| Cover | Oct. 13, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 13, 2020 |
| Entity File Number | 001-38601 |
| Entity Registrant Name | LIQUIDIA TECHNOLOGIES, INC. |
| Entity Central Index Key | 0001330436 |
| Entity Tax Identification Number | 20-1926605 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 419 Davis Drive |
| Entity Address, Address Line Two | Suite 100 |
| Entity Address, City or Town | Morrisville |
| Entity Address, State or Province | NC |
| Entity Address, Postal Zip Code | 27560 |
| City Area Code | 919 |
| Local Phone Number | 328-4400 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock |
| Trading Symbol | LQDA |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | true |
