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Summary of Significant Accounting Policies - Additional Information (Detail)
6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Customer
Segment
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Customer
Summary Of Significant Accounting Policies [Line Items]      
Net cash used in operating activities $ (26,118,000) $ (27,721,000)  
Description of payment of customer invoice contract The Company invoices its customers based upon the terms in the contracts, which generally requires payment 30 to 60 days from the date of invoice.    
Product revenue recognized, that were included in deferred product revenue $ 400,000    
Application of an optional exemption not to disclose the value of unsatisfied performance obligations true    
Number of major customers representing outstanding accounts receivable | Customer 3   3
Number of reportable segments | Segment 1    
Period of warranty 1 year    
Warranty claim liability $ 0   $ 0
Trade Accounts Receivable | Customer Concentration Risk      
Summary Of Significant Accounting Policies [Line Items]      
Concentration risk, percentage 56.00%   51.00%
Other Assets      
Summary Of Significant Accounting Policies [Line Items]      
Cash surrender value of associated life insurance policies $ 900,000   $ 200,000
Other Long-term Liabilities      
Summary Of Significant Accounting Policies [Line Items]      
Liability for deferred compensation $ 1,000,000.0   200,000
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Payment of customer invoice contract period 30 days    
Shelf lives of inventory 18 months    
Estimated useful life of property and equipment 3 years    
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Payment of customer invoice contract period 60 days    
Percentage of deferred compensation from base salary 80.00%    
Percentage of deferred compensation from variable compensation 100.00%    
Shelf lives of inventory 24 months    
Inventory valuation reserves $ 100,000   100,000
Estimated useful life of property and equipment 5 years    
Product      
Summary Of Significant Accounting Policies [Line Items]      
Contract asset $ 0   $ 0
Immaterial Correction of an Error      
Summary Of Significant Accounting Policies [Line Items]      
Net cash used in operating activities   $ 100,000