Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Mar. 20, 2020	Jun. 28, 2019
Entity Registrant Name	DiamondPeak Holdings Corp.
Entity Central Index Key	0001759546
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Type	10-K
Document Period End Date	Dec. 31, 2019
Document Fiscal Period Focus	FY
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Document Fiscal Year Focus	2019
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Small Business	true
Entity Shell Company	true
Entity Public Float			$ 272,160,000
Entity File Number	001-38821
Entity Incorporation State Country Code	DE
Class A Common Stock
Entity Common Stock, Shares Outstanding		28,000,000
Class B Common Stock
Entity Common Stock, Shares Outstanding		7,000,000