INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Components of income (loss) before income taxes

The components of income (loss) before taxes on income are as follows:

	Year ended December 31,
	2017			2016			2015
	(in thousands)
United States	$	(21,528	)	$	(17,969	)	$	(12,539	)
Foreign	(375		)	42,297			87,121
Income (loss) before taxes on income	$	(21,903	)	$	24,328		$	74,582

Schedule of the components of the provision for income taxes

The components of the provision for (benefit from) income taxes are as follows:

	Year ended December 31,
	2017			2016			2015
	(in thousands)
Current:
U.S. federal	$	(617	)	$	(1,333	)	$	(1,578	)
State and local	632			220			284
Foreign	(261		)	6,161			5,737
Total current	(246		)	5,048			4,443
Deferred:
Foreign	(2,232		)	762			(22,755		)
Total deferred	(2,232		)	762			(22,755		)
Provision for (benefit from) taxes on income	$	(2,478	)	$	5,810		$	(18,312	)

Schedule of significant deferred tax assets and liabilities

At December 31, 2017 and 2016, significant deferred tax assets and liabilities are as follows:

	December 31,
	2017			2016
	(in thousands)
Deferred tax assets:
Net operating loss and credit carryforwards	$	42,820		$	75,350
Reserves and accruals	11,305			13,841
Depreciation and amortization	2,393			358
Other	6,645			7,128
Gross deferred tax assets	63,163			96,677
Valuation allowance	(31,648		)	(55,827		)
Total deferred tax assets	31,515			40,850
Intangible assets	(6,952		)	(18,437		)
Total deferred tax liabilities	(6,952		)	(18,437		)
Net deferred tax assets	$	24,563		$	22,413

Schedule of reconciliation of the statutory federal income tax rate to the Company's effective tax rate

The reconciliation of the statutory federal income tax rate to the Company's effective tax rate is as follows:

	December 31,
	2017		2016		2015
Tax at statutory rate	35.0	%	35.0	%	35.0	%
Tax at rates other than the statutory rate	(4.8	)	(84.5	)	(42.5	)
Valuation allowance	47.3		40.8		(22.0	)
Net change in tax reserves	8.0		17.1		6.0
Adjustment of deferred tax balances following changes in tax rates	(71.8	)	10.9		—
Other, net	(2.4	)	4.6		(1.1	)
Provision for (benefit from) taxes on income	11.3	%	23.9	%	(24.6	)%

Schedule of reconciliation of unrecognized tax benefits, excluding penalties and interest

The following summarizes the activity related to the Company's unrecognized tax benefits:

	December 31,
	2017			2016			2015
	(in thousands)
Gross unrecognized tax benefits, beginning of the period	$	41,460		$	25,382		$	18,037
Increases in tax positions for prior years	3,655			252			1,153
Decreases in tax positions for prior years	—			—			(131		)
Increases in tax positions for current year	8,090			8,131			7,908
Increases in tax positions acquired or assumed in a business combination	—			8,990			—
Decreases due to lapses of statutes of limitations	(8,051		)	(1,295		)	(1,585		)
Gross unrecognized tax benefits, end of the period	$	45,154		$	41,460		$	25,382