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Current Expected Credit Losses - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Jan. 01, 2020
USD ($)
Sep. 30, 2020
USD ($)
Position
Sep. 30, 2020
USD ($)
Position
Dec. 31, 2019
USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]        
Outstanding accounts receivable $ 90,500,000 $ 100,223,000 $ 100,223,000 $ 90,531,000
Allowance for credit loss, accounts receivable 0 0 0  
Allowance for credit losses, accounts receivable   38,000 38,000 38,000
Outstanding contract asset 2,800,000 1,015,000 1,015,000 2,812,000
Allowance for credit losses related to contract assets 0 0 0  
Outstanding net investment in sales-type leases 1,600,000 956,000 956,000 1,562,000
Net investment in sales-type leases, allowance for credit loss 0 0 0  
Secured loan receivable 900,000 900,000 900,000  
Accrued interest receivable 100,000 100,000 100,000  
Secured loan receivable, allowance for credit loss 0 0 0  
Available-for-sale debt securities 37,700,000 $ 44,873,000 $ 44,873,000 $ 37,660,000
Number of positions in available-for-sale debt securities, unrealized loss position | Position   45 45  
Available-for-sale, debt securities, allowance for credit loss 0 $ 0 $ 0  
Secured Loans Receivable [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loss related to secured loan receivable     0  
Accrued interest receivable $ 24,000 $ 0 $ 0