Revenue Recognition - Schedule of Product Sales Allowances and Accruals (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Provision related to current period sales	$ 0	$ 100	$ 600	$ 300
Total revenues	385,813	$ 428,064	1,373,387	$ 940,739
Rayaldee
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12,611		11,737
Provision related to current period sales	6,880		27,809
Credits or payments made	(10,754)		(30,809)
Ending balance	8,737		8,737
Total revenues	$ 15,332		$ 47,099
Provision for Rayaldee sales allowances and accruals as a percentage of gross Rayaldee sales	45.00%		59.00%
Chargebacks, discounts, rebates and fees | Rayaldee
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,701		$ 2,332
Provision related to current period sales	3,315		10,854
Credits or payments made	(3,616)		(11,786)
Ending balance	1,400		1,400
Governmental | Rayaldee
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	7,586		5,812
Provision related to current period sales	3,258		16,013
Credits or payments made	(6,733)		(17,714)
Ending balance	4,111		4,111
Returns | Rayaldee
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,324		3,593
Provision related to current period sales	307		942
Credits or payments made	(405)		(1,309)
Ending balance	$ 3,226		$ 3,226