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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Significant Accounting Policies [Abstract] |
Inventories | Inventories consist of the following (U.S. dollars in thousands):
|  | December 31, |
|  | 2016 |  |  | 2017 |
Raw materials |  | $ | 108,276 |  |  | $ | 87,683 |
Finished goods |  |  | 141,660 |  |  |  | 165,771 |
|  | $ | 249,936 |  |  | $ | 253,454 |
Inventory Reserves | Reserves of inventories consist of the following (U.S. dollars in thousands):
|  | 2015 |  |  | 2016 |  |  | 2017 |
Beginning balance |  | $ | 56,034 |  |  | $ | 20,744 |  |  | $ | 7,995 |
Additions |  |  | 38,605 |  |  |  | 24,906 |  |  |  | 16,382 |
Write-offs |  |  | (73,895 | ) |  |  | (37,655 | ) |  |  | (16,296 | )
Ending balance |  | $ | 20,744 |  |  | $ | 7,995 |  |  | $ | 8,081 |
Estimated Useful Lives | Depreciation is recorded using the straight-line method over the following estimated useful lives:
| Buildings |  | 39 years |
| Furniture and fixtures |  | 5 - 7 years |
| Computers and equipment |  | 3 -- 5 years |
| Leasehold improvements |  | Shorter of estimated useful life or lease term |
| Scanners |  | 3 years |
| Vehicles |  | 3 - 5 years |
Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits included in other liabilities is as follows (U.S. dollars in thousands):
|  | 2015 |  |  | 2016 |  |  | 2017 |
Gross balance at January 1 |  | $ | 5,987 |  |  | $ | 7,772 |  |  | $ | 5,290 |
Increases related to prior year tax positions |  |  | 1,677 |  |  |  | 185 |  |  | ─ |
Decreases related to prior year tax positions |  | ─ |  |  | ─ |  |  |  | (277 | )
Increases related to current year tax positions |  |  | 1,119 |  |  |  | 918 |  |  |  | 669 |
Settlements |  | ─ |  |  |  | (3,369 | ) |  |  | (159 | )
Decreases due to lapse of statutes of limitations |  |  | (667 | ) |  |  | (252 | ) |  |  | (187 | )
Currency adjustments |  |  | (344 | ) |  |  | 36 |  |  |  | 178 |
Gross balance at December 31 |  | $ | 7,772 |  |  | $ | 5,290 |  |  | $ | 5,514 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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