Revenue Recognition - Activity of Product Revenue Reserves (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Product revenue reserves, beginning balance	$ 11,121
Provision related to sales made in current period	5,158
Payments and customer credits issued	(4,316)
Product revenue reserves, ending balance	11,963
Return
Disaggregation of Revenue [Line Items]
Product revenue reserves, beginning balance	7,561
Provision related to sales made in current period	2,720
Payments and customer credits issued	(1,121)
Product revenue reserves, ending balance	9,160
Chargebacks
Disaggregation of Revenue [Line Items]
Product revenue reserves, beginning balance	899
Provision related to sales made in current period	1,338
Payments and customer credits issued	(1,483)
Product revenue reserves, ending balance	754
Other
Disaggregation of Revenue [Line Items]
Product revenue reserves, beginning balance	2,661
Provision related to sales made in current period	1,100
Payments and customer credits issued	(1,712)
Product revenue reserves, ending balance	$ 2,049