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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Taxes

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

​

​	​	​	​	​	​	​	​	​	​
​	​	Year ended December 31,
​		2020			2019			2018
​	​	(in thousands)
Domestic	​	$	(10,292)	​	$	(78,486)	​	$	(286,561)
Foreign	​		1,828	​		530	​		(147,273)
Total	​	$	(8,464)	​	$	(77,956)	​	$	(433,834)

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

​

​	​	​	​	​	​	​	​	​	​
​	​	Year ended December 31,
​		2020			2019			2018
​	​	(in thousands)
Current:	​	​	​	​	​	​	​	​	​
Federal	​	$	—	​	$	—	​	$	(1,682)
Foreign	​		22	​		304	​		2,518
State and local	​		204	​		113	​		38
Total current expense (benefit) for income taxes	​		226	​		417	​		874
Deferred:	​	​	​	​	​	​	​	​	​
Federal	​		136	​		162	​		205
Foreign	​		(320)	​		116	​		(27,932)
State and local	​		(115)	​		82	​		107
Total deferred expense (benefit) for income taxes	​		(299)	​		360	​		(27,620)
Total expense (benefit) for income taxes	​	$	(73)	​	$	777	​	$	(26,746)

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

​

​	​	​	​	​	​	​	​	​	​
​	​	Year ended December 31,
​		2020			2019			2018
​	​	(in thousands)
Income tax expense (benefit) at U.S. statutory rates	​	$	(1,777)	​	$	(16,396)	​	$	(91,105)
State taxes, net of U.S. federal impact	​		(121)	​		(835)	​		(2,848)
Effect of international operations	​		(131)	​		785	​		11,847
Research and development tax credit	​		726	​		(1,692)	​		(2,230)
Net change in valuation allowance	​		388	​		15,098	​		7,747
Change in accrual for unrecognized tax benefits	​		(6)	​		1,232	​		2,868
Share-based compensation	​	​	2,248	​	​	1,947	​	​	1,848
Effect of 2017 Tax Act	​	​	—	​	​	—	​	​	(1,690)
Asset impairment	​	​	728	​	​	495	​	​	46,872
Partial extinguishment of 2023 Notes	​	​	(2,292)	​	​	—	​	​	—
Other	​		164	​		143	​		(55)
Total expense (benefit) for income taxes	​	$	(73)	​	$	777	​	$	(26,746)

Schedule of deferred tax assets and liabilities

​

​	​	​	​	​	​	​
​	​	December 31,
​		2020			2019
​	​	(in thousands)
Deferred tax assets:	​	​	​	​	​	​
Inventory valuation		$	10,949	​	$	11,170
Net operating losses	​	​	51,260	​		63,342
Credit carry forwards	​	​	54,160	​	​	55,103
Warranty and installation accruals	​	​	1,045	​		1,391
Share-based compensation	​	​	4,587	​		6,296
Customer deposits and deferred revenue	​	​	10,982	​	​	5,986
Operating leases	​	​	2,281	​	​	3,181
Other	​	​	4,741	​		3,501
Total deferred tax assets	​	​	140,005	​		149,970
Valuation allowance	​	​	(118,443)	​		(130,053)
Net deferred tax assets	​	​	21,562	​		19,917
​	​	​	​	​	​	​
Deferred tax liabilities:	​	​	​	​	​	​
Purchased intangible assets	​	​	7,227	​		9,345
Convertible Senior Notes	​	​	13,674	​	​	8,831
Operating leases	​	​	2,241	​	​	3,172
Depreciation	​	​	2,220	​		2,668
Total deferred tax liabilities	​	​	25,362	​		24,016
Net deferred taxes		$	(3,800)	​	$	(4,099)

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

​

​	​	​	​	​	​	​	​	​	​
​	​	December 31,
​		2020			2019			2018
​	​	(in thousands)
Balance at beginning of year	​	$	12,369	​	$	11,137	​	$	8,269
Additions for tax positions related to current year	​		1,217	​		3,075	​		2,154
Additions for tax positions related to prior years	​		47	​		21	​		1,721
Reductions for tax positions related to prior years	​		(1,166)	​		(1,814)	​		(934)
Reductions due to the lapse of the statute of limitations	​		—	​		—	​		(26)
Settlements	​		(104)	​		(50)	​		(47)
Balance at end of year	​	$	12,363	​	$	12,369	​	$	11,137

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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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.

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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.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months.

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