change In Contract With Customer, Asset [Roll Forward]

No definition available.

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- Definition

Contract with Customer, Asset, after Allowance for Credit Loss, Proceeds From Collection Of Receivables

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Contract with Customer, Asset, after Allowance for Credit Loss, Revenue Recognized, Current

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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Namespace Prefix:	agio_
Data Type:	xbrli:monetaryItemType
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- References

No definition available.

+ Details

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Namespace Prefix:	agio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Contract with Customer, Receivable, after Allowance for Credit Loss, Proceeds From Collection Of Receivables

+ References

No definition available.

+ Details

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Namespace Prefix:	agio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Contract with Customer, Receivable, after Allowance for Credit Loss, Revenue Recognized, Current

+ References

No definition available.

+ Details

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Namespace Prefix:	agio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

+ Details

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Period Type:	instant