Select Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016		Sep. 30, 2016	Jun. 30, 2016		Mar. 31, 2016	Dec. 31, 2015		Sep. 30, 2015	Jun. 30, 2015		Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 69,257		$ 65,222	$ 62,454		$ 64,711	$ 70,314		$ 78,260	$ 77,959		$ 81,600	$ 261,644	$ 308,133	$ 390,011
Gross profit	15,076		12,045	12,430		13,399	15,120		16,131	16,935		17,724	52,950	65,910	85,938
Operating income (loss)	(1,630)	[1]	(1,804)	(3,062)	[2]	(39)	743	[3]	1,783	(234)	[4]	3,726	(6,535)	6,018	25,423
Net income (loss)	$ (1,826)	[1]	$ (1,439)	$ (2,557)	[2]	$ (184)	$ (199)	[3]	$ 676	$ (619)	[4]	$ 2,186	$ (6,006)	$ 2,044	$ 14,972
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.11)	[1]	$ (0.09)	$ (0.16)	[2]	$ (0.01)	$ (0.01)	[3]	$ 0.04	$ (0.04)	[4]	$ 0.13	$ (0.37)	$ 0.12	$ 0.85
Diluted (in dollars per share)	$ (0.11)	[1]	$ (0.09)	$ (0.16)	[2]	$ (0.01)	$ (0.01)	[3]	$ 0.04	$ (0.04)	[4]	$ 0.13	$ (0.37)	$ 0.12	$ 0.85
Non-cash impairment charge				$ 2,384			$ 423			$ 2,994			$ 2,384	$ 3,417

[1] During the fourth quarter of 2016, the Company recorded a charge of $483 of additional cost of sales expense that related to the first three quarters of 2016 and was immaterial to each quarter.

[2] During the second quarter of 2016, the Company recorded a non-cash impairment charge of $2,384. See Note 4 for additional information.

[3] During the fourth quarter of 2015, the Company recorded a non-cash impairment charge of $423. See Note 4 for additional information.

[4] During the second quarter of 2015, the Company recorded a non-cash impairment charge of $2,994. See Note 4 for additional information.