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Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 43,037	$ 39,329	$ 29,787	$ 25,059	$ 29,451	$ 10,927	$ 8,494	$ 10,359	$ 137,212	$ 59,231	$ 47,698
Cost of goods sold	32,938	26,297	21,407	19,662	8,769	5,931	6,532	5,337	100,304	26,569	21,003
Operating expenses	5,533	4,261	4,570	3,839	5,407	2,462	2,214	2,188	18,203	12,271	10,112
Net income (loss)	$ 10,886	$ 7,047	$ 2,624	$ 969	$ 12,441	$ (96)	$ (2,348)	$ 382	$ 21,526	$ 10,379	$ 4,990
Earnings (loss) per share, basic	$ 0.27	$ 0.17	$ 0.07	$ 0.02	$ 0.40		$ (0.11)	$ 0.02	$ 0.54	$ 0.43	$ 0.23
Earnings (loss) per share, diluted	$ 0.27	$ 0.17	$ 0.06	$ 0.02	$ 0.40		$ (0.11)	$ 0.01	$ 0.53	$ 0.42	$ 0.19
Weighted average common shares outstanding	40,393	40,384	40,347	39,697	30,952	22,189	22,145	22,135	40,208	24,322	22,114
Diluted	40,435	40,416	40,453	39,874	31,210	22,189	22,145	26,410	40,304	24,579	26,400

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

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