| Cover | Oct. 27, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 27, 2021 |
| Entity File Number | 001-39864 |
| Entity Registrant Name | Mountain Crest Acquisition Corp. II |
| Entity Central Index Key | 0001832415 |
| Entity Tax Identification Number | 85-3472546 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 311 West 43rd Street |
| Entity Address, Address Line Two | 12th Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10036 |
| City Area Code | 646 |
| Local Phone Number | 493-6558 |
| Written Communications | true |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Units |
| Trading Symbol | MCADU |
| Security Exchange Name | NASDAQ |
| Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | MCAD |
| Security Exchange Name | NASDAQ |
| Rights [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Rights |
| Trading Symbol | MCADR |
| Security Exchange Name | NASDAQ |
