Accrued Expenses and Other Current Liabilities (Detail) - Accrued expenses and other current liabilities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Accrued salaries and benefits	$ 1,283	$ 1,347
Accrued warranty	824	665	757	645
Liability for consigned precious metals	697	694
Accrued severance and other charges	277	490
Sales tax payable	214	216
Other	1,041	1,102
Accrued expenses and other current liabilities	$ 4,336	$ 4,514

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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- Definition

Carrying value as of the balance sheet date of liabilities incurred through that date and payable for statutory sales and use taxes, including value added tax. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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