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Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Cash flows from operating activities: |  |
Net loss | $ (35,228) | $ (22,107)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Depreciation and amortization | 5,889 | 6,774
Provision for bad debts, net of recoveries | 187 | 1,005
Provision for excess and obsolete inventory | 3,033 | 3,069
Share-based compensation expense | 1,616 | 2,848
Change in fair value of warrant liability | 4,788 | 0
Non-cash income tax benefit | 0 | 266
Changes in assets and liabilities: |  |
Accounts receivable | 11,600 | (5,895)
Inventories | (3,379) | 8,922
Prepaid expenses and other assets | 1,300 | (2,169)
Accounts payable | 5,500 | 2,832
Accrued expenses, income taxes, and other | (4,790) | 273
Net cash used in operating activities | (9,484) | (4,182)
Cash flows from investing activities: |  |
Purchases of property and equipment | (1,513) | (5,048)
Purchases of intangible assets | (143) | 0
Purchases of marketable securities | (1,255) | (22,238)
Marketable securities maturities / sales | 18,513 | 31,731
Net cash provided by investing activities | 15,602 | 4,445
Cash flows from financing activities: |  |
Proceeds from the issuances of Series C preferred and common stock, net of issuance costs | 14,163 | 0
Proceeds from the issuance of short-term debt, net of issuance costs | 0 | 13,400
Principal repayments of short-term debt | (2,566) | (10,969)
Taxes paid on vested restricted stock units net of proceeds from stock option exercises and ESPP | (375) | (515)
Net cash provided by financing activities | 11,222 | 1,916
Effect of exchange rates on cash and cash equivalents | (88) | (85)
Net increase in cash and cash equivalents | 17,252 | 2,094
Cash and cash equivalents, beginning of period | 2,911 | 16,044
Cash and cash equivalents, end of period | 20,163 | 18,138
Cash paid during the year for: |  |
Interest | 80 | 31
Income taxes | 83 | 59
Supplemental disclosures of non-cash investing activities: |  |
Building rent incentives to fund leasehold improvements | 0 | 359
Supplemental disclosures of non-cash financing activities: |  |
Issuance of common stock for settlement of shareholder litigation | 5,000 | 0
Initial fair value of warrant liability recorded upon issuance of Series C preferred and common stock | 4,939 | 0
Change in fair value of warrant liability | $ 4,788 | $ 0

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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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- Definition The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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