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Organization and Description of Business - Credit Risk (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue | Revenue concentration risk
Concentrations of Credit Risk and Other Risks and Uncertainties
Concentrations of credit risk (as a percent)	36.00%	45.00%
Revenue | Revenue concentration risk | Medicare
Concentrations of Credit Risk and Other Risks and Uncertainties
Concentrations of credit risk (as a percent)	25.00%	21.00%
Revenue | Revenue concentration risk | Johnson & Johnson
Concentrations of Credit Risk and Other Risks and Uncertainties
Concentrations of credit risk (as a percent)		13.00%
Revenue | Revenue concentration risk | UnitedHealthcare
Concentrations of Credit Risk and Other Risks and Uncertainties
Concentrations of credit risk (as a percent)	11.00%	11.00%
Accounts receivable | Gross receivables concentration risk | Medicare
Concentrations of Credit Risk and Other Risks and Uncertainties
Concentrations of credit risk (as a percent)	14.00%		15.00%
Accounts receivable | Gross receivables concentration risk | Johnson & Johnson
Concentrations of Credit Risk and Other Risks and Uncertainties
Concentrations of credit risk (as a percent)			10.00%

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