Stock-Based Compensation - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, Nonemployee, Fair Value Increase (Decrease)	$ 174
Consultants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	164
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	404
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation costs	$ 20,285
Recognition over weighted average periods	2 years 10 months 9 days
Stock Options [Member] | Consultants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years 6 months
Restricted Stock Units (RSUs) [Member] | Consultants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	25
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 months 12 days