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SUBSEQUENT EVENTS (Details) - Armata shares in Millions, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 26, 2021 USD ($) tranche shares | Jan. 27, 2020 USD ($) | Mar. 31, 2021 USD ($) shares | Dec. 31, 2020 tranche
Subsequent Events |  |  |  |
Number of tranches | tranche |  |  |  | 2
Common stock and warrants |  |  |  |
Subsequent Events |  |  |  |
Amount of securities purchase agreement |  | $ 25.0 |  |
Subsequent events | Common stock and warrants |  |  |  |
Subsequent Events |  |  |  |
Amount of securities purchase agreement | $ 20.0 |  |  |
Number of tranches | tranche | 2 |  |  |
Subsequent events | Common stock and warrants | Tranche one |  |  |  |
Subsequent Events |  |  |  |
Number of shares purchased | shares | 1.9 |  |  |
Aggregate purchase price | $ 6.1 |  |  |
Subsequent events | Common stock and warrants | Tranche two |  |  |  |
Subsequent Events |  |  |  |
Number of shares purchased | shares |  |  | 4.3 |
Aggregate purchase price |  |  | $ 13.9 |

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