Inventories - Summary of Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Inventories
Finished goods	$ 9,595	$ 9,447
Work-in-process	16,276	14,954
Raw materials	25,012	23,363
Less: Inventory reserves	(5,204)	(5,527)
Inventories, net	$ 45,679	$ 42,237

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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