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Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Cash flows from operating activities: |  |
Net income (loss) | $ (1,068) | $ 3,512
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |
Provision for doubtful accounts | 74 | 338
Depreciation and amortization | 3,410 | 2,669
Deferred income taxes | (227) | 103
Loss on derivative instruments | 17 | 73
Compensation expense related to stock-based awards and employee stock purchase plan | 1,902 | 2,004
Changes in operating assets and liabilities: |  |
Accounts receivable | (3,251) | 2,586
Inventories | (1,865) | (1,164)
Prepaid expenses and other assets | (120) | (986)
Other non-current assets | 167 | (631)
Accounts payable | (1,295) | (481)
Deferred revenue | 2,179 | 2,503
Accrued expenses | 1,250 | 71
Other long-term liabilities | 92 | 1,173
Net cash provided by operating activities | 1,265 | 11,770
Cash flows from investing activities: |  |
Capital expenditures | (1,851) | (1,444)
Net cash paid for business acquired | 0 | 22,774
Purchases of marketable securities | (9,287) | (27,055)
Maturities and sales of marketable securities | 14,721 | 12,089
Net cash provided by (used in) investing activities | 3,583 | (39,184)
Cash flows from financing activities: |  |
Repayments of long-term debt | (631) | (443)
Borrowings from long-term debt | 0 | 4,671
Proceeds from stock options exercised and employee stock purchase plan | 375 | 1,954
Payment of employee restricted stock withholdings | (482) | (828)
Proceeds from Long-term Lines of Credit | 0 | 23,000
Net cash (used in) provided by financing activities | (738) | 28,354
Effect of exchange rate changes on cash and cash equivalents | (107) | (2)
Net increase in cash and cash equivalents | 4,003 | 938
Cash and cash equivalents at beginning of period | 9,358 | 8,978
Cash and cash equivalents at end of period | $ 13,361 | $ 9,916

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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
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration