Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Net Income Per Share [Abstract]
Net income	$ 5,513	$ 7,234	$ 4,562	$ 4,123	$ 4,376	$ 5,142	$ 3,603	$ 2,986	$ 21,432		$ 16,107		$ 10,747
Shares used in computing basic net income per share (in shares)									30,294		29,536		27,745
Effect of dilutive securities:
Stock options (in shares)									152		194		279
Warrants (in shares)									0	[1]	0	[1]	5	[1]
Restricted stock subject to vesting (in shares)									674		621		578
Contingently issuable shares (in shares)									0	[2]	81	[2]	222	[2]
Shares issuable for acquisition consideration (in shares)									688	[3]	654	[3]	355	[3]
Shares used in computing diluted net income per share (in shares)									31,808		31,086		29,184
Basic net income per share (in dollars per share)	$ 0.18	$ 0.24	$ 0.15	$ 0.14	$ 0.14	$ 0.17	$ 0.12	$ 0.10	$ 0.71		$ 0.54		$ 0.39
Diluted net income per share (in dollars per share)	$ 0.17	$ 0.23	$ 0.14	$ 0.13	$ 0.14	$ 0.16	$ 0.12	$ 0.10	$ 0.67		$ 0.52		$ 0.37
Anti-dilutive options and restricted stock not included in the calculation of diluted net income per share									1		12		278

[1] All outstanding warrants expired on December 30, 2011.

[2] Represents the Company’s estimate of shares to be issued to Exervio pursuant to the Asset Purchase Agreement.

[3] 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; (iii) the Asset Purchase Agreement with Nascent; and (iv) the Agreement and Plan of Merger with Northridge as part of the consideration. For the year ended December 31, 2011 this represents the shares held in escrow pursuant to the Agreement and Plan of Merger with speakTECH and pursuant to the Asset Purchase Agreement with Exervio and the Asset Purchase Agreement with JCB as part of the consideration. These shares were not included in the calculation of basic net income per share due to the uncertainty of their ultimate status.