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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
OPERATING ACTIVITIES:    
NET INCOME (LOSS) $ 3,551 $ (1,962)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation 4,543 4,284
Depreciation and amortization 4,259 4,732
Unrealized foreign currency loss (gain) 450 (73)
Deferred income taxes 198 (33)
Changes in assets and liabilities    
Accounts receivable (1,572) (2,111)
Inventories 633 (3,444)
Prepaid expenses and other assets (614) 576
Accounts payable (72) (284)
Deferred revenue 5,269 10,433
Accrued expenses and other liabilities (1,540) (3,734)
Net cash provided by operating activities 15,105 8,384
INVESTING ACTIVITIES:    
Purchases of short-term investments (19,411) (9,407)
Proceeds from maturities of short-term investments 16,450 4,432
Purchases of property and equipment (1,885) (2,353)
Net cash used in investing activities (4,846) (7,328)
FINANCING ACTIVITIES:    
Proceeds from exercise of stock options 124 546
Repurchase of common stock (883) (639)
Net cash used in financing activities (759) (93)
EFFECT OF FOREIGN EXCHANGE RATE CHANGES ON CASH (1,690) (299)
NET INCREASE IN CASH 7,810 664
CASH, BEGINNING OF PERIOD 92,867 93,191
CASH, END OF PERIOD 100,677 93,855
Cash paid for:    
Income taxes $ 230 $ 42