Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (46,680)		$ (16,160)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	2,613		1,935
Stock-based compensation	26,106		9,858
Amortization of acquired intangibles	917		0
Amortization of premiums/accretion of discounts on short-term investments	318		547
Excess tax benefits from share-based compensation	(20)		0
Changes in operating assets and liabilities:
Accounts receivable, net	8,909		(1,076)
Inventory	153		(213)
Prepaid expenses and other assets	713		(654)
Accounts payable	(765)		(734)
Accrued compensation and benefits	498		2,547
Accrued and other liabilities	220		(146)
Severance pay (net)	42		16
Deferred revenue	5,895		6,357
Deferred tax assets	(6)		(16)
Other	0		(12)
Net cash provided by (used in) operating activities	(1,087)		2,249
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of short-term investments	(26,899)		(29,825)
Proceeds from sales/maturities of short-term investments	29,821		36,241
Acquisitions, net of cash acquired	(12,083)		0
Purchase of property and equipment	(3,694)		(1,753)
Change in restricted cash	(323)		58
Net cash provided by (used in) investing activities	(13,178)		4,721
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock, net of repurchases	3,342		4,674
Excess tax benefits from share-based compensation	20		0
Net cash provided by financing activities	3,362		4,674
Effect of exchange rate changes on cash and cash equivalents	0		(205)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(10,903)		11,439
CASH AND CASH EQUIVALENTS - Beginning of period	76,704	[1]	59,201
CASH AND CASH EQUIVALENTS - End of period	65,801		70,640
NONCASH INVESTING AND FINANCING ACTIVITIES:
Vesting of restricted and early exercised stock options	427		600
Common stock issued in connection with acquisitions	$ 24,164		$ 0

[1] The Condensed Consolidated Balance Sheet as of December 31, 2013 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.