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Equity method investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jul. 24, 2020
Equity Method Investments and Joint Ventures [Abstract]
Oncacare Limited	$ 3,062		$ 3,062		$ 4,534	$ 4,900
Equity method investment, ownership percentage	49.00%		49.00%
Equity method investment, majority ownership percentage	51.00%		51.00%
Equity method investment, period majority voting share capital can be sold to the company			2 years 6 months
Loss from equity method investments	$ 688	$ 83	$ 1,471	$ 83

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- Definition

Equity Method Investment, Majority Ownership Percentage

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- Definition

Equity Method Investment, Period Majority Voting Share Capital Can Be Sold To The Company

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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