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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		12 Months Ended					3 Months Ended			3 Months Ended
	Mar. 31, 2013 Customer	Mar. 31, 2012	Dec. 31, 2012 Customer	Mar. 31, 2013 Product Warranty	Dec. 31, 2012 Product Warranty	Aug. 31, 2009 2009 Unit Offering Warrant	Nov. 30, 2010 2010 Unit Offering Warrant	Mar. 31, 2013 Maximum	Mar. 31, 2013 Minimum	Dec. 31, 2012 Minimum	Mar. 31, 2013 Minimum Available-for-sale Securities
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue	$ 174,000		$ 77,000
Highly liquid investments, original maturities								3 months
Short-term investments, original maturities								1 year	3 months		1 year
Number of major customers representing outstanding trade receivables	4		3
Cumulative outstanding trade receivables percentage by major customers	63.00%		59.00%						10.00%	10.00%
Life of inventory	2 years
Protracted length of inventory	1 year
Inventory valuation reserves	400,000		300,000
Estimated useful life of property and equipment								5 years	3 years
Estimated useful life of intangible assets	10 years
Impairment charges on long-lived assets	0	0
Foreign currency gains (losses)	(54,000)	371,000
Warrants to purchase an aggregate shares of common stock						2.4	3.7
Derecognition of tax positions, Maximum								50.00%
Company's tax years subject to examination by the taxing jurisdictions								2012	1998
Unrecognized Tax Benefits	0	0
Current asset, warrant claim	418,000		2,038,000	300,000	1,800,000
Inventory write down			$ 1,700,000
Period of warranty	1 year

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