Product Revenue Reserves and Allowances (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 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	28,812,000	19,527,000
Adjustments related to prior period sales	(594,000)	(205,000)
Credits and payments made	(25,918,000)	(13,288,000)
Ending balance	26,902,000	17,263,000
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	8,201,000	5,589,000
Adjustments related to prior period sales	(63,000)	(19,000)
Credits and payments made	(9,226,000)	(4,738,000)
Ending balance	4,651,000	4,030,000
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	19,080,000	13,903,000
Adjustments related to prior period sales	(531,000)	(45,000)
Credits and payments made	(16,488,000)	(8,464,000)
Ending balance	19,341,000	13,014,000
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	1,531,000	35,000
Adjustments related to prior period sales	0	(141,000)
Credits and payments made	(204,000)	(86,000)
Ending balance	$ 2,910,000	$ 219,000