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Income Taxes (Tables) | 12 Months Ended
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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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