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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 52,248	$ 63,146	$ 54,448	$ 42,628	$ 43,037	$ 39,329	$ 29,787	$ 25,059	$ 212,470	$ 137,212	$ 59,231
Cost of goods sold	34,217	40,595	34,678	35,413	32,938	26,297	21,407	19,662	144,903	100,304	26,569
Operating expenses	23,820	5,145	6,861	5,862	5,533	4,261	4,570	3,839	41,688	18,203	12,271
Net income	$ (4,433)	$ 12,125	$ 10,021	$ 975	$ 10,886	$ 7,047	$ 2,624	$ 969	$ 18,688	$ 21,526	$ 10,379
Basic (in dollars per share)	$ (0.11)	$ 0.30	$ 0.25	$ 0.02	$ 0.27	$ 0.17	$ 0.07	$ 0.02	$ 0.46	$ 0.54	$ 0.43
Diluted (in dollars per share)	$ (0.11)	$ 0.30	$ 0.25	$ 0.02	$ 0.27	$ 0.17	$ 0.06	$ 0.02	$ 0.46	$ 0.53	$ 0.42

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Total costs related to goods produced and sold during the reporting period.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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