Accrued Expenses - Schedule of Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accrued expenses:
Accrued payroll	$ 861	$ 1,084
Accrued employee health	309	261
Accrued bonuses	1,130	1,838
Accrued vacation expense	956	384
Accrued deferred interest income		33
Accrued insurance premiums		266
Accrued interest	180	148
Accrued commissions	435	617
Accrued expenses-other	234	624
Accrued warranty	853	988
Accrued income taxes		1,160
Accrued taxes other than income taxes	1,785	242
Accrued product liability and workers compensation claims	232	87
Accrued liability on forward currency exchange contracts		13
Total accrued expenses	$ 6,975	$ 7,745