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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net loss $ 1,963 $ (1,375)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Provision for doubtful accounts 72 0
Depreciation and amortization 1,224 1,115
Deferred income taxes 683 102
Loss on interest rate swaps 31 32
Compensation expense related to stock-based awards and employee stock purchase plan 1,082 1,017
Changes in operating assets and liabilities:    
Accounts receivable (1,825) 7,614
Inventories (721) 1,098
Prepaid expenses and other assets (813) (66)
Other non-current assets 227 152
Accounts payable (332) (1,044)
Deferred revenue 182 (1,610)
Accrued expenses (565) (1,962)
Other long-term liabilities 1,170 6
Net cash provided by (used in) operating activities 2,378 5,079
Cash flows from investing activities:    
Capital expenditures (790) (2,206)
Purchases of marketable securities (12,705) (19,440)
Maturities and sales of marketable securities 3,701 17,221
Net cash (used in) provided by investing activities (9,794) (4,425)
Cash flows from financing activities:    
Repayments of long-term debt (116) (32)
Borrowings from long-term debt 4,671 0
Proceeds from stock options exercised and employee stock purchase plan 1,199 218
Payment of employee restricted stock withholdings (828) (333)
Repayments of lines of credit borrowings 0 (2,000)
Net cash (used in) provided by financing activities 4,926 (2,147)
Effect of exchange rate changes on cash and cash equivalents 41 26
Net (decrease) in cash and cash equivalents (2,449) (1,467)
Cash and cash equivalents at beginning of period 8,978 7,017
Cash and cash equivalents at end of period $ 6,529 $ 5,550