Significant Accounting Policies - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Significant Accounting Policies [Line Items]
Deferred revenue	$ 1,800,000		$ 1,600,000
Sales commissions	318,000	576,000
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	28,400,000
Debt Conversion Converted Instrument Into Common Stock Approximate Value	14,300,000
Customer Payment [Member]
Significant Accounting Policies [Line Items]
Deferred revenue	$ 733,000