Selected Quarterly Financial Data - Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ 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]
Net sales	$ 132,326	$ 236,699	$ 105,781	$ 93,004	$ 136,628	$ 262,413	$ 119,565	$ 94,505	$ 567,810	$ 613,111	$ 706,603
Gross profit	40,486	64,330	27,941	22,959	30,160	61,781	33,719	30,021	155,716	155,681	223,021
Income (Loss) from Operations	(4,418)	20,043	(12,140)	(35,658)	(26,580)	(7,746)	(14,108)	(15,724)	(32,173)	(64,158)	17,106
Income (loss) before provision (benefit) for income taxes	(2,100)	17,652	(16,497)	(38,529)	(29,771)	(16,651)	(16,371)	(18,629)	(39,474)	(81,422)	5,376
Net income (loss)	$ (3,343)	$ 15,699	$ (18,588)	$ (36,193)	$ (30,487)	$ (17,569)	$ (16,687)	$ (18,285)	$ (42,368)	$ (83,085)	$ 1,243
Basic earnings (loss) per share (in dollars per share)	$ (0.14)	$ 0.68	$ (0.80)	$ (1.57)	$ (1.33)	$ (0.77)	$ (0.77)	$ (1.01)	$ (1.83)	$ (3.89)	$ 0.08
Weighted average shares outstanding (in shares)	23,106	23,106	23,106	23,100	22,799	22,772	21,616	18,104	23,104	21,341	16,542
Diluted earnings (loss) per share (in dollars per share)	$ (0.14)	$ 0.38	$ (0.80)	$ (1.57)	$ (1.33)	$ (0.77)	$ (0.77)	$ (1.01)	$ (1.83)	$ (3.89)	$ 0.07
Diluted weighted number of shares (in shares)	23,106	45,686	23,106	23,100	22,799	22,772	21,616	18,104	23,104	21,341	16,665