Components of Net Tax Effects of Temporary Differences Between Carrying Amounts of Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2012
Deferred tax assets (liabilities):
Provision for doubtful accounts	$ 230	$ 437
Inventory-related expense	274	469
Accrued liabilities	1,385	1,281
Net operating loss carryforward
Other
Total current deferred tax assets	1,889	2,187
Depreciation and amortization	775	613
Net operating loss carryforward	20,337	13,243
Other	(5)	31
Total non-current deferred tax assets	21,107	13,887
Valuation allowance	(22,996)	(16,074)	(14,500)
Total net deferred tax assets