Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Feb. 16, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-39450
Entity Registrant Name	HARMONY BIOSCIENCES HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-2279923
Entity Address, Postal Zip Code	19462
Entity Address, Address Line One	630 W.
Entity Address, Address Line Two	Germantown Pike
Entity Address, Address Line Three	Suite 215
Entity Address, City or Town	Plymouth Meeting
Entity Address, State or Province	PA
City Area Code	484
Local Phone Number	539-9800
Title of 12(b) Security	Common Stock, par value $0.00001 value per share
Trading Symbol	HRMY
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 1,174.5
Entity Common Stock, Shares Outstanding		56,769,081
Entity Central Index Key	0001802665
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Amendment Flag	true
Amendment Description	Harmony Biosciences Holdings, Inc. (the “Company”) is filing this Amendment No. 1 on Form 10-K/A (this “Amendment”) to its Annual Report on Form 10-K for the fiscal year ended December 31, 2023, which was originally filed with the Securities and Exchange Commission (the “SEC”) on February 22, 2024 (the “Original Filing”). This Amendment is being filed to revise Part II “Item 9B. Other Information” by adding Rule 10b5-1 trading arrangements entered into or modified by certain of our officers during the quarter ended December 31, 2023.
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Philadelphia, Pennsylvania