Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional paid-in capital	Treasury Stock	Accumulated other comprehensive income (loss)	Accumulated deficit	Total
Stockholders' equity, beginning balance at Dec. 31, 2012	$ 11	$ 562,692	$ (25,932)	$ 15	$ (64,595)	$ 472,191
Common stock shares outstanding, beginning balance at Dec. 31, 2012	17,386
Issuance of stock under employee stock awards and other, net		7,059				7,059
Issuance of stock under employee stock awards and other, net, shares	452
Stock option windfall tax benefits		88				88
Stock-based compensation		24,908				24,908
Unrealized gain on marketable securities				562		562
Issuance of common stock for acquisitions, value		16,281				16,281
Issuance of common stock for acquisitions, shares	416
Repurchases of common stock to be held in treasury, shares	(112)
Repurchases of common stock to be held in treasury, value			(4,835)			(4,835)
Foreign currency translation adjustment				(75)		(75)
Net loss					(20,174)	(20,174)
Stockholders' equity ending balance at Dec. 31, 2013	$ 11	611,028	(30,767)	502	(84,769)	496,005
Common stock shares outstanding, ending balance at Dec. 31, 2013	18,142
Issuance of stock under employee stock awards and other, net		344				344
Issuance of stock under employee stock awards and other, net, shares	549
Stock-based compensation		20,202				20,202
Issuance of common stock for acquisitions, value		10,258				10,258
Issuance of common stock for acquisitions, shares	1,050
Spin-off of Rightside, Ltd.		(144,032)				(144,032)
Reverse split	$ (9)	9
Realized gain on marketable securities				(565)		(565)
Foreign currency translation adjustment				(13)		(13)
Net loss					(267,357)	(267,357)
Stockholders' equity ending balance at Dec. 31, 2014	$ 2	497,809	(30,767)	(76)	(352,126)	$ 114,842
Common stock shares outstanding, ending balance at Dec. 31, 2014	19,741					19,741
Issuance of stock under employee stock awards and other, net		464				$ 464
Issuance of stock under employee stock awards and other, net, shares	290
Issuance of stock for acquisition holdback	123
Stock-based compensation		7,330				7,330
Foreign currency translation adjustment				(15)		(15)
Net loss					(43,501)	(43,501)
Stockholders' equity ending balance at Dec. 31, 2015	$ 2	$ 505,603	$ (30,767)	$ (91)	$ (395,627)	$ 79,120
Common stock shares outstanding, ending balance at Dec. 31, 2015	20,154					20,154