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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating activities |  |  |
Net loss | $ (15,917) | $ (16,982) | $ (16,911)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 744 | 922 | 853
Stock-based compensation | 2,541 | 1,850 | 1,828
Changes in revaluation of warrant liability | (2,059) | (486) | (39)
Gain on non-controlling equity interest | 0 | 0 | (315)
Non-cash interest expense | 20 | 5 | 152
Deferred income taxes | 62 | 0 | 0
Changes in operating assets and liabilities, net of effects of acquired business: |  |  |
Accounts receivable | 1,652 | (1,304) | (1,167)
Inventories | (3,740) | (601) | 2,066
Other assets | (1,663) | (13) | 99
Accounts payable | 2,506 | 1,450 | (1,193)
Accrued restructuring | 0 | 0 | (113)
Accrued liabilities | 1,971 | (336) | 569
Deferred revenue | (34) | (137) | (97)
Net cash used in operating activities | (13,917) | (15,632) | (14,268)
Investing activities |  |  |
Purchases of furniture, equipment and leasehold improvements | (81) | (158) | (1,692)
Sales (purchases) of certain other assets | (1) | 55 | (11)
Sales of investments | 0 | 0 | 88
Maturities of investments | 287 | 666 | 1,545
Net cash provided by (used in) investing activities | 205 | 563 | (70)
Financing activities |  |  |
Net proceeds from equity incentives and the exercise of warrants | 332 | 143 | 370
Net proceeds from public offering | 14,226 | 9,273 | 19,291
Proceeds from landlord provided leasehold incentives | 0 | 0 | 1,561
Proceeds from revolving line of credit | 1,810 | 2,300 | 0
Proceeds from debt, net of discount | 0 | 4,910 | 4,811
Payments on revolving line of credit | (920) | 0 | 0
Payments on debt and landlord provided leasehold incentives | (537) | (5,008) | (34)
Net cash provided by financing activities | 14,911 | 11,618 | 25,999
Net increase (decrease) in cash and cash equivalents | 1,199 | (3,451) | 11,661
Cash and cash equivalents, beginning of period | 25,497 | 28,948 | 17,287
Cash and cash equivalents, end of period | 26,696 | 25,497 | 28,948
Supplemental disclosures: |  |  |
Non-cash conversion of preferred stock to common stock | 9,496 | 0 | 0
Common stock issued in connection with the acquisition of certain assets of BioOne | 0 | 0 | 3,423
Cash paid for interest | 460 | 1,024 | 600
Cash paid for income taxes | $ 162 | $ 125 | $ 114

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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