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Current Expected Credit Losses - Additional Information (Detail)		3 Months Ended
	Jan. 01, 2020 USD ($)	Mar. 31, 2020 USD ($) Position	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items]
Outstanding accounts receivable	$ 90,500,000	$ 86,465,000	$ 90,531,000
Allowance for credit loss, accounts receivable	0	0
Allowance for credit losses, accounts receivable		38,000	38,000
Outstanding contract asset	2,800,000	1,354,000	2,812,000
Allowance for credit losses related to contract assets	0	0
Outstanding net investment in sales-type leases	1,600,000	1,342,000	1,562,000	$ 1,342,000
Net investment in sales-type leases, allowance for credit loss	0	0
Secured loan receivable	900,000	900,000
Accrued interest receivable	100,000	100,000
Secured loan receivable, allowance for credit loss	0	0
Available-for-sale debt securities	37,700,000	$ 37,860,000	$ 37,660,000
Number of positions in available-for-sale debt securities, unrealized loss position | Position		60
Available-for-sale, debt securities, allowance for credit loss	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	$ 41,000

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