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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 |  |  |  |  |  |  |  |

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