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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Cash flows from operating activities: |  |
Net loss | $ (9,878) | $ (18,328)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock option compensation expense | 257 | 571
Restricted stock compensation expense | 60 | 241
Depreciation expense | 499 | 604
Provision for inventory obsolescence | 102 | 17
Warrant liability fair value adjustment | (1,092) | (2,842)
Loss on write-downs and disposals of equipment | 123 | 5
Non-cash interest income | 0 | 1
Changes in assets and liabilities: |  |
Decrease (increase) in prepaid expenses and other current assets | 856 | (132)
Decrease in accounts receivable | 183 | 84
Decrease in inventories | 15 | 157
Increase (decrease) in accounts payable and accrued expenses | 7 | (1,576)
Increase (decrease) in other non-current liabilities | 383 | (300)
Net cash used in operating activities | (8,485) | (21,498)
Cash flows from investing activities: |  |
Purchase of property, plant, and equipment | 0 | (79)
Proceeds from sales of property, plant, and equipment | 22 | 0
Net cash provided by (used in) investing activities | 22 | (79)
Cash flows from financing activities: |  |
Net proceeds from sale of stock and exercise of stock options and warrants | 4,521 | 29,975
Net cash provided by financing activities | 4,521 | 29,975
Foreign currency effects on cash | (23) | 202
Net (decrease) increase in cash and cash equivalents | (3,965) | 8,600
Cash and cash equivalents: |  |
Beginning of period | 31,249 | 23,726
End of period | 27,284 | 32,326
Supplemental non-cash activities: |  |
Fair value of warrants exercised | $ 143 | $ 219

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