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Other Financial Statement Information (Tables) | 3 Months Ended
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Mar. 31, 2013
Allowance for doubtful receivables | The following tables provide details of selected financial statement items: ALLOWANCE FOR DOUBTFUL RECEIVABLES
| Three Months Ended | Year Ended
| March 31, 2013 | December 31, 2012
Balance at beginning of year | $ 49 | $ 50
Provision for doubtful receivables | 15 | -
Write-offs | - | (1 )
Balance at end of year | $ 64 | $ 49
Inventories | INVENTORIES
| March 31, | December 31,
| 2013 | 2012
Finished goods | $ 61 | $ 103
Work-in-process | 46 | 55
Total inventories | $ 107 | $ 158
Property and equipment | PROPERTY AND EQUIPMENT
| March 31, | December 31,
| 2013 | 2012
Leased equipment | $ 89 | $ 89
Equipment | 1,202 | 1,192
Leasehold improvements | 381 | 381
Demonstration equipment | 5 | 5
Purchased software | 368 | 373
Furniture and fixtures | 570 | 572
Total property and equipment | $ 2,615 | $ 2,612
Less: accumulated depreciation and amortization | (2,243 ) | (2,197 )
Net property and equipment | $ 372 | $ 415
Deferred revenue | DEFERRED REVENUE
| March 31, | December 31,
| 2013 | 2012
Deferred software maintenance | $ 467 | $ 480
Customer deposits and deferred project revenue | 201 | 116
Total deferred revenue | $ 668 | $ 596
Accrued liabilities | ACCRUED LIABILITIES
| March 31, | December 31,
| 2013 | 2012
Compensation | $ 349 | $ 254
Accrued rent | 201 | 208
Sales tax and other | 57 | 65
Total accrued liabilities | $ 607 | $ 527
Supplemental cash flow information | SUPPLEMENTAL CASH FLOW INFORMATION
| Three Months Ended
| March 31,
| 2013 | 2012
Cash paid for: |  |
Interest | $ 7 | $ 2

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- Definition Tabular disclosure of the type of arrangements and the corresponding amounts that comprise the current and noncurrent balance of deferred revenue as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=6600647&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6935-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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- Definition Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + 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 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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