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INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of reconciliation of income taxes at the U.S. Federal statutory rate to the provision for income taxes

A reconciliation of income taxes at the U.S. federal statutory rate to the provision for income taxes is as follows:

	Year Ended December 31,
	2017			2016			2015
U.S. federal statutory rate	35.00	%		35.00	%		35.00	%
State taxes	2.26	%		2.20	%		0.71	%
Foreign taxes	(1.28	)%		(0.81	)%		12.03	%
Change in valuation allowance	4.58	%		(43.96	)%		10.32	%
Stock-based compensation	(1.21	)%		(0.54	)%		7.26	%
Tax credits	4.96	%		8.77	%		(30.63	)%
Interest expense	2.90	%		5.75	%		(37.57	)%
Effect of rate changes	(130.88	)%		(4.65	)%		—	%
Convertible senior notes refinancing	6.55	%		—	%		—	%
Effect of the adoption of ASU 2016-09	68.89	%		—	%		—	%
Other	7.90	%		(2.04	)%		15.33	%
Effective tax rate	(0.33	)%		(0.28	)%		12.45	%

Schedule of significant components of the Company's deferred tax assets

Deferred taxes reflect the tax effects of the differences between the amounts recorded as assets and liabilities for financial reporting purposes and the comparable amounts recorded for income tax purposes. Significant components of the Company’s deferred tax assets and liabilities at December 31, 2017 and 2016 are as follows (in thousands):

	December 31,
	2017				2016
Deferred tax assets:
Net operating loss carry-forwards	$	95,067			$	96,163
Federal and state credits	15,048				13,724
Depreciation and amortization	2,593				2,604
Accruals and reserves	2,743				4,672
Deferred revenue	1,841				3,023
Stock based compensation	16,925				21,890
Inventory	552				9,811
Other	139				52
Total deferred tax assets	134,908				151,939
Deferred tax liabilities:
Discount on convertible senior notes	(14,678		)		(3,186		)
	120,230				148,753
Less: valuation allowance	(120,230		)		(148,753		)
Net deferred tax assets	$	—			$	—

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- References

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- Definition

Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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- Definition

Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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