THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Total revenues	$ 163,148	$ 102,823	$ 309,823	$ 201,825
Cost of revenues	47,178	34,433	88,265	68,164
Gross profit	115,970	68,390	221,558	133,661
Operating expenses:
Research and development	62,576	49,506	120,694	97,843
Sales and marketing	23,366	18,723	45,924	38,002
General and administrative	10,670	9,461	20,371	17,676
Total operating expense	96,612	77,690	186,989	153,521
Loss from operations	19,358	(9,300)	34,569	(19,860)
Other income (loss), net (Note 11)	912	357	(1,557)	591
Income (loss) before taxes on income	20,270	(8,943)	33,012	(19,269)
(Provision for) benefit from taxes on income	1,022	(76)	3,268	578
Net income (loss)	$ 19,248	$ (8,867)	$ 29,744	$ (19,847)
Net income (loss) per share - basic (in dollars per share)	$ 0.42	$ (0.20)	$ 0.65	$ (0.45)
Net income (loss) per share - diluted (in dollars per share)	$ 0.40	$ (0.20)	$ 0.63	$ (0.45)
Statement of comprehensive loss:
Net income (loss)	$ 19,248	$ (8,867)	$ 29,744	$ (19,847)
Total comprehensive income (loss), net of tax	24,467	(8,816)	35,788	(20,516)
Statement of cash flows:
Net income (loss)	$ 19,248	(8,867)	29,744	(19,847)
Net cash provided by operating activities			87,100	17,954
Net cash provided by financing activities			$ 9,273	6,426
As reported
Total revenues		102,574		201,279
Cost of revenues		34,292		68,111
Gross profit		68,282		133,168
Operating expenses:
Research and development		49,506		97,843
Sales and marketing		18,723		38,002
General and administrative		9,461		17,676
Total operating expense		77,690		153,521
Loss from operations		(9,408)		(20,353)
Other income (loss), net (Note 11)		357		591
Income (loss) before taxes on income		(9,051)		(19,762)
(Provision for) benefit from taxes on income		76		(578)
Net income (loss)		$ (8,975)		$ (20,340)
Net income (loss) per share - basic (in dollars per share)		$ (0.20)		$ (0.46)
Net income (loss) per share - diluted (in dollars per share)		$ (0.20)		$ (0.46)
Statement of comprehensive loss:
Net income (loss)		$ (8,975)		$ (20,340)
Total comprehensive income (loss), net of tax		(8,924)		(21,009)
Statement of cash flows:
Net income (loss)		(8,975)		(20,340)
Net cash provided by operating activities				17,832
Net cash provided by financing activities				6,548
Adjustments
Total revenues		249		546
Cost of revenues		141		53
Gross profit		108		493
Operating expenses:
Loss from operations		108		493
Income (loss) before taxes on income		108		493
Net income (loss)		108		$ 493
Net income (loss) per share - basic (in dollars per share)				$ 0.01
Net income (loss) per share - diluted (in dollars per share)				$ 0.01
Statement of comprehensive loss:
Net income (loss)		108		$ 493
Total comprehensive income (loss), net of tax		108		493
Statement of cash flows:
Net income (loss)		108		493
Net cash provided by operating activities				122
Net cash provided by financing activities				(122)
As revised
Total revenues		102,823		201,825
Cost of revenues		34,433		68,164
Gross profit		68,390		133,661
Operating expenses:
Research and development		49,506		97,843
Sales and marketing		18,723		38,002
General and administrative		9,461		17,676
Total operating expense		77,690		153,521
Loss from operations		(9,300)		(19,860)
Other income (loss), net (Note 11)		357		591
Income (loss) before taxes on income		(8,943)		(19,269)
(Provision for) benefit from taxes on income		76		(578)
Net income (loss)		$ (8,867)		$ (19,847)
Net income (loss) per share - basic (in dollars per share)		$ (0.20)		$ (0.45)
Net income (loss) per share - diluted (in dollars per share)		$ (0.20)		$ (0.45)
Statement of comprehensive loss:
Net income (loss)		$ (8,867)		$ (19,847)
Total comprehensive income (loss), net of tax		(8,816)		(20,516)
Statement of cash flows:
Net income (loss)		$ (8,867)		(19,847)
Net cash provided by operating activities				17,954
Net cash provided by financing activities				$ 6,426