Subsequent events (Details) - Subsequent events		3 Months Ended
Apr. 20, 2020 installment shares	Jun. 30, 2020
Subsequent events
Employees salary reduction (in percentage)		20.00%
Minimum
Subsequent events
Salary waived of officers and directors		25.00%
Employee \| Options
Subsequent events
Granted \| shares	672,728
Vesting period	4 years
Number of quarterly installments of vesting \| installment	12
Employee \| Options \| Vesting upon first anniversary
Subsequent events
Vesting percentage	25.00%
Employee \| Options \| Vesting in equal quarterly installments
Subsequent events
Vesting percentage	75.00%

Represents the percentage of temporary salary reduction accepted by majority of the employees.

No definition available.

Name:	hook_EmployeesVoluntarySalaryReductionPercentage
Namespace Prefix:	hook_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of salary waived of by officers and directors due to COVID 19 crisis.

+ References

No definition available.

+ Details

Name:	hook_SalaryWaivedOfficersAndDirectorsPercentage
Namespace Prefix:	hook_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of quarterly installments of award vesting under the share based compensation arrangement.

+ References

No definition available.

+ Details

Name:	hook_SharebasedCompensationArrangementBySharebasedPaymentAwardVestingNumberOfQuarterlyInstallments
Namespace Prefix:	hook_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of vesting of award under share-based payment arrangement.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_GranteeStatusAxis=us-gaap_ShareBasedPaymentArrangementEmployeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix:
Data Type:	na
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Period Type: