Significant Accounting Policies - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Significant Accounting Policies [Line Items]
Deferred revenue	$ 2,000,000		$ 1,600,000
Sales commissions	237,000	452,000
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	27,600,000
Debt Conversion Converted Instrument Into Common Stock Approximate Value	14,300,000
Number of warrants not included in ant diluted shares	12,131,152
Customer Payment [Member]
Significant Accounting Policies [Line Items]
Deferred revenue	$ 694,000