Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net Income per Share [Abstract]
Net income		$ 2,409	$ 5,815	$ 5,119	$ 11,221
Basic [Abstract]
Weighted-average shares of common stock outstanding		32,942	33,994	33,161	33,953
Shares used in computing basic net income per share (in shares)		32,942	33,994	33,161	33,953
Effect of dilutive securities:
Restricted stock subject to vesting (in shares)		262	373	393	416
Contingently issuable shares (in shares)		0	0	0	4	[1]
Shares issuable for acquisition consideration (in shares)	[2]	543	476	526	518
Shares used in computing diluted net income per share (in shares)		33,747	34,843	34,080	34,891
Basic net income per share (in dollars per share)		$ 0.07	$ 0.17	$ 0.15	$ 0.33
Diluted net income per share (in dollars per share)		$ 0.07	$ 0.17	$ 0.15	$ 0.32
Anti-dilutive options and restricted stock not included in the calculation of diluted net income per share (in shares)		228	0	175	1

[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, 2017, 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 Asset Purchase Agreement with The Pup Group, Inc. d/b/a Enlighten ("Enlighten"); (iv) the Asset Purchase Agreement with RAS & Associates, LLC ("RAS"); and (v) the Asset Purchase Agreement with Clarity Consulting, Inc. and Truth Labs, LLC. (together, "Clarity"), as part of the consideration. 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; (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 Enlighten, as part of the consideration.