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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |
Net loss | $ (19,574) | $ (16,837) | $ (15,899)
Adjustments to reconcile net loss to net cash |  |  |
Depreciation | 350 | 365 | 344
Amortization of deferred loan costs | 108 | 72 | 42
Amortization of debt discount | 3,123 | 2,372 | 1,918
Interest added to loan principal | 3,589 | 3,261 | 2,782
Unrealized (gain) loss on derivative liability |  | (108) | 110
Compensation charge for stock awards and share options | 383 | 2,376 | 4,009
Changes in operating assets and liabilities: |  |  |
(Increase) decrease in accounts receivable | (121) | 138 | (102)
Decrease (increase) in prepaid expenses and other | 200 | (305) | 63
(Increase) decrease in other assets | (109) | 63 | 220
Increase (decrease) in accounts payable | 128 | 304 | (141)
Increase (decrease) in accrued liabilities | 273 | 285 | (107)
Increase in deferred revenue | 250 | 500 |
Net cash used for operating activities | (11,400) | (7,514) | (6,761)
Cash flows from investing activities: |  |  |
Additions to property, plant and equipment | (3,226) | (4,140) | (1,184)
Other Assets (restricted cash) | (63) |  |
Net cash used for investing activities | (3,289) | (4,140) | (1,184)
Cash flows from financing activities: |  |  |
Net proceeds from issuance of common stock |  | 15,129 |
Proceeds from issuance of long-term debt | 5,014 | 2,000 | 5,000
Principal payments on long-term debt | (10) | (16) | (22)
Net cash provided by financing activities | 5,004 | 17,113 | 4,978
Net increase (decrease) in cash and cash equivalents | (9,685) | 5,459 | (2,967)
Cash and cash equivalents, beginning of period | 11,370 | 5,911 | 8,878
Cash and cash equivalents, end of period | $ 1,685 | $ 11,370 | $ 5,911

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