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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Operating activities |  |  |
Net loss | $ (225) |  | $ (10,252)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 325 |  | 167
Stock-based compensation | 946 |  | 713
Changes in revaluation of warrant liability | (9,034) |  | 5,073
Non-cash interest expense | 0 |  | 4
Deferred income taxes | 6 |  | 7
Loss on disposal of fixed assets | 0 |  | 56
Changes in operating assets and liabilities, net of effects of acquired business: |  |  |
Accounts receivable | 1,182 |  | (289)
Inventories | 1,117 |  | (1,624)
Other assets | (764) |  | 910
Accounts payable | (2,181) |  | (3,299)
Accrued liabilities | (1,295) |  | 85
Deferred revenue | 98 |  | 97
Net cash used in operating activities | (9,825) |  | (8,352)
Investing activities |  |  |
Capital expenditures | (839) |  | (26)
Purchases of investments and certain other assets | (460) |  | 0
Maturities of investments | 4,300 |  | 0
Net cash provided by (used in) investing activities | 3,001 |  | (26)
Financing activities |  |  |
Net proceeds from equity incentive plans | 1,425 |  | 152
Net proceeds from public offering | 31 |  | 51,502
Proceeds from revolving line of credit | 0 |  | 526
Payments on debt, revolving line of credit and landlord provided leasehold incentives | (125) |  | (1,335)
Net cash provided by financing activities | 1,331 |  | 50,845
Net increase in cash and cash equivalents | (5,493) |  | 42,467
Cash and cash equivalents, beginning of period | 29,485 | [1] | 26,696
Cash and cash equivalents, end of period | $ 23,992 |  | $ 69,163
[1] | The financial information in this column was derived from audited financial statements included in the Company's 2013 Annual Report on Form 10-K.

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