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Significant Accounting Policies - Additional Information (Detail)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
Significant Accounting Policies [Line Items]          
Allowance for doubtful accounts   $ 500,000 $ 700,000 $ 500,000 $ 100,000
Allowance for doubtful accounts, additions   (100,000) 500,000 361,474  
Write-offs of uncollectible accounts   100,000 244,300 1,000  
Inventory reserves   4,100,000 3,200,000 2,700,000  
Inventory reserves additions   900,000 700,000 900,000  
Provision for inventory obsolescence   $ 931,000 691,000 866,000  
Number of reportable segments | Segment 1        
Standard warranty period   12 months      
Product warranty accrual period   1 year      
Advertising costs   $ 5,700,000 4,800,000 5,900,000  
Guarantees and indemnifications liabilities     0    
Impairment of Intangible Assets, Finite-lived   0 0    
Inventory Valuation Reserve          
Significant Accounting Policies [Line Items]          
Provision for inventory obsolescence   $ 0 $ 300,000 $ 400,000  
Manufacturing equipment          
Significant Accounting Policies [Line Items]          
Estimated useful lives of the assets   5 years      
Prototype Systems          
Significant Accounting Policies [Line Items]          
Estimated useful lives of the assets   2 years      
Computer equipment          
Significant Accounting Policies [Line Items]          
Estimated useful lives of the assets   3 years      
Furniture and fixtures          
Significant Accounting Policies [Line Items]          
Estimated useful lives of the assets   5 years      
Minimum          
Significant Accounting Policies [Line Items]          
Extended warranty period   12 months      
Minimum | Lease and loaner instruments          
Significant Accounting Policies [Line Items]          
Estimated useful lives of the assets   1 year      
Maximum          
Significant Accounting Policies [Line Items]          
Extended warranty period   36 months      
Maximum | Lease and loaner instruments          
Significant Accounting Policies [Line Items]          
Estimated useful lives of the assets   5 years      
Sales Revenue, Net | Customer Concentration Risk | Merck Sharp & Dohme Corp.          
Significant Accounting Policies [Line Items]          
Concentration Risk, Percentage     17.00% 25.00%  
Sales Revenue, Net | Customer Concentration Risk | Lam Research Corporation          
Significant Accounting Policies [Line Items]          
Concentration Risk, Percentage   13.00%      
Sales Revenue, Net | Customer Concentration Risk | Medivation, Inc. and Astellas Pharma, Inc.          
Significant Accounting Policies [Line Items]          
Concentration Risk, Percentage       10.00%  
Accounts Receivable [Member] | Customer Concentration Risk          
Significant Accounting Policies [Line Items]          
Concentration Risk, Percentage   0.00% 0.00%    
Veracyte          
Significant Accounting Policies [Line Items]          
Impairment of long-lived assets   $ 1,100,000