XML 94 R56.htm IDEA: XBRL DOCUMENT
v3.23.4

Restructuring Activities - Schedule Of Restructuring Liability Of Company (Details) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2023 USD ($)
Restructuring and Related Activities [Abstract] |
Accrued employee termination benefits beginning balance | $ 0
Employee termination benefits charges incurred during the period | 7,883
Amounts paid or otherwise settled during the period | (4,900)
Accrued employee termination benefits as of September 30, 2023 | $ 2,983

X
- Definition Accrued Employee Termination Benefits Ending Balance + References No definition available. + Details
Name: | grph_AccruedEmployeeTerminationBenefitsEndingBalance
Namespace Prefix: | grph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Severance Costs Incurred + References No definition available. + Details
Name: | grph_SeveranceCostsIncurred
Namespace Prefix: | grph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_AccruedEmployeeBenefitsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RestructuringAndRelatedActivitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
Name: | us-gaap_SeveranceCosts1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration