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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
OPERATING ACTIVITIES:    
Net loss $ (3,102) $ (15,511)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 2,869 2,835
Depreciation and amortization 3,108 3,221
Unrealized foreign currency loss 139  
Deferred income taxes (43) (659)
Changes in assets and liabilities    
Accounts receivable (1,196) 2,030
Inventories (1,789) 229
Prepaid expenses and other assets (5,981) (977)
Accounts payable (179) 40
Deferred revenue (418) (1,165)
Accrued expenses and other liabilities (3,805) 679
Net cash used in operating activities (10,397) (9,278)
INVESTING ACTIVITIES:    
Purchases of short term investments (4,430)  
Purchases of property and equipment (1,988) (1,092)
Net cash used in investing activities (6,418) (1,092)
FINANCING ACTIVITIES:    
Proceeds from exercise of stock options 202 301
Repurchase of common stock (639) (801)
Net cash used in financing activities (437) (500)
EFFECT OF FOREIGN EXCHANGE RATE CHANGES ON CASH (107) (54)
NET DECREASE IN CASH (17,359) (10,924)
CASH, BEGINNING OF PERIOD 93,191 87,888
CASH, END OF PERIOD 75,832 76,964
Cash paid for:    
Income taxes $ 42 $ 28