Significant Accounting Policies - Summary of Percentage of Total Product Revenues (Details) - Revenue from Contract with Customer Benchmark - Customer Concentration Risk	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Total Customers
Disaggregation Of Revenue [Line Items]
Percentage of product revenues	100.00%	100.00%	100.00%	100.00%
Affiliates of McKesson Corporation
Disaggregation Of Revenue [Line Items]
Percentage of product revenues	38.00%	45.00%	39.00%	43.00%
Affiliates of AmerisourceBergen Corporation
Disaggregation Of Revenue [Line Items]
Percentage of product revenues	32.00%	22.00%	30.00%	23.00%
OncoMed Specialty, LLC (Onco360)
Disaggregation Of Revenue [Line Items]
Percentage of product revenues	21.00%	21.00%	22.00%	23.00%
Affiliates of Cardinal Health Specialty
Disaggregation Of Revenue [Line Items]
Percentage of product revenues	9.00%	12.00%	9.00%	11.00%