Stock-Based Compensation and Stock Purchase Plans - Restricted Stock - Additional Information (Detail) (Restricted Stock [Member], USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jul. 13, 2013 Director [Member]	Dec. 31, 2013 Director [Member]	Jul. 13, 2013 Employee [Member]	Dec. 31, 2013 Employee [Member]	Dec. 31, 2012 Newly Hired Employees [Member]	Dec. 31, 2011 Newly Hired Employees [Member]
Schedule Of Share Based Compensation Arrangements [Line Items]
Option vesting period					1 year		3 years
Granted, Shares	190,002	0	179,050	100,002		90,000		2,000	2,000
Aggregate fair value of awards	$ 0.90	$ 0.01	$ 2.00
Value of the restricted stock vested	1.2	0.8	3.4
Granted, Weighted-Average Grant - Date Fair Value	$ 4.80	$ 5.85	$ 11.21
Unrecognized compensation cost	$ 0.8
Expected weighted average period of recognizing compensation cost	1 year 4 months 24 days