NET LOSS PER SHARE - Schedule of Anti-dilutive Common Equivalent Shares (Details) - shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total anti-dilutive common equivalent shares	23,260,512	37,608,824
Outstanding Options to Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total anti-dilutive common equivalent shares	11,482,461	1,851,656
Outstanding Legacy Hyperfine Convertible Preferred Stock (Series A through D)
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total anti-dilutive common equivalent shares		35,757,168
Outstanding RSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total anti-dilutive common equivalent shares	1,778,051
Earn-Out Shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Total anti-dilutive common equivalent shares	10,000,000