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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