Product Revenue Reserves and Allowances (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Summary of Activity of Product Revenue Allowance and Reserves
Bad debt write-offs	$ 0
Trade receivables, credit losses	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	50,465,000	43,821,000
Adjustments related to prior period sales	(2,569,000)	(340,000)
Credits and payments made	(52,874,000)	(35,929,000)
Ending balance	19,624,000	18,781,000
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	12,129,000	13,034,000
Adjustments related to prior period sales	(294,000)	(16,000)
Credits and payments made	(15,390,000)	(11,971,000)
Ending balance	2,184,000	4,245,000
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	34,448,000	30,294,000
Adjustments related to prior period sales	(826,000)	(183,000)
Credits and payments made	(36,805,000)	(23,690,000)
Ending balance	14,097,000	14,041,000
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	3,888,000	493,000
Adjustments related to prior period sales	(1,449,000)	(141,000)
Credits and payments made	(679,000)	(268,000)
Ending balance	$ 3,343,000	$ 495,000