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Stockholders' Deficit, Option Plans, and Employee Benefit Plan (FY) (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2017 shares | Jun. 30, 2020 shares | Jun. 30, 2020 shares | Dec. 31, 2019 USD ($) Vote shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares
Common Stock [Abstract] |  |  |  |  |  |
Number of votes per share | Vote |  |  |  | 1 |  |
Restricted Stock Grants [Rollforward] |  |  |  |  |  |
Outstanding at beginning of year (in shares) |  |  | 4,905,000 | 4,920,000 | 4,975,000 | 0
Granted | 5,005,000 | 100,000 |  | 0 | 0 | 5,005,000
Forfeited |  |  |  | (15,000) | (55,000) | (30,000)
Outstanding at end of year (in shares) |  |  |  | 4,905,000 | 4,920,000 | 4,975,000
Restricted stock remained subject to vesting (in shares) |  |  |  | 1,198,750 |  |
Telos Shared Savings Plan [Abstract] |  |  |  |  |  |
Shares held in defined contribution employee savings plan (in shares) |  |  |  | 3,658,536 |  |
Maximum contribution percentage |  |  |  | 2.00% |  |
Annual vesting percentage |  |  |  | 20.00% |  |
Vesting period of stock options |  |  |  | 5 years |  |
Contributions to the Plan | $ |  |  |  | $ 861,000 | $ 721,000 | $ 617,000
Telos ID [Member] |  |  |  |  |  |
Telos Shared Savings Plan [Abstract] |  |  |  |  |  |
Maximum contribution percentage |  |  |  | 2.00% |  |
Contributions to the Plan | $ |  |  |  | $ 151,000 | $ 125,000 | $ 105,000
Unvested Restricted Stock [Member] |  |  |  |  |  |
Restricted Stock Grants [Rollforward] |  |  |  |  |  |
Restricted stock remained subject to vesting (in shares) |  | 75,000 | 75,000 |  |  |
Restricted stock vested on date of grant |  |  | 25.00% | 25.00% |  |
Restricted stock vest on anniversary of the date of grant |  |  | 25.00% | 25.00% |  |

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