Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2016		Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015
Net Income per Share [Abstract]
Net income		$ 5,815		$ 3,997	$ 11,221		$ 8,063
Weighted-average shares of common stock outstanding (in shares)		33,994		33,333	33,953		33,190
Shares used in computing basic net income per share (in shares)		33,994		33,333	33,953		33,190
Stock options (in shares)		0		0	0		1
Restricted stock subject to vesting (in shares)		373		354	416		429
Contingently issuable shares (in shares)		0	[1]	0	4	[1]	0
Shares issuable for acquisition consideration (in shares)	[2]	476		451	518		531
Shares used in computing diluted net income per share (in shares)		34,843		34,138	34,891		34,151
Basic net income per share (in dollars per share)		$ 0.17		$ 0.12	$ 0.33		$ 0.24
Diluted net income per share (in dollars per share)		$ 0.17		$ 0.12	$ 0.32		$ 0.24
Anti-dilutive options and restricted stock not included in the calculation of diluted net income per share (in shares)		0		0	1		54

[1] For the six months ended June 30, 2016, this represents the shares issued to Zeon Solutions Incorporated and certain related entities (collectively, "Zeon") pursuant to the Asset Purchase Agreement.

[2] For the three and six months ended June 30, 2016, this represents the shares held in escrow pursuant to: (i) the Asset Purchase Agreement with BioPharm Systems, Inc. ("BioPharm"); (ii) the Asset Purchase Agreement with Zeon; (iii) the Stock Purchase Agreement for Market Street Solutions, Inc. ("Market Street"); and (iv) the Asset Purchase Agreement with The Pup Group, Inc. ("Enlighten") as part of the consideration. For the three and six months ended June 30, 2015, this represents the shares held in escrow pursuant to: (i) the Agreement and Plan of Merger with ForwardThink Group Inc.; (ii) the Asset Purchase Agreement with BioPharm; (iii) the Asset Purchase Agreement with Trifecta Technologies, Inc. and Trifecta Technologies Canada, Limited; and (iv) the Asset Purchase Agreement with Zeon as part of the consideration.