Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Taxes

Schedule of income (loss) from continuing operations before income taxes

	Year ended December 31,
	2019		2018		2017
	(in thousands)
Domestic	$	(78,486)	$	(286,561)	$	(101,573)
Foreign		530		(147,273)		12,583
Total	$	(77,956)	$	(433,834)	$	(88,990)

Schedule of components of the expense (benefit) for income taxes

	Year ended December 31,
	2019		2018		2017
	(in thousands)
Current:
Federal	$	—	$	(1,682)	$	—
Foreign		304		2,518		(2,246)
State and local		113		38		15
Total current expense (benefit) for income taxes		417		874		(2,231)
Deferred:
Federal		162		205		(35,912)
Foreign		116		(27,932)		1,291
State and local		82		107		(742)
Total deferred expense (benefit) for income taxes		360		(27,620)		(35,363)
Total expense (benefit) for income taxes	$	777	$	(26,746)	$	(37,594)

Schedule of reconciliation of the income tax expense computed using the Federal statutory rate to actual income tax provision

	Year ended December 31,
	2019		2018		2017
	(in thousands)
Income tax expense (benefit) at U.S. statutory rates	$	(16,396)	$	(91,105)	$	(31,147)
State taxes, net of U.S. federal impact		(835)		(2,848)		(2,523)
Effect of international operations		785		11,847		10,158
Research and development tax credit		(1,692)		(2,230)		620
Net change in valuation allowance		15,098		7,747		1,883
Change in accrual for unrecognized tax benefits		1,232		2,868		(4,772)
Share-based compensation		1,947		1,848		99
Effect of 2017 Tax Act		—		(1,690)		(11,344)
Asset impairment		495		46,872		—
Other		143		(55)		(568)
Total expense (benefit) for income taxes	$	777	$	(26,746)	$	(37,594)

Schedule of deferred tax assets and liabilities

	December 31,
	2019		2018
	(in thousands)
Deferred tax assets:
Inventory valuation	$	11,170	$	8,943
Net operating losses		63,342		67,787
Credit carry forwards		55,103		52,592
Warranty and installation accruals		1,391		1,695
Share-based compensation		6,296		6,981
Other		9,496		2,182
Total deferred tax assets		146,798		140,180
Valuation allowance		(130,053)		(114,955)
Net deferred tax assets		16,745		25,225
Deferred tax liabilities:
Purchased intangible assets		9,345		15,401
Convertible Senior Notes		8,831		11,265
Depreciation		2,668		2,380
Total deferred tax liabilities		20,844		29,046
Net deferred taxes	$	(4,099)	$	(3,821)

Schedule of reconciliation of beginning and ending amount of uncertain tax positions

	December 31,
	2019		2018		2017
	(in thousands)
Balance at beginning of year	$	11,137	$	8,269	$	7,452
Additions for tax positions related to current year		3,075		2,154		511
Additions for tax positions related to prior years		21		1,721		3
Reductions for tax positions related to prior years		(1,814)		(934)		(4,877)
Reductions due to the lapse of the statute of limitations		—		(26)		(122)
Settlements		(50)		(47)		(287)
Additions for business combination		—		—		5,589
Balance at end of year	$	12,369	$	11,137	$	8,269