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Property and Equipment, net | 12 Months Ended
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Dec. 31, 2014
Property and Equipment, net | Note 6. Property and Equipment, net Property and equipment, net at December 31, 2014 and 2013, consisted of the following (in thousands):
|  | December 31, |
|  | 2014 |  |  | 2013 |
Leasehold improvements |  | $ | 5,638 |  |  | $ | 5,628 |
Machinery and equipment |  |  | 1,351 |  |  |  | 1,751 |
Demonstration equipment |  |  | 123 |  |  |  | 100 |
Office furniture |  |  | 783 |  |  |  | 763 |
Computer equipment |  |  | 663 |  |  |  | 651 |
Computer software |  |  | 2,913 |  |  |  | 1,083 |
Consigned demonstration equipment |  |  | 980 |  |  |  | 642 |
Construction-in-progress |  |  | 150 |  |  |  | 155 |
Total property and equipment, gross |  |  | 12,601 |  |  |  | 10,773 |
Accumulated depreciation and amortization |  |  | (8,820 | ) |  |  | (8,584 | )
Total property and equipment, net |  | $ | 3,781 |  |  | $ | 2,189 |
Depreciation and amortization expense related to property and equipment, net was $0.7 million, $0.4 million and $0.4 million for the years ended December 31, 2014, 2013 and 2012, 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 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: 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=6391110&loc=d3e2921-110230 Reference 3: 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=6360339&loc=d3e1361-107760 Reference 4: 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 + Details
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