| Cover | Feb. 10, 2022 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 16, 2022 |
| Entity Registrant Name | Rockley Photonics Holdings Limited |
| Entity Incorporation, State or Country Code | E9 |
| Entity File Number | 001-40735 |
| Entity Address, Address Line One | 3rd Floor |
| Entity Address, Address Line Two | 1 Ashley Road |
| Entity Address, City or Town | Altrincham |
| Entity Address, Country | GB |
| Entity Address, Postal Zip Code | WA14 2DT |
| City Area Code | +44 |
| Local Phone Number | (0) 1865 292017 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001852117 |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Tax Identification Number | 98-1644526 |
| Common Stock | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Ordinary shares, $0.000004026575398 par value per share |
| Trading Symbol | RKLY |
| Security Exchange Name | NYSE |
| Warrant | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for one ordinary share at an exercise price of $11.50 per share |
| Trading Symbol | RKLY.WS |
| Security Exchange Name | NYSE |
