Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended				401 Months Ended
	Nov. 30, 2011	Dec. 31, 2013 Segment	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments		1
U.S. government receivables unbilled amount		$ 2,400,000	$ 3,200,000			$ 2,400,000
Construction in progress		11,300,000				11,300,000
Tenant improvement from the landlord		6,200,000				6,200,000
Impairment charge on real estate owned				109,000	400,000	1,445,000
Third party lease commitment	70.00%
Third party optional lease termination date	2014-11
Property and equipment, gross		32,377,000	20,105,000			32,377,000
Remaining term of ground lease	30 years
Interest income and other		200,000	100,000
Depreciation expense		800,000	1,000,000	800,000
Net deferred tax assets		0				0
Restricted investments		7,900,000	0			7,900,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Third party monthly payment	14,500
Optional purchase price of leased building for third party	2,000,000
Maximum
Summary Of Significant Accounting Policies [Line Items]
Third party monthly payment	15,500
Optional purchase price of leased building for third party	2,200,000
Patents
Summary Of Significant Accounting Policies [Line Items]
Patent amortization expense		400,000	600,000	500,000
Book value of patent abandoned		500,000	400,000	200,000		500,000
Initial term of patents		20 years
Expected amortization expenses, year one		500,000				500,000
Expected amortization expenses, year two		500,000				500,000
Expected amortization expenses, year three		500,000				500,000
Expected amortization expenses, year four		500,000				500,000
Expected amortization expenses, year five		500,000				500,000
Building
Summary Of Significant Accounting Policies [Line Items]
Lease expiration date	Mar. 31, 2017
Property and equipment, gross	$ 1,900,000	$ 1,856,000	$ 1,856,000			$ 1,856,000
Property and equipment, estimated useful lives	30 years	30 years