Warrants - Change in warrant derivative liability (Q1) (Details) - USD ($) $ in Thousands |
3 Months Ended | 8 Months Ended | 12 Months Ended | |
|---|---|---|---|---|
Mar. 31, 2021 |
Dec. 31, 2019 |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||||
| Balance, beginning of period | $ 0 | $ 2,220 | ||
| Change in fair value of warrant derivative liability | 0 | $ 90 | (2,220) | $ 90 |
| Balance, end of period | $ 0 | $ 2,220 | $ 0 | $ 2,220 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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