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Schedule II Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II Valuation and Qualifying Accounts
SCHEDULE II
VALUATION AND QUALIFYING ACCOUNTS
Balance at
Beginning of Period (1)
Charged (Credited) to
Costs and Expenses (2)
Amounts
Written Off (3)
Other Adjustments (4)
Balance at
End of Period (1)
(In thousands)
Year ended December 31, 2019
Accounts receivable and unbilled receivables$2,582 $2,488 $(1,986)$143 $3,227 
Long-term unbilled receivables— — — — — 
Net investment in sales-type leases214 11 — — 225 
Total allowances deducted from assets$2,796 $2,499 $(1,986)$143 $3,452 
Year ended December 31, 2020
Accounts receivable and unbilled receivables$3,227 $1,095 $(535)$499 $4,286 
Long-term unbilled receivables— — — 30 30 
Net investment in sales-type leases225 40 — — 265 
Total allowances deducted from assets$3,452 $1,135 $(535)$529 $4,581 
Year ended December 31, 2021
Accounts receivable and unbilled receivables$4,286 $2,130 $(2,079)$935 $5,272 
Long-term unbilled receivables30 (4)— 26 
Net investment in sales-type leases265 (37)— — 228 
Total allowances deducted from assets$4,581 $2,089 $(2,079)$935 $5,526 
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(1)Allowance for credit losses.
(2)Represents amounts charged and credited for provisions for credit losses.
(3)Represents amounts written off from the allowance and receivable.
(4)Represents other adjustments, such as foreign currency translation, adoption of new accounting guidance, and purchase price accounting adjustments in connection with acquisitions.