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Schedule II Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Schedule II Valuation and Qualifying Accounts | SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS
|  | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Deductions/ Write-offs (Recoveries) |  | Balance at End of Period
|  | (In thousands)
Year ended December 31, 2017 |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | — |  |  |  |  |  |  |  |  | $ | — |
Year ended December 31, 2016 |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 15 |  |  | $ | 2 |  |  | $ | 17 |  |  | $ | — |
Year ended December 31, 2015 |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 28 |  |  | $ | (6 | ) |  | $ | 7 |  |  | $ | 15 |

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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