Product Revenue Reserves and Allowances (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Summary of Activity of Product Revenue Allowance and Reserves
Bad debt write-offs	$ 0	$ 0
Trade receivables, credit losses	0	0
Product Revenue Allowance and Reserves
Summary of Activity of Product Revenue Allowance and Reserves
Beginning balance	24,602,000	11,229,000
Provision related to sales in the current year	75,273,000	66,327,000
Adjustments related to prior period sales	(1,677,000)	670,000
Credits and payments made	(71,621,000)	(54,524,000)
Ending balance	26,577,000	23,702,000
Chargebacks, Discounts, and Fees
Summary of Activity of Product Revenue Allowance and Reserves
Beginning balance	5,739,000	3,198,000
Provision related to sales in the current year	16,123,000	21,203,000
Adjustments related to prior period sales	(107,000)	(27,000)
Credits and payments made	(20,011,000)	(19,759,000)
Ending balance	1,744,000	4,615,000
Government and other rebates
Summary of Activity of Product Revenue Allowance and Reserves
Beginning balance	17,280,000	7,620,000
Provision related to sales in the current year	57,120,000	44,426,000
Adjustments related to prior period sales	(1,570,000)	697,000
Credits and payments made	(50,717,000)	(34,190,000)
Ending balance	22,113,000	18,553,000
Returns
Summary of Activity of Product Revenue Allowance and Reserves
Beginning balance	1,583,000	411,000
Provision related to sales in the current year	2,030,000	698,000
Adjustments related to prior period sales	0	0
Credits and payments made	(893,000)	(575,000)
Ending balance	$ 2,720,000	$ 534,000