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Schedule of valuation and qualifying accounts | 12 Months Ended
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Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract] |
Schedule of valuation and qualifying accounts | Schedule II - Valuation and Qualifying Accounts – Years ended December 31, 2016, 2015, and 2014 (in thousands)
Col. A |  | Col. B |  | Col. C(1) |  | Col. C(2) |  | Col. D |  | Col. E
|  |  |  | Additions |  |  |  |
|  | Balance at |  | Charged to |  | Charged |  | Deductions |  | Balance
|  | Beginning |  | Costs and |  | to Other |  | Charged to |  | at End
|  | of Period |  | Expenses |  | Accounts |  | Reserves |  | of Period
Allowance for doubtful accounts receivable: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  | $ | 20 |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 20 |
2015 |  | $ | 20 |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 20 |
2014 |  | $ | 20 |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 20 |
Inventory reserves: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
2015 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
2014 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Warranty reserves: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
2015 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
2014 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Deferred tax asset valuation allowance: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
2015 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
2014 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |

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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 -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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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