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Summary of Significant Accounting Policies - Revenue by Major Payers (Details) - Customer Concentration Risk	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Medicare | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percent of total revenue	20.00%	25.00%	21.00%	26.00%
Janssen (SIMPONI) | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percent of total revenue	13.00%		12.00%
Janssen (SIMPONI) | Accounts Receivable
Disaggregation of Revenue [Line Items]
Percent of total revenue			37.00%		19.00%
Blue Shield | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percent of total revenue	12.00%	13.00%	12.00%	13.00%
Blue Shield | Accounts Receivable
Disaggregation of Revenue [Line Items]
Percent of total revenue			10.00%		15.00%
Medicare Advantage | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percent of total revenue	11.00%	12.00%	11.00%	11.00%
United Healthcare | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Percent of total revenue		10.00%		10.00%
United Healthcare | Accounts Receivable
Disaggregation of Revenue [Line Items]
Percent of total revenue					22.00%
Anthem Blue Cross Blue Shield | Accounts Receivable
Disaggregation of Revenue [Line Items]
Percent of total revenue			12.00%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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