Debt instrument exit fee percentage.

No definition available.

Name:	hrmy_DebtInstrumentExitFeePercentage
Namespace Prefix:	hrmy_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Amount of the required periodic payments applied to principal.

+ References

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

Name:	us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=hrmy_SeniorSecuredTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=hrmy_BlackstoneAlternativeCreditAdvisorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=hrmy_RepaymentOfDebtBeginningOnMarch312024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=hrmy_RepaymentOfDebtDueOnMaturityDateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hrmy_CreditAgreementMember
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Debt - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended		9 Months Ended	12 Months Ended
	Jan. 09, 2020	Aug. 31, 2021	Jan. 31, 2020	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt issuance costs paid					$ 9,152	$ 5,804	$ 5,184
Loss on debt extinguishment					26,146	$ 22,639
Senior Secured Term Loan \| Blackstone Alternative Credit Advisors ("Blackstone")
Debt Instrument [Line Items]
Aggregate principal amount		$ 200,000
Debt issuance costs		8,151
Cash proceeds received		$ 191,849
Term of loan		5 years
Fair value of loan					185,389
Senior Secured Term Loan \| Blackstone Alternative Credit Advisors ("Blackstone") \| Repayment of Debt Commencing on December 31, 2021
Debt Instrument [Line Items]
Periodic payment principal		$ 500
Senior Secured Term Loan \| Blackstone Alternative Credit Advisors ("Blackstone") \| Repayment of Debt Beginning on March 31, 2024
Debt Instrument [Line Items]
Periodic payment principal		5,000
Senior Secured Term Loan \| Blackstone Alternative Credit Advisors ("Blackstone") \| Repayment of Debt Due on Maturity Date
Debt Instrument [Line Items]
Periodic payment principal		$ 145,500
Senior Secured Term Loan \| Blackstone Alternative Credit Advisors ("Blackstone") \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		6.50%
Senior Secured Term Loan \| Blackstone Alternative Credit Advisors ("Blackstone") \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Senior Secured Delayed Draw Term Loan \| Blackstone Alternative Credit Advisors ("Blackstone")
Debt Instrument [Line Items]
Aggregate principal amount		$ 100,000
Debt issuance costs		$ 1,000
Credit Agreement \| OrbiMed Royalty & Credit Opportunities, LP.
Debt Instrument [Line Items]
Aggregate principal amount			$ 200,000
Basis spread on variable rate			11.00%
Term of loan	6 years
Fixed interest rate			2.00%
Debt instrument exit fee percentage			7.00%
Extinguishment of loan, amount			$ 222,666
Loss on debt extinguishment					$ 26,146
Multi-draw Loan Agreement \| CRG Servicing LLC
Debt Instrument [Line Items]
Aggregate principal amount			200,000
Extinguishment of loan, amount			$ 120,893
Loss on debt extinguishment				$ 22,639