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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Cash flows from operating activities: |  |  |
Net loss | $ (16,837) | $ (15,899) | $ (14,399)
Adjustments to reconcile net loss to net cash used for operating activities: |  |  |
Depreciation | 365 | 344 | 342
Amortization of deferred loan costs | 72 | 42 | 56
Amortization of debt discount | 2,372 | 1,918 | 1,937
Interest added to loan principal | 3,261 | 2,782 | 2,356
Unrealized (gain) loss on derivative liability | (108) | 110 |
Compensation charge for stock awards and share options | 2,376 | 4,009 | 2,273
Issuance of stock for services |  |  | 500
Changes in operating assets and liabilities: |  |  |
Decrease (increase) in accounts receivable | 138 | (102) | (109)
(Increase) decrease in prepaid expenses and other | (305) | 63 | 145
Decrease in other assets | 63 | 220 | 194
Increase (decrease) in accounts payable | 304 | (141) | 252
Increase (decrease) in accrued liabilities | 285 | (107) | (30)
Increase in tax liability |  |  | 105
Increase in deferred revenue | 500 |  |
Net cash used for operating activities | (7,514) | (6,761) | (6,378)
Cash flows from investing activities: |  |  |
Additions to property, plant and equipment | (4,140) | (1,184) | (119)
Proceeds from sale of marketable securities |  |  | 4,500
Net cash (used for) provided by investing activities | (4,140) | (1,184) | 4,381
Cash flows from financing activities: |  |  |
Net proceeds from issuance of common stock | 15,129 |  | 8,835
Proceeds from issuance of long-term debt | 2,000 | 5,000 | 46
Principal payments on long-term debt | (16) | (22) | (20)
Net cash provided by financing activities | 17,113 | 4,978 | 8,861
Net increase (decrease) in cash and cash equivalents | 5,459 | (2,967) | 6,864
Cash and cash equivalents, beginning of period | 5,911 | 8,878 | 2,014
Cash and cash equivalents, end of period | $ 11,370 | $ 5,911 | $ 8,878

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