Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Net Income Per Share [Abstract]
Net income	$ 6,424	$ 7,306	$ 6,387	$ 3,045	$ 5,513	$ 7,234	$ 4,562	$ 4,123	$ 23,163		$ 21,432		$ 16,107
Basic [Abstract]
Weighted-average shares of common stock outstanding									31,698		30,294		29,536
Shares used in computing basic net income per share (in shares)									31,698		30,294		29,536
Effect of dilutive securities [Abstract]
Contingently issuable shares (in shares)									13	[1]	0	[1]	81	[1]
Shares issuable for acquisition consideration (in shares)									833	[2]	688	[2]	654	[2]
Shares used in computing diluted net income per share (in shares)									33,158		31,808		31,086
Basic net income per share (in dollars per share)	$ 0.20	$ 0.23	$ 0.20	$ 0.10	$ 0.18	$ 0.24	$ 0.15	$ 0.14	$ 0.73		$ 0.71		$ 0.54
Diluted net income per share (in dollars per share)	$ 0.19	$ 0.22	$ 0.19	$ 0.09	$ 0.17	$ 0.23	$ 0.14	$ 0.13	$ 0.70		$ 0.67		$ 0.52
Anti-dilutive options and restricted stock not included in the calculation of diluted net income per share									73		1		12
Stock Options [Member]
Effect of dilutive securities [Abstract]
Stock-based compensation (in shares)									61		152		194
Restricted Stock [Member]
Effect of dilutive securities [Abstract]
Stock-based compensation (in shares)									553		674		621

[1] For the year ended December 31, 2014, this represents the Company's estimate of shares to be issued to Clear Task, Inc. pursuant to the Asset Purchase Agreement. For the year ended December 31, 2012, this represents the Company's estimate of shares to be issued to Exervio Consulting , Inc. pursuant to the Asset Purchase Agreement.

[2] For the year ended December 31, 2014, this represents the shares held in escrow pursuant to: (i) the Agreement and Plan of Merger with Northridge Systems, Inc. ("Northridge"); (ii) the Asset Purchase Agreement with Nascent Systems, LP ("Nascent") ; (iii) the Agreement and Plan of Merger with TriTek Solutions, Inc. ("TriTek"); (iv) the Asset Purchase Agreement with Clear Task, Inc. ("Clear Task"); (v) the Asset Purchase Agreement with CoreMatrix Systems, LLC ("CoreMatrix"); (vi) the Agreement and Plan of Merger with ForwardThink Group Inc. ("ForwardThink"); (vii) the Asset Purchase Agreement with BioPharm Systems, Inc.("BioPharm"); and (viii) the Asset Purchase Agreement with Trifecta Technologies, Inc. and Trifecta Technologies Canada, Limited ("Trifecta") as part of the consideration. For the year ended December 31, 2013, this represents the shares held in escrow pursuant to: (i) the Agreement and Plan of Merger with Northridge; (ii) the Asset Purchase Agreement with Nascent; (iii) the Agreement and Plan of Merger with TriTek; (iv) the Asset Purchase Agreement with Clear Task; and (v) the Asset Purchase Agreement with CoreMatrix as part of the consideration. For the year ended December 31, 2012, this represents the shares held in escrow pursuant to: (i) the Agreement and Plan of Merger with speakTECH; (ii) the Asset Purchase Agreement with PointBridge Solutions, LLC; (iii) the Asset Purchase Agreement with Nascent; and (iv) the Agreement and Plan of Merger with Northridge as part of the consideration.