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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net loss $ 3,512 $ (922)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Provision for doubtful accounts 338 145
Depreciation and amortization 2,669 2,206
Deferred income taxes 103 464
Loss on interest rate swaps 73 64
Compensation expense related to stock-based awards and employee stock purchase plan 2,004 1,868
Changes in operating assets and liabilities:    
Accounts receivable 2,586 3,493
Inventories (1,164) 1,454
Prepaid expenses and other assets (986) (401)
Other non-current assets (631) (370)
Accounts payable (481) (333)
Deferred revenue 2,503 (22)
Accrued expenses 71 (863)
Other long-term liabilities 1,173 (7)
Net cash provided by (used in) operating activities 11,770 6,776
Cash flows from investing activities:    
Capital expenditures (1,444) (4,536)
Net cash paid for business acquired (22,774) 0
Purchases of marketable securities (27,055) (8,705)
Maturities and sales of marketable securities 12,089 9,473
Net cash (used in) provided by investing activities (39,184) (3,768)
Cash flows from financing activities:    
Repayments of long-term debt (443) (65)
Borrowings from long-term debt 4,671 0
Proceeds from stock options exercised and employee stock purchase plan 1,954 695
Payment of employee restricted stock withholdings (828) (333)
Repayments of lines of credit borrowings 0 (2,000)
Proceeds from Long-term Lines of Credit 23,000 0
Net cash (used in) provided by financing activities 28,354 (1,703)
Effect of exchange rate changes on cash and cash equivalents (2) (80)
Net (decrease) in cash and cash equivalents 938 1,225
Cash and cash equivalents at beginning of period 8,978 7,017
Cash and cash equivalents at end of period $ 9,916 $ 8,242