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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Cash flows from operating activities: |  |
Net loss | $ (17,014) | $ (42,421)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |
Loss on sale/disposal of fixed asset | 18 | 28
Depreciation and amortization | 4,544 | 6,972
Impairment of goodwill and purchased intangible assets | 0 | 29,337
Provision for bad debts | 382 | 88
Net impairment loss on marketable securities | 0 | 39
Inventory provision | 1,823 | 316
Share-based compensation expense | 1,889 | 3,657
Non-cash income tax expense (benefit) | (48) | 97
Changes in assets and liabilities: |  |
Accounts receivable | 2,689 | (11,271)
Inventories | 8,296 | 2,398
Prepaid expenses and other assets | (608) | (2,250)
Accounts payable | 4,322 | (10,869)
Accrued expenses, income taxes, and other | 208 | 425
Net cash provided by (used in) operating activities | 6,501 | (23,454)
Cash flows from investing activities: |  |
Purchases of property and equipment | (3,725) | (3,588)
Purchases of marketable securities | (9,661) | (17,530)
Marketable securities maturities / sales | 14,516 | 12,059
Net cash provided by (used in) investing activities | 1,130 | (9,059)
Cash flows from financing activities: |  |
Proceeds from the issuance of short-term debt | 10,000 | 0
Principal repayments of short-term debt | (8,444) | 0
Principal payments under capital lease obligations | 0 | (46)
Proceeds from stock option exercises and ESPP net of taxes paid on vested restricted stock units | (261) | 734
Net cash provided by financing activities | 1,295 | 688
Effect of exchange rates on cash and cash equivalents | (107) | (47)
Net increase (decrease) in cash and cash equivalents | 8,819 | (31,872)
Cash and cash equivalents, beginning of period | 16,044 | 47,069
Cash and cash equivalents, end of period | 24,863 | 15,197
Cash paid during the year for: |  |
Interest | 4 | 1
Income taxes | $ 60 | $ 39

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + 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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