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Inventories - Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for excess and obsolete inventories: |  |  |
Balance, beginning of period | $ 1,118 | $ 1,382 | $ 757
Provisions for excess and obsolete inventories | 152 | 102 | 625
Inventories written off | (60) | (366) | 0
Balance, end of period | $ 1,210 | $ 1,118 | $ 1,382

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- Definition Charge to expense for inventory that is expected to be excess or obsolete. + References No definition available. + Details
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- Definition Inventory Valuation Reserves [Roll Forward] + References No definition available. + Details
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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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