Stock Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock options vested	$ 920,000
Options, granted	669,030
Weighted-average grant date fair value	5.30	1.59	1.83
Exercised, aggregate intrinsic value	681,000	161,000	0
Unrecognized compensation cost	$ 4,100,000
Unrecognized compensation cost, weighted-average recognized period	3 years
Exercise Prices that Were Less than the Estimated per Share Value [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, granted	101,487	988,268
2004 Stock Option Plan and 2013 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares authorized for issuance	3,948,533
Stock options grant period, years	10 years
Stock options vesting period and exercisable period, years	4 years