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Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Significant Accounting Policies [Line Items]
Deferred revenue	$ 2,100,000		$ 1,600,000
Sales commissions	142,000	262,000
Percentage of cash discount offered to customers	2.00%
Tax Credit Carryforward, Deferred Tax Asset	60,000
Cash discount payment period	10 days
Deferred tax assets, valuation allowance	31,500,000
Customer Payment [Member]
Significant Accounting Policies [Line Items]
Deferred revenue	$ 651,000

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

The cumulative amount of future tax effects arising from the unused tax credit carryforward that cannot be utilized on the tax return during a year that may be carried forward to reduce taxable income or taxes payable in a future year; a tax credit carryforward is the amount by which tax credits available for utilization exceed statutory limitations.

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