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Inventories - Allowance (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Inventory Valuation Reserves [Roll Forward] |  |  |  |
Balance, beginning of period | $ 2,350 | $ 1,407 | $ 1,210 | $ 1,118
Provisions for excess and obsolete inventories | (150) | (263) | 1,003 | 55
Inventories written off | 0 | (30) | (13) | (59)
Balance, end of period | $ 2,200 | $ 1,114 | $ 2,200 | $ 1,114

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