Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.19.3.a.u2
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Schedule Of Significant Accounting Policies [Line Items]        
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 $ 211,994,000 $ 149,476,000 $ 138,295,000  
Impairment of long-lived assets held-for-use 0 0 0  
Operating lease right-of-use assets 26,492,000     $ 9,700,000
Operating lease, liability $ 27,415,000     $ 10,100,000
Software and Software Development Costs | Minimum        
Schedule Of Significant Accounting Policies [Line Items]        
Estimated Useful Lives in Years 2 years      
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 $ 14,200,000 $ 9,800,000 $ 10,800,000