Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Temporary Equity, Shares Outstanding		28,820
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Temporary Equity, Carrying Amount, Attributable to Parent		$ 52,571
Beginning Balance (in shares) at Dec. 31, 2012			11,401
Beginning Balance at Dec. 31, 2012	$ (34,562)			$ 18,133	$ 95	$ (52,790)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options (in shares)			454
Exercise of common stock options	866			866
Stock-based compensation	6,533			6,533
Foreign exchange translation adjustment	1				1
Unrealized loss on investments, net of tax	0
Net income (loss)	(9,249)					(9,249)
Ending Balance (in shares) at Dec. 31, 2013			11,855
Ending Balance at Dec. 31, 2013	(36,411)			25,532	96	(62,039)
Temporary Equity, Shares Outstanding		28,820
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Temporary Equity, Carrying Amount, Attributable to Parent		$ 52,571
Exercise of common stock options (in shares)			1,360
Exercise of common stock options	3,498			3,498
Restricted stock awards, net (in shares)			2,168
Shares withheld related to net share settlement (in shares)			(174)
Shares withheld related to net share settlement	(2,324)			(2,324)
Issuance of common stock related to RSU vesting (in shares)			4
Issuance of common stock related to acquisition (in shares)			841
Issuance of common stock related to acquisition	13,342			13,342
Stock-based compensation	24,470			24,470
Foreign exchange translation adjustment	(104)				(104)
Unrealized loss on investments, net of tax	0
Net income (loss)	$ (18,673)					(18,673)
Ending Balance (in shares) at Dec. 31, 2014	37,192		37,192
Ending Balance at Dec. 31, 2014	$ 128,752		$ 0	209,472	(8)	(80,712)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period Shares, Stock Warrants Net Exercised		572
Stock Issued During Period, Value, Stock Warrants Net Exercised	5,983			5,983
Stock Issued During Period, Shares, Conversion of Convertible Securities		(29,392)	(14,696)
Stock Issued During Period, Value, Conversion of Convertible Securities	52,571	$ (52,571)		52,571
Adjustments to Additional Paid in Capital, Warrant Issued	200			200
Stock Issued During Period, Shares, New Issues			6,432
Stock Issued During Period, Value, New Issues	86,200			86,200
Net Exercise Of Warrant, Shares, Common Stock			10
Temporary Equity, Shares Outstanding		0
Temporary Equity, Carrying Amount, Attributable to Parent		$ 0
Exercise of common stock options (in shares)			2,552
Exercise of common stock options	13,533			13,533
Restricted stock awards, net (in shares)			479
Issuance of common stock related to RSU vesting (in shares)			229
Issuance of common stock related to employee stock purchase plan (in shares)			170
Issuance of common stock related to employee stock purchase plan	2,040			2,040
Issuance of common stock and exchange of stock options related to acquisition (in shares)			4,425
Issuance of common stock and exchange of stock options related to acquisition	76,350			76,350
Issuance of common stock for contingent consideration associated with acquisitions (in shares)			1,553
Issuance of common stock for contingent consideration associated with acquisitions	25,608			25,608
Stock-based compensation	31,403			31,403
Foreign exchange translation adjustment	61				61
Unrealized loss on investments, net of tax	(68)				(68)
Net income (loss)	$ 422					422
Ending Balance (in shares) at Dec. 31, 2015	46,600		46,600
Ending Balance at Dec. 31, 2015	$ 278,101		$ 0	$ 358,406	$ (15)	$ (80,290)
Temporary Equity, Shares Outstanding		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Temporary Equity, Carrying Amount, Attributable to Parent		$ 0