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Schedule II - Valuation and Qualifying Accounts Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Allowance for doubtful accounts: |  |
The roll forward of valuation accounts were as follows: |  |
Balance at beginning of period | $ 549 | $ 476
Charged to costs and expenses | 623 | 695
Deductions | (579) | (622)
Balance at end of period | 593 | 549
Valuation allowance for deferred tax assets: |  |
The roll forward of valuation accounts were as follows: |  |
Balance at beginning of period | 2,569 | 2,556
Charged to costs and expenses | 0 | 13
Deductions | (1,334) | 0
Balance at end of period | $ 1,235 | $ 2,569

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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