Weighted Average Contractual Life and Exercise Price (Detail) (Stock Option Plan, USD $)	12 Months Ended
	Dec. 31, 2013
Stock Option Plan
Number of Options
Options outstanding	2,517,911
Options vested	2,470,411
Weighted Average Remaining Contractual Life
Options outstanding	4 years 8 months 12 days
Options vested	4 years 8 months 12 days
Weighted Average Exercise Price
Options outstanding	$ 1.33
Options vested	$ 1.28