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Business Combinations - Narrative (Details)		4 Months Ended	12 Months Ended
	Sep. 05, 2019 USD ($) subsidiary shares	Dec. 31, 2019 USD ($)	Dec. 31, 2020 business	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) business	Sep. 05, 2019 $ / shares
Business Acquisition [Line Items]
Number of operating subsidiaries acquired | business			0		0
Redwood
Business Acquisition [Line Items]
Number of operating subsidiaries acquired | subsidiary	4
Consideration transferred	$ 283,300,000
Payments to acquire businesses	$ 227,191,000
Consideration transferred, common shares (in shares) | shares	5,086,586
Consideration transferred, common shares, amount	$ 56,109,000
Consideration transferred, common shares, volume weighted average trading price (in dollars per share) | $ / shares						$ 14.74
Acquisition-related costs				$ 8,531,000
Business acquisition, goodwill, expected tax deductible amount	$ 0
Revenue of acquiree since acquisition date		$ 3,364,000
Loss of acquiree since acquisition date		$ 2,613,000
Pro forma revenue				12,266,000	$ 7,630,000
Pro forma net income (loss)				$ 1,112,000	$ 1,533,000

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Number of shares of equity interests issued or issuable to acquire entity.

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