Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Detail)

v3.20.4
Summary of Significant Accounting Policies (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2021
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2020
May 04, 2020
May 04, 2020
Dec. 31, 2017
Schedule Of Significant Accounting Policies [Line Items]                    
Grant income recognized, COVID-19 $ 7,900,000 $ 0                
Accrued deferred social security taxes, COVID-19   0     $ 5,900,000          
Amount of ERTC recognized, COVID-19 1,900,000 0 $ 0              
Impairment of indefinite lived intangible assets 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 payers and within 60 to 90 days of billing for client payers.                  
Cost of revenue $ 258,555,000 211,994,000 149,476,000              
Restricted cash   0 0   21,919,000          
Convertible senior notes, net   0     168,120,000          
Deferred income tax liabilities, net   15,566,000     5,415,000          
Accumulated deficit   507,408,000 320,443,000   694,294,000         $ 171,962,000
Adjustment for impact of accounting standard                    
Schedule Of Significant Accounting Policies [Line Items]                    
Accumulated deficit                   35,000
Adjustment for impact of accounting standard | Subsequent Event                    
Schedule Of Significant Accounting Policies [Line Items]                    
Convertible senior notes, net       $ 27,000,000            
Deferred income tax liabilities, net       7,000,000            
Additional paid-in capital       23,000,000            
Accumulated Deficit                    
Schedule Of Significant Accounting Policies [Line Items]                    
Accumulated deficit   (11,357,000) (19,363,000)   $ (7,185,000)         (23,079,000)
Accumulated Deficit | Adjustment for impact of accounting standard                    
Schedule Of Significant Accounting Policies [Line Items]                    
Accumulated deficit                   $ 1,130,000
Accumulated Deficit | Adjustment for impact of accounting standard | Subsequent Event                    
Schedule Of Significant Accounting Policies [Line Items]                    
Accumulated deficit       $ 3,000,000            
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% 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 15 years                  
Lease renewal term 5 years                  
Software and Software Development Costs | Minimum                    
Schedule Of Significant Accounting Policies [Line Items]                    
Estimated Useful Lives in Years 1 year                  
Software and Software Development Costs | Maximum                    
Schedule Of Significant Accounting Policies [Line Items]                    
Estimated Useful Lives in Years 10 years                  
Shipping costs                    
Schedule Of Significant Accounting Policies [Line Items]                    
Cost of revenue $ 13,800,000 $ 14,200,000 $ 9,800,000