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Inventories - Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Allowance for excess and obsolete inventories: |  |  |
Balance, beginning of period | $ 1,382 | $ 757 | $ 714
Provisions for excess and obsolete inventories | 102 | 625 | 178
Inventories written off | (366) | 0 | (135)
Balance, end of period | $ 1,118 | $ 1,382 | $ 757

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- Definition Inventory that is written off due to being excess or obsolete. + References No definition available. + Details
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