Nature of business and summary of significant accounting policies, Basis of presentation and consolidation (FY) (Details) - $ / shares |
May 06, 2019 |
Sep. 30, 2020 |
Dec. 31, 2019 |
Dec. 19, 2019 |
Dec. 31, 2018 |
|---|---|---|---|---|---|
| Basis of Presentation and Consolidation [Abstract] | |||||
| Number of common shares issued for acquisition (in shares) | 33,130,806 | ||||
| Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | |
| Halo Acquisition [Member] | |||||
| Basis of Presentation and Consolidation [Abstract] | |||||
| Common stock, par value (in dollars per share) | $ 0.001 | ||||
| Acquisitions [Abstract] | |||||
| Outstanding interests acquired | 100.00% |
| X | ||||||||||
- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Face amount or stated value per share of common stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Number of shares of stock issued during the period pursuant to acquisitions. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|