Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended			389 Months Ended	1 Months Ended			12 Months Ended					1 Months Ended			12 Months Ended	1 Months Ended	12 Months Ended
	Nov. 11, 2011	Dec. 31, 2012 Segment	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Nov. 11, 2011 Minimum	Nov. 11, 2011 Maximum	Dec. 31, 2012 1st March, 2013	Dec. 31, 2012 Patents	Dec. 31, 2011 Patents	Dec. 31, 2010 Patents	Dec. 31, 2012 Leasehold improvements	Dec. 31, 2011 Leasehold improvements	Nov. 11, 2011 Building	Dec. 31, 2012 Building	Dec. 31, 2011 Building	Dec. 31, 2012 Corvallis, Oregon	May 31, 2012 Bothell, Washington	Dec. 31, 2012 Bothell, Washington
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments		1
U.S. government receivables unbilled amount		$ 3,245,000	$ 2,093,000		$ 3,245,000			$ 502,000
Property and equipment, estimated useful lives		5 years										5 years		30 years
Impairment charge on real estate owned		0	109,000	408,000	1,445,000
Third party lease commitment	70.00%
Third party monthly payment						14,500	15,500
Lease expiration date														Mar. 31, 2017				May 31, 2013
Third party optional lease termination date	2014-11
Optional purchase price of leased building for third party						2,000,000	2,200,000
Property and equipment, gross		20,105,000	20,030,000		20,105,000							10,058,000	9,959,000	1,856,000	1,856,000	1,856,000
Remaining term of ground lease	30 years
Interest income and other		135,000
Depreciation expense		975,000	838,000	1,217,000
Patent amortization expense									550,000	462,000	246,000
Book value of patent abandoned									356,000	190,000	766,000
Initial term of patents									20 years
Expected amortization expenses over next five years									432,000
Net deferred tax assets		0			0
Other assets		2,750,000			2,750,000
Manufacturing costs expected to be incurred, year		2014
Operating lease expiration year																	2020		2013
Increase (decrease) in rent expense		$ 103,000	$ 7,000	$ 33,000