Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended			12 Months Ended			12 Months Ended				1 Months Ended		12 Months Ended
	Jan. 31, 2013	Dec. 31, 2012	Nov. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Jun. 05, 2013	Dec. 31, 2012 Officer item	Dec. 31, 2013 Board of director	Dec. 31, 2012 Board of director	Dec. 31, 2013 Employees	Mar. 31, 2013 Anomalous	Jan. 31, 2012 Anomalous	Dec. 31, 2013 Anomalous	Dec. 31, 2012 Anomalous
Common Stock
Common stock, par value (in dollars per share)		$ 0.0001		$ 0.0001	$ 0.0001
Common stock, shares authorized		150,000,000		150,000,000	150,000,000
Common stock, shares issued		37,613,327		38,160,928	37,613,327
Common stock, shares outstanding		37,613,327		38,160,928	37,613,327
Unregistered shares of common stock issued as a consideration												165,775		165,775
Unvested and unregistered shares of common stock with vesting based upon achievement of revenue targets												132,617		132,617
Unvested and unregistered shares of common stock cancelled and retired											132,617		132,617
Shares issued							9,639	58,975	1,021	17,941
Common stock reserved for issuance						1,000,000
Number of officers							2
Authorized amount of shares repurchased			$ 20
Shares repurchased				519,760	357,751
Average price of shares repurchased and retired (in dollars per share)				$ 13.26	$ 12.29
Amount of shares repurchased and retired				$ 6.9	$ 4.4
Shares settled and retired	141,200	216,551
Settlement convention trading period				3 days
Preferred Stock
Preferred stock, par value (in dollars per share)		$ 0.0001		$ 0.0001	$ 0.0001
Preferred stock, shares authorized		5,000,000		5,000,000	5,000,000
Preferred stock, shares issued		0		0	0
Preferred stock, shares outstanding		0		0	0