Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended						1 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Minimum	Dec. 31, 2013 Maximum	Dec. 31, 2013 Discontinued Operations	Dec. 31, 2012 Discontinued Operations	Feb. 28, 2010 Faigin Matter	Aug. 31, 2007 Colburn Matter	Jun. 30, 2011 Walker Matter	Dec. 31, 2013 Breach Of Employment Contracts LegalMatter
Commitments And Contingencies Disclosure [Line Items]
Court awarded amount to plaintiff							$ 1,400,000
Damages sought by Signature	4,600,000
Plaintiff superior court claim								3,200,000	4,600,000
Total amount claimed by plaintiff								2,600,000	2,500,000
Number of Bankruptcy claims filed										2
Bankruptcy claims filed in court										5,100,000
Operating Leases, Rent Expense, Net	$ 500,000	$ 500,000			$ 24,000	$ 41,000
Operating lease term			1 year	10 years