Notes payable (Detail) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Line of Credit Facility [Line Items] | ||
| Notes payable | $ 2,100 | $ 14,400 |
| Less: Notes payable - current | (1,796) | (2,360) |
| Notes payable - noncurrent | 270 | 12,066 |
| Value Lighting | ||
| Line of Credit Facility [Line Items] | ||
| Notes payable | $ 2,100 | 2,400 |
| TNT | ||
| Line of Credit Facility [Line Items] | ||
| Notes payable | 2,000 | |
| Energy Source | ||
| Line of Credit Facility [Line Items] | ||
| Notes payable | $ 10,000 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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