COMMON AND PREFERRED STOCK (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended		12 Months Ended					1 Months Ended							1 Months Ended			1 Months Ended				1 Months Ended			0 Months Ended	12 Months Ended			1 Months Ended						0 Months Ended
	May 25, 2012	Jan. 19, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 07, 2012	Jan. 20, 2006	Feb. 29, 2012 IPO [Member]	Feb. 29, 2012 IPO [Member] Underwriting Discounts and Commissions [Member]	Feb. 29, 2012 IPO [Member] Offering expenses [Member]	Jan. 20, 2006 Private Placement [Member]	Feb. 29, 2012 Common Stock [Member] IPO [Member]	Feb. 07, 2012 Common Stock [Member] IPO [Member]	Jan. 20, 2006 Common Stock [Member] Private Placement [Member]	Feb. 29, 2012 Stockholders [Member] IPO [Member]	Dec. 31, 2011 Series A-1 Convertible Redeemable Preferred Stock [Member]	Jan. 20, 2006 Series A-1 Convertible Redeemable Preferred Stock [Member]	Jan. 20, 2006 Series A-1 Convertible Redeemable Preferred Stock [Member] Private Placement [Member]	Jan. 19, 2010 Series A-2 Convertible Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series A-2 Convertible Redeemable Preferred Stock [Member]	Feb. 19, 2008 Series A-2 Convertible Redeemable Preferred Stock [Member]	Feb. 19, 2008 Series A-2 Convertible Redeemable Preferred Stock [Member] Private Placement [Member]	Jan. 19, 2010 Series A-2 Convertible Redeemable Preferred Stock [Member] Private Placement [Member]	Apr. 15, 2010 Series A-3 Convertible Preferred Stock [Member]	Apr. 15, 2010 Series A-3 Convertible Preferred Stock [Member] Private Placement [Member]	Dec. 31, 2012 Instant Information Inc [Member]	Dec. 31, 2013 Empathy Lab LLC [Member]	Dec. 31, 2012 Thoughtcorp Inc [Member]	Jan. 20, 2006 Redemption [Member] Series A-1 Convertible Redeemable Preferred Stock [Member]	Jan. 19, 2010 Redemption [Member] Series A-2 Convertible Redeemable Preferred Stock [Member]	Jan. 20, 2006 Liquidation [Member] Series A-1 Convertible Redeemable Preferred Stock [Member]	Jan. 19, 2010 Liquidation [Member] Series A-2 Convertible Redeemable Preferred Stock [Member]	Jan. 19, 2010 Liquidation [Member] Series A-2 Convertible Redeemable Preferred Stock [Member] Minimum [Member] Hurdle amount [Member]	Jan. 19, 2010 Liquidation [Member] Series A-2 Convertible Redeemable Preferred Stock [Member] Maximum [Member]	Apr. 15, 2010 Liquidation [Member] Series A-3 Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Common stock, stock split ratio (in shares)		8
Common stock, shares authorized (in shares)		160,000,000	160,000,000	160,000,000
Preferred stock, shares authorized (in shares)		40,000,000
Common stock sold pursuant to over-allotment option granted to underwriters (in shares)												900,000
Sale of stock price per share (in dollars per share)													$ 12.00	$ 1.13				$ 12.17				$ 74.07	$ 51.85		$ 51.85
Issuance of common stock in initial public offering (in shares)			47,569,463	45,398,523		2,900,000
Gross proceeds from issuance of common stock								$ 34,800
Net proceeds from issuance of stock												28,969						8,000				47,601			14,971
Payment for stock issuance costs			0	1,765	1,630				2,436	3,395												2,399
Stock issued in connection with acquisition (in shares)																										53,336
Stock issued in connection with acquisition																										640	(13)	3,607
Common Stock Share Sold								6,900,000							4,000,000
Conversion of preferred stock (in shares)								21,840,128
Issuance of preferred stock (in shares)																	657,354				675,081			290,277
Common Shares Converted to Preferred Stock											11,180,648
Stock Issued During Period Shares Convertible Preferred New Issues																		1,397,581
Deemed dividend							6,803
Compounded annual rate of return (in hundredths))																													12.50%	12.50%	12.50%	12.50%	17.00%	18.00%
Accretion expense					17,563
Redemption value																41,245				44,695
Gross proceeds from issuance of preferred stock																						50,000
Repurchase and retirement of Series A-2 convertible redeemable preferred stock (in shares)																			290,277
Repurchase and retirement of Series A-2 convertible redeemable preferred stock																			$ 15,050
Percentage of liquidation price to cash and non-cash proceeds (in hundredths)																																17.10%
Put option expiry (in shares)					56,896
Percentage of equity securities subject to liquidation evaluation (in hundredths)																																100.00%			100.00%
Treasury stock retired (in shares)	38,792
Features of Convertible Preferred Stock [Abstract]
Conversion of preferred stock (in shares)								21,840,128