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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Cash flows from operating activities: |  |  |
Net loss | $ (32,451,000) | $ (27,494,000) | $ (23,216,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 855,000 | 931,000 | 1,681,000
Amortization of deferred financing costs and debt discount | 711,000 | 703,000 | 709,000
Warranty provision (reversal) | 0 | 0 | (23,000)
Increase (reduction) in allowance for doubtful accounts | 483,000 | 460,000 | 663,000
Change in fair value of warrants | (4,360,000) | (1,285,000) | 4,574,000
Change in fair value of option liability | 740,000 | 30,000 | (920,000)
Stock-based compensation | 3,316,000 | 3,055,000 | 2,649,000
Equity loss from investment in joint venture | 209,000 | 151,000 | 44,000
Increases (decreases) in cash caused by changes in operating assets and liabilities: |  |  |
Accounts receivable | (670,000) | (902,000) | (986,000)
Inventories | 60,000 | (777,000) | (446,000)
Other current assets | (3,000) | 36,000 | 41,000
Other assets | (1,206,000) | (110,000) | 75,000
Accounts payable and accrued expenses | (1,436,000) | 811,000 | 413,000
Deferred revenues, related party | (1,992,000) | (2,122,000) | (8,840,000)
Deferred revenues | 315,000 | 2,541,000 | (57,000)
Long-term deferred rent | 106,000 | 398,000 | (168,000)
Net cash used in operating activities | (35,323,000) | (23,574,000) | (23,807,000)
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (560,000) | (610,000) | (221,000)
Cash invested in restricted cash | 0 | (350,000) | 0
Investment in joint venture | 0 | (330,000) | 0
Net cash used in investing activities | (560,000) | (1,290,000) | (221,000)
Cash flows from financing activities: |  |  |
Principal payments on long-term obligations | (4,529,000) | (5,454,000) | (2,053,000)
Proceeds from long-term obligations | 9,444,000 | 20,000,000 | 0
Debt issuance costs and loan fees | (719,000) | (559,000) | 0
Proceeds from exercise of employee stock options and warrants | 2,849,000 | 7,128,000 | 531,000
Proceeds from sale of common stock | 13,286,000 | 45,486,000 | 23,196,000
Costs from sale of common stock | (194,000) | (1,923,000) | (1,336,000)
Proceeds from sale of treasury stock | 0 | 0 | 3,933,000
Net cash provided by financing activities | 20,137,000 | 64,678,000 | 24,271,000
Net (decrease) increase in cash and cash equivalents | (15,746,000) | 39,814,000 | 243,000
Cash and cash equivalents at beginning of year | 52,668,000 | 12,854,000 | 12,611,000
Cash and cash equivalents at end of year | 36,922,000 | 52,668,000 | 12,854,000
Cash paid during period for: |  |  |
Interest | 2,031,000 | 1,226,000 | 739,000
Final payment fee on long-term debt | 419,000 | 205,000 | 0
Supplemental schedule of non-cash investing and financing activities: |  |  |
Fair value of warrants allocated to additional paid-in capital | 267,000 | 279,000 | 0
Additions to fixed assets included in accounts payable and accrued expenses |  | 481,000 | 0
Capital equipment lease | $ 79,000 | $ 0 | $ 0

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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