401(k) Savings Plan - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan description		Effective January 1, 2018, the Company adopted the 2018 401(k) Plan, a defined contribution plan under Section 401(k) of the Internal Revenue Code, whereby the Company provides matching contributions of 100% of each employee's contribution up to a maximum matching contribution of 3% of the employee's eligible compensation and at a rate of 50% of each employee's contribution in excess of 3% up to a maximum of 5% of the employee's eligible compensation.
Matching contributions to the plan by employer	$ 0.9		$ 0.4	$ 0.1
Up to Three Percent of Compensation
Defined Contribution Plan Disclosure [Line Items]
Percentage of matching contribution to plan		100.00%
Three to Five Percent of Compensation
Defined Contribution Plan Disclosure [Line Items]
Percentage of matching contribution to plan		50.00%
Clinical Reference Laboratory, Inc.
Defined Contribution Plan Disclosure [Line Items]
Percentage of salary for matching contribution per employee				6.00%
Maximum | First Tier of Matching
Defined Contribution Plan Disclosure [Line Items]
Employee earnings subject to employer match		3.00%
Maximum | Second Tier of Matching
Defined Contribution Plan Disclosure [Line Items]
Percentage of salary for matching contribution per employee on time-based vesting		5.00%
Maximum | Clinical Reference Laboratory, Inc.
Defined Contribution Plan Disclosure [Line Items]
Percentage of matching contribution to plan				50.00%
Minimum | Second Tier of Matching
Defined Contribution Plan Disclosure [Line Items]
Percentage of salary for matching contribution per employee on time-based vesting		3.00%