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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income $ 2,567 $ 180 $ 982
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation and amortization 475 536 823
Stock-based compensation 1,277 1,495 1,737
Gain on sale of assets     (6,230)
Amortization of discount on investments (9)    
Increase (decrease) from changes in assets and liabilities:      
Accounts receivable 1,422 (1,403) (1,353)
Inventories 1,316 (750) 542
Prepaid expenses and other current assets 22 128 131
Accounts payable (166) 239 (139)
Accrued expenses (590) 177 (377)
Deferred revenue 515 108 487
Net cash provided by (used in) operating activities 6,829 710 (3,397)
Cash flows from investing activities:      
Purchases of property and equipment (331) (118) (168)
Purchases of investments (737)    
Proceeds from sale of assets, net   (100) 6,661
Purchase of other assets   (60)  
Net cash provided by (used in) investing activities (1,068) (278) 6,493
Cash flows from financing activities:      
Proceeds from issuance of common stock 1,826 9 7
Shares surrendered by employees to pay taxes related to unrestricted stock (224) (161)  
Repurchase of common stock (735)   (8,950)
Net cash provided by (used in) financing activities 867 (152) (8,943)
Increase (decrease) in cash and cash equivalents 6,628 280 (5,847)
Cash and cash equivalents, beginning of year 39,949 39,669 45,516
Cash and cash equivalents, end of year $ 46,577 $ 39,949 $ 39,669