SHAREHOLDERS' EQUITY, Ordinary Shares (Q3) (Details)	7 Months Ended	9 Months Ended
Dec. 31, 2019 Vote $ / shares shares	Sep. 30, 2020 Vote $ / shares shares	Sep. 30, 2019 shares
Stockholders' Equity [Abstract]
Ordinary shares subject to possible redemption (in shares)	23,740,181	23,668,455	23,750,733
Conversion of stock at the time of an initial business combination (in shares)	1	1
Stock conversion percentage threshold	20.00%	20.00%
Class A Ordinary Shares [Member]
Stockholders' Equity [Abstract]
Ordinary shares, shares authorized (in shares)	200,000,000	200,000,000
Ordinary shares, par value (in dollars per share) \| $ / shares	$ 0.0001	$ 0.0001
Votes per share \| Vote	1	1
Ordinary shares, shares issued (in shares)	1,259,819	1,331,545
Ordinary shares, shares outstanding (in shares)	1,259,819	1,331,545
Ordinary shares subject to possible redemption (in shares)	23,740,181	23,668,455
Class B Ordinary Shares [Member]
Stockholders' Equity [Abstract]
Ordinary shares, shares authorized (in shares)	20,000,000	20,000,000
Ordinary shares, par value (in dollars per share) \| $ / shares	$ 0.0001	$ 0.0001
Votes per share \| Vote	1	1
Ordinary shares, shares issued (in shares)	6,250,000	6,250,000
Ordinary shares, shares outstanding (in shares)	6,250,000	6,250,000

Number of votes each holder is entitled to vote per share.

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The stock conversion percentage threshold equal to the sum of the total number of all shares of common stock outstanding upon the completion of the Initial Public Offering plus all shares of Class A common stock and equity-linked securities issued or deemed issued in connection with the initial Business Combination (excluding any shares or equity-linked securities issued, or to be issued, to any seller in the initial Business Combination and any private placement-equivalent warrants issued to the Sponsor or its affiliates upon conversion of loans made to the Company).

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Face amount or stated value per share of common stock.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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-Publisher FASB
-Name Accounting Standards Codification
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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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