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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounts Receivable - Allowance for Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | $ 303 | $ 357 | $ 525
Additions- Charges to (Recovery of) Costs and Expenses | 124 | (54) | 80
Deductions- Write- offs/Costs Incurred | 76 | 0 | 248
Balance at End of Year | 351 | 303 | 357
Supplies-Reserve for Slow-Moving Items [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 15 | 15 | 928
Additions- Charges to (Recovery of) Costs and Expenses | 0 | 0 | 0
Deductions- Write- offs/Costs Incurred | 0 | 0 | 913
Balance at End of Year | 15 | 15 | 15
Notes Receivable - Allowance for Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year |  | 0 | 970
Additions- Charges to (Recovery of) Costs and Expenses |  |  | 0
Deductions- Write- offs/Costs Incurred |  |  | 970
Balance at End of Year |  |  | 0
Deferred Tax Assets - Valuation Allowance [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 26,920 | 13,128 | 1,242
Additions- Charges to (Recovery of) Costs and Expenses | 21,042 | 13,792 | 11,886
Deductions- Write- offs/Costs Incurred | 2,336 | 0 | 0
Balance at End of Year | $ 45,626 | $ 26,920 | $ 13,128

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 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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