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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Cash flows from operating activities: |  |
Net loss | $ (14,436) | $ (25,533)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock option compensation expense | 321 | 407
Restricted stock compensation expense | 96 | 179
Depreciation expense | 742 | 866
Provision for inventory obsolescence | 118 | 17
Warrant liability fair value adjustment | (1,612) | (2,345)
Loss on write-downs and disposals of equipment | 147 | 5
Non-cash interest income | 0 | (1)
Changes in assets and liabilities: |  |
Decrease in prepaid expenses and other current assets | 937 | 305
Decrease in accounts receivable | 187 | 36
Decrease in inventories | 73 | 133
Increase (decrease) in accounts payable and accrued expenses | 275 | (3,149)
Increase in other non-current liabilities | 723 | 189
Net cash used in operating activities | (12,429) | (28,891)
Cash flows from investing activities: |  |
Purchase of property, plant and equipment | 0 | (113)
Proceeds from sales of property, plant and equipment | 37 | 0
Net cash provided by (used in) investing activities | 37 | (113)
Cash flows from financing activities: |  |
Net proceeds from sale of stock and exercise of warrants | 4,489 | 32,218
Net cash provided by financing activities | 4,489 | 32,218
Foreign currency effects on cash | (23) | 795
Net (decrease) increase in cash and cash equivalents | (7,926) | 4,009
Cash and cash equivalents: |  |
Beginning of period | 31,249 | 23,726
End of period | 23,323 | 27,735
Supplemental non-cash activities: |  |
Fair value of warrants exercised | $ 143 | $ 219

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