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v3.3.1.900

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash flows from operating activities: |  |  |
Net loss | $ (14,704) | $ (17,381) | $ (30,324)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Stock option compensation expense | 349 | 391 | 174
Restricted stock compensation expense | 308 | 100 | 117
Depreciation expense | 617 | 958 | 1,126
Provision or inventory obsolescence | 0 | 118 | 0
Loss on disposal of equipment | 15 | 282 | 5
Warrant liability fair value adjustment | (564) | (1,942) | (2,756)
Non-cash interest income | (1) | 0 | (1)
Changes in assets and liabilities: |  |  |
(Increase) decrease in prepaid expenses and other assets | 9 | 718 | (235)
(Increase) decrease in accounts receivable | (52) | 161 | (211)
(Increase) decrease in inventories | (420) | 237 | 391
(Decrease) increase in accounts payable and accrued expenses | (1,757) | 132 | (2,445)
Increase (decrease) in other non-current liabilities | (220) | 674 | 57
Net cash used in operating activities | (16,420) | (15,552) | (34,102)
Cash flows from investing activities: |  |  |
Purchase of property, plant and equipment | (170) | (44) | (142)
Proceeds from sales of property, plant and equipment | 180 | 37 | 0
Net cash provided by (used in) investing activities | 10 | (7) | (142)
Cash flows from financing activities: |  |  |
Net proceeds from sale of stock and exercise of warrants | 8,655 | 4,869 | 41,702
Net cash provided by financing activities | 8,655 | 4,869 | 41,702
Foreign currency effects on cash and cash equivalents | (107) | (90) | 65
Net increase (decrease) in cash and cash equivalents | (7,862) | (10,780) | 7,523
Cash and cash equivalents: |  |  |
Beginning of period | 20,469 | 31,249 | 23,726
End of period | 12,607 | 20,469 | 31,249
Supplemental non-cash activities: |  |  |
Fair value of warrants issued | 4,247 | 0 | 1,857
Fair value of warrants exercised | $ 123 | $ 143 | $ 218

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