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Revenue - (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue
Product revenue - gross	$ 41,380	$ 11,478	$ 87,935	$ 20,415
Less: Rebate and sales return	(4,445)	(483)	(30,897)	(1,202)
Product revenue - net	$ 36,935	$ 10,995	$ 57,038	$ 19,213

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue from contract with customers excluding assessed tax, before adjustments for rebates and sales return.

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