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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 | $ (14,542) | $ (18,120) | $ (13,178)
Adjustments to reconcile net loss to net cash used in operations: |  |  |
Depreciation | 429 | 414 | 923
Amortization of intangible assets | 128 | 132 | 158
Impairment of intangible assets | 0 | 40 | 277
Non-cash share-based compensation expense | 1,007 | 713 | 1,606
(Gain) loss on warrant exchange | 0 | 4,967 | (1,900)
Inventory write-downs | 287 | 42 | 303
Other non-cash adjustments | (62) | (91) | (66)
Change in: |  |  |
Accounts receivable, net | (1,018) | (645) | 1,091
Inventory | (1,033) | (109) | 145
Other current and non-current assets | (147) | (155) | 884
Accounts payable | 493 | (25) | (1,486)
Accrued liabilities | 590 | 335 | (1,387)
Deferred revenue | 8,271 | 0 | (609)
Billings on uncompleted contracts in excess of related costs | (230) | (450) | 582
Net cash used in operating activities | (5,827) | (12,952) | (12,657)
Cash flows from investing activities |  |  |
Proceeds on sale of property and equipment | 0 | 34 | 35
Purchases of property and equipment | (1,140) | (207) | (375)
Net cash used in investing activities | (1,140) | (173) | (340)
Cash flows from financing activities |  |  |
Principal payments under capital leases and long-term debt | 0 | (15) | (120)
Net proceeds from issuance of common stock and warrants | 6,506 | 16,114 | 11,642
Net cash provided by financing activities | 6,506 | 16,099 | 11,522
Net increase (decrease) in cash and cash equivalents | (461) | 2,974 | (1,475)
Cash and cash equivalents, at beginning of period | 8,349 | 5,375 | 6,850
Cash and cash equivalents, at end of period | 7,888 | 8,349 | 5,375
Supplemental disclosure of cash flow information |  |  |
Cash paid for interest | 2 | 3 | 12
Supplemental schedule of non-cash investing and financing activities |  |  |
Non-cash additions to property and equipment | 165 | 101 | 407
Issuance of common stock for exchange of warrants | $ 0 | $ 9,869 | $ 536

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