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Consolidated Statements of Cash Flows (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash flows from operating activities: |  |  |
Net loss | $ (22,677,000) | $ (19,574,000) | $ (16,837,000)
Adjustments to reconcile net loss to net cash used for operating activities: |  |  |
Depreciation | 254,000 | 350,000 | 365,000
Amortization of deferred loan costs | 223,000 | 108,000 | 72,000
Amortization of debt discount | 1,352,000 | 3,123,000 | 2,372,000
Interest expense added to loan principal | 6,069,000 | 3,589,000 | 3,261,000
Loss on early extinguishment of debt and debt refinancing | 835,000 |  |
Unrealized gain on derivative liability |  |  | (108,000)
Compensation charge for stock awards and share options | 516,000 | 383,000 | 2,376,000
Changes in operating assets and liabilities: |  |  |
(Increase) decrease in accounts receivable | (31,000) | (121,000) | 138,000
Decrease (increase) in prepaid expenses and other | 54,000 | 200,000 | (305,000)
(Increase) decrease in other assets | (2,744,000) | (109,000) | 63,000
Increase in accounts payable | 43,000 | 128,000 | 304,000
Increase in accrued liabilities | 339,000 | 273,000 | 285,000
Increase in deferred revenue |  | 250,000 | 500,000
Net cash used for operating activities | (15,767,000) | (11,400,000) | (7,514,000)
Cash flows from investing activities: |  |  |
Additions to property, plant and equipment | (167,000) | (3,226,000) | (4,140,000)
Increase in other Assets (restricted cash) |  | (63,000) |
Net cash used for investing activities | (167,000) | (3,289,000) | (4,140,000)
Cash flows from financing activities: |  |  |
Net proceeds from issuance of common stock |  |  | 15,129,000
Net proceeds from issuance of long-term debt | 27,390,000 | 5,014,000 | 2,000,000
Debt issuance costs | (1,243,000) |  |
Principal payments on long-term debt | (11,000) | (10,000) | (16,000)
Net cash provided by financing activities | 26,136,000 | 5,004,000 | 17,113,000
Net increase (decrease) in cash and cash equivalents | 10,202,000 | (9,685,000) | 5,459,000
Cash and cash equivalents, beginning of period | 1,685,000 | 11,370,000 | 5,911,000
Cash and cash equivalents, end of period | $ 11,887,000 | $ 1,685,000 | $ 11,370,000

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