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)

v3.8.0.1
Summary of Significant Accounting Policies - Additional Information (Detail)
12 Months Ended
Dec. 31, 2017
USD ($)
Client
$ / shares
Dec. 31, 2016
USD ($)
Client
Dec. 31, 2015
USD ($)
Client
Jan. 01, 2017
USD ($)
Schedule Of Significant Accounting Policies [Line Items]        
Outsourced shipping expenses $ 10,800,000 $ 10,300,000 $ 3,600,000  
Number of clients accounted for more than 5% revenue | Client 0 0 0  
Minimum cost of purchases under Property and equipment $ 1,000      
Impairment loss $ 0 $ 3,500,000 $ 0  
Minimum threshold percentage of voting securities on acquisition for deemed liquidation event 50.00%      
Maximum voting power percentage after consolidation merger or reorganization for deemed liquidation event 50.00%      
Preferred stock conversion trading price | $ / shares $ 8.00      
Convertible preferred stock, terms of conversion conversion (Written Call Option) on the underlying shares if after three years the stock trades at $8.00 for thirty trading days, and (v) conversion (Contingent Forward) on the underlying shares automatically at the ten year anniversary of the issue date.      
Accretion expense recognized period 3 years      
Largest amount of tax benefit Greater than 50%      
Provision for interest or penalties related to uncertain tax positions $ 0 $ 0 $ 0  
Dividend yield (%) 0.00% 0.00% 0.00%  
Adoption of accounting standard, cumulative-effect adjustment       $ 6,400,000
Income (loss) on excess tax benefits and tax deficiencies related to share based compensation $ 0      
Excess tax benefits as cash flows from operating activities $ 0 $ 0 $ 0  
Software and Software Development Costs | Minimum [Member]        
Schedule Of Significant Accounting Policies [Line Items]        
Property and equipment, life 3 years      
Software and Software Development Costs | Maximum [Member]        
Schedule Of Significant Accounting Policies [Line Items]        
Property and equipment, life 5 years      
Net Revenues [Member] | Customer Concentration Risk [Member]        
Schedule Of Significant Accounting Policies [Line Items]        
Percentage of revenue derived from 5.00% 5.00% 5.00%  
Net Revenues [Member] | California [Member] | Customer Concentration Risk [Member] | Clarient, Inc. [Member]        
Schedule Of Significant Accounting Policies [Line Items]        
Percentage of revenue derived from 21.10% 24.00% 20.20%  
Net Revenues [Member] | Florida [Member] | Customer Concentration Risk [Member] | Clarient, Inc. [Member]        
Schedule Of Significant Accounting Policies [Line Items]        
Percentage of revenue derived from 13.90% 15.00% 20.50%  
Interest Rate Swaps [Member]        
Schedule Of Significant Accounting Policies [Line Items]        
Fair value of derivative instrument $ 352,000,000 $ 0