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v3.20.1

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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