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Capital management (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Capital management |  |
Common shares | $ 217,393 | $ 205,825
Deficit | (217,931) | (189,362)
Long-term debt | 7,104 | 7,174
Capital structure | $ 6,566 | $ 23,637

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- References No definition available. + Details
Name: | prof_CapitalManagementAbstract
Namespace Prefix: | prof_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of total capital as defined in the regulations. + References No definition available. + Details
Name: | prof_CapitalStructure
Namespace Prefix: | prof_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of issued capital in the capital management. + References No definition available. + Details
Name: | prof_CommonSharesCapitalManagement
Namespace Prefix: | prof_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of deficit in the capital management. + References No definition available. + Details
Name: | prof_DeficitCapitalManagement
Namespace Prefix: | prof_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of long-term debt in the capital management. + References No definition available. + Details
Name: | prof_LongTermDebtCapitalManagement
Namespace Prefix: | prof_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant