Stockholders' Equity (Narrative) (Detail) (USD $)	0 Months Ended	3 Months Ended		12 Months Ended			0 Months Ended	3 Months Ended				12 Months Ended			12 Months Ended			3 Months Ended			12 Months Ended	3 Months Ended
	Dec. 20, 2011	Dec. 31, 2013	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Aug. 11, 2011 Adxpose Inc [Member]	Sep. 30, 2012 Upon Achievement Of 100%[Member]	Sep. 30, 2012 Upon Achievement Of 200%[Member]	Sep. 30, 2012 Chief Executive Officer [Member]	Sep. 30, 2012 Executive Management [Member]	Dec. 31, 2013 1999 Stock Option Plan And 2007 Equity Incentive Plan [Member]	Dec. 31, 2012 1999 Stock Option Plan And 2007 Equity Incentive Plan [Member]	Dec. 31, 2013 2007 Equity Incentive Plan [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Sep. 30, 2012 Time Based Restricted Stock Awards [Member] Chief Executive Officer [Member]	Sep. 30, 2012 Time Based Restricted Stock Awards [Member] Executive Management [Member]	Sep. 30, 2012 Restricted Stock And Restricted Stock Units [Member]	Dec. 31, 2013 Restricted Stock And Restricted Stock Units [Member]	Sep. 30, 2012 Restricted Stock And Restricted Stock Units [Member] Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)		1,800,000		1,800,000								9,900,000	8,500,000
Percentage common stock outstanding shares				4.00%
Vesting period of options granted, in years				4 years						3 years	4 years								3 years
Options expiration period from date of grant, in years				10 years
Increase in number of shares available for grant (in shares)												1,427,177
Shares available for grant (in shares)														3,066,148
Number of shares eligible to vest for three years (in shares)				1,509,117	2,152,268	925,657		290,000							484,052	1,706,900	681,674	210,000	380,000			580,000
Number of shares eligible to vest for three years (in shares)									580,000
Weighted percentage of revenue and adjusted EDITDA goals			50.00%
Target Performance Metric, Percentage								100.00%	200.00%
Number of shares eligible to vest for given years (in shares)								96,666	193,334
Aggregate intrinsic value of options exercised				$ 1,028,000	$ 5,000,000	$ 3,600,000
Aggregate intrinsic value of options outstanding		927,000		927,000	851,000
Option Outstanding, Weighted Average Remaining Contractual Life (Years)				2 years 1 month 2 days
Weighted-average remaining contractual term for options outstanding (in years)				2 years 1 month 2 days	2 years 11 months 27 days
Right of repurchase of shares awarded, lapse rate				(25.00%)
Restricted stock forfeited (in shares)															206,360
Aggregate intrinsic value for non-vested shares		62,500,000		62,500,000
Weighted average remaining contractual term for non-vested shares (in years)				1 year 1 month 6 days
Weighted-average period expected to recognize compensation expense (in years)																					1 year 2 months 5 days
Total unrecognized compensation expense																					27,100,000
Restricted stock units vested (in shares)				1,397,443	1,056,922	868,736									1,196,792	888,707	751,873
Repurchase of common stock (in shares)		483,437																			510,328
Aggregate purchase price of shares repurchased																				$ 9,300,000
Common stock outstanding (in shares)						24,375
Common stock issued for warrant exercised (in shares)			19,895
Number of shares issued as consideration	974,358						982,285