Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021	Dec. 31, 2021 ft²	Dec. 31, 2021 Rate	Jan. 11, 2021 Rate	Jan. 01, 2021 USD ($)	May 04, 2020 Rate	Dec. 31, 2018 USD ($)
Schedule Of Significant Accounting Policies [Line Items]
Number of reportable segments | segment	2
Number of operating segments | segment	2
Percentage of consolidated assets, net revenues and net income reported by reportable operating segment	100.00%	100.00%	100.00%
Other than temporary impairment losses	$ 0	$ 0	$ 0
Square feet owned | ft²						43,560
Assets held for sale		0		$ 10,050,000
Impairment of indefinite lived intangible assets	0	0	0
Impairment of long-lived assets held-for-use	$ 0	0	0
Performance obligation, description of timing	Collection of consideration the Company expects to receive typically occurs within 30 to 60 days of billing for commercial insurance, Medicare and other governmental and self-pay patients and within 60 to 90 days of billing for client payers.
Cost of revenue	$ 297,269,000	258,555,000	211,994,000
Convertible senior notes, net		168,120,000		532,483,000
Deferred income tax liabilities, net		5,415,000		55,475,000
Deferred tax assets, valuation allowance		2,631,000		33,014,000
Accumulated deficit		694,294,000	507,408,000	1,108,277,000							$ 320,443,000
Cumulative Effect, Period of Adoption, Adjustment
Schedule Of Significant Accounting Policies [Line Items]
Convertible senior notes, net									$ 27,200,000
Deferred income tax liabilities, net									(6,600,000)
Deferred tax assets, valuation allowance									2,000,000
Accumulated deficit		(22,576,000)
Accumulated Deficit
Schedule Of Significant Accounting Policies [Line Items]
Accumulated deficit		(7,185,000)	(11,357,000)	(14,837,000)							(19,363,000)
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment
Schedule Of Significant Accounting Policies [Line Items]
Accumulated deficit		695,000							$ 2,700,000
Additional Paid-in Capital
Schedule Of Significant Accounting Policies [Line Items]
Accumulated deficit		701,357,000	520,278,000	$ 1,123,628,000							$ 340,291,000
Additional Paid-in Capital | Cumulative Effect, Period of Adoption, Adjustment
Schedule Of Significant Accounting Policies [Line Items]
Accumulated deficit		(23,271,000)
0.25% Convertible Senior Notes | Convertible Debt
Schedule Of Significant Accounting Policies [Line Items]
Stated interest rate (as a percent)					0.25%		0.25%	0.25%
1.25% Convertible Senior Notes | Convertible Debt
Schedule Of Significant Accounting Policies [Line Items]
Stated interest rate (as a percent)					1.25%		1.25%			1.25%
Minimum
Schedule Of Significant Accounting Policies [Line Items]
Operating lease, term	1 year
Lease renewal term	1 year
Maximum
Schedule Of Significant Accounting Policies [Line Items]
Operating lease, term	20 years
Lease renewal term	5 years
Shipping costs
Schedule Of Significant Accounting Policies [Line Items]
Cost of revenue	$ 16,500,000	$ 13,800,000	$ 14,200,000