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Property and Equipment | 6 Months Ended
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Jun. 30, 2016
Property, Plant and Equipment [Abstract] |
Property and Equipment | PROPERTY AND EQUIPMENT Property and equipment are stated at cost and depreciated using the straight-line method over the estimated useful lives of the related assets and consist of the following (in thousands):
| June 30, 2016 |  | December 31, 2015
Equipment (useful life 3 to 15 years) | $ | 3,388 |  |  | $ | 2,864 |
Tooling (useful life 2 to 5 years) | 802 |  |  | 851 |
Vehicles (useful life 5 years) | 78 |  |  | 39 |
Furniture and fixtures (useful life 5 years) | 170 |  |  | 104 |
Computer software (useful life 3 years) | 707 |  |  | 581 |
Leasehold improvements (the shorter of useful life or lease life) | 534 |  |  | 509 |
Construction in progress | 519 |  |  | 310 |
Property and equipment at cost | 6,198 |  |  | 5,258 |
Less: accumulated depreciation | (3,059 | ) |  | (2,829 | )
Property and equipment, net | $ | 3,139 |  |  | $ | 2,429 |
Depreciation expense was $185 thousand and $52 thousand for the three months ended June 30, 2016 and 2015, respectively. For the six months ended June 30, 2016 and 2015, depreciation expense was $336 thousand and $101 thousand, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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