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Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Cash flows from operating activities: |  |
Net loss | $ (26,396) | $ (17,014)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Depreciation and amortization | 4,041 | 4,544
Provision for bad debts, net of recoveries | 109 | 382
Provision for excess and obsolete inventory | 3,033 | 1,823
Share-based compensation expense | 1,239 | 1,889
Non-cash income tax benefit | 0 | (48)
Changes in assets and liabilities: |  |
Accounts receivable | 14,241 | 2,689
Inventories | (1,262) | 8,296
Prepaid expenses and other assets | 2,170 | (608)
Accounts payable | 2,487 | 4,322
Accrued expenses, income taxes, and other | 1,375 | 226
Net cash provided by operating activities | 1,037 | 6,501
Cash flows from investing activities: |  |
Purchases of property and equipment | (1,241) | (3,725)
Purchases of marketable securities | (826) | (9,661)
Marketable securities maturities / sales | 9,945 | 14,516
Net cash provided by investing activities | 7,878 | 1,130
Cash flows from financing activities: |  |
Proceeds from the issuance of short-term debt, net of issuance costs | 0 | 10,000
Principal repayments of short-term debt | (2,566) | (8,444)
Taxes paid on vested restricted stock units, net of proceeds from stock option exercises | (284) | (261)
Net cash provided by (used in) financing activities | (2,850) | 1,295
Effect of exchange rates on cash and cash equivalents | (51) | (107)
Net increase in cash and cash equivalents | 6,014 | 8,819
Cash and cash equivalents, beginning of period | 2,911 | 16,044
Cash and cash equivalents, end of period | 8,925 | 24,863
Cash paid during the year for: |  |
Interest | 6 | 4
Income taxes | $ 67 | $ 60

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