Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments And Contingencies Disclosure [Abstract]
Operating lease expiration period	2017
Rent expense	$ 100,000	$ 300,000	$ 300,000
Additional charges under lease for real estate taxes and common maintenance charges	20,000	10,000	30,000
Standby letter of credit amount	246,000
Liabilities recorded for indemnification provisions	$ 0