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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Statement of Cash Flows [Abstract] |  |
Net loss | $ (13,178) | $ (22,693)
Adjustments to reconcile net loss to net cash used in operations: |  |
Depreciation | 923 | 1,445
Amortization of intangible assets | 158 | 184
Impairment of intangible assets | 277 | 284
Gain on disposal of property and equipment | (35) | (79)
Realizeld loss on sale of short-term investments | 0 | 32
Non-cash stock-based compensation expense | 1,606 | 2,269
Change in warrant liability | (1,801) | 0
Realized gain on warrant exchange | (99) | 0
Inventory write-downs | 303 | 1,094
Non-cash deferred rent | (31) | (118)
Change in: |  |
Accounts receivable, net | 1,091 | (652)
Costs and estimated earnings in excess of billings on uncompleted contracts | 12 | 58
Inventory | 145 | 2,663
Other current assets | 868 | (419)
Other assets | 4 | 12
Accounts payable | (1,486) | (4,077)
Accrued liabilities | (1,387) | (1,175)
Deferred revenue | (609) | 609
Billings in excess of costs and estimated earnings on uncompleted contracts | 582 | (58)
Net cash used in operating activities | (12,657) | (20,621)
Cash flows from investing activities |  |
Sales of investment securities | 0 | 11
Decrease in restricted cash | 1 | 350
Proceeds on sale of property and equipment | 35 | 80
Purchases of property and equipment | (376) | (533)
Net cash used in investing activities | (340) | (92)
Cash flows from financing activities |  |
Principal payments under capital leases and long-term debt | (120) | (136)
Net proceeds from issuance of common stock and warrants | 11,642 | 14,624
Net cash provided by financing activities | 11,522 | 14,488
Net decrease in cash and cash equivalents | (1,475) | (6,225)
Cash and cash equivalents, at beginning of period | 6,850 | 13,075
Cash and cash equivalents, at end of period | 5,375 | 6,850
Supplemental disclosure of cash flow information |  |
Cash paid for interest | 12 | 30
Supplemental schedule of non-cash investing and financing activities |  |
Other non-cash additions to property and equipment | 407 | 0
Issuance of common stock for exchange of warrants | $ 536 | $ 0

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