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SCHEDULE II - VALUATION ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounts receivable, allowance for doubtful accounts |  |  |
Valuation accounts |  |  |
Balance at Beginning of Period | $ 787 | $ 912 | $ 215
Additions Charged (Credited) to Expense | 162 | (125) | 697
Balance at End of Period | 949 | 787 | 912
Deferred tax valuation allowance |  |  |
Valuation accounts |  |  |
Balance at Beginning of Period | 1,280 | 1,280 | 898
Additions Charged (Credited) to Expense | (474) |  | 382
Balance at End of Period | $ 806 | $ 1,280 | $ 1,280

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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