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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net loss $ (638) $ (1,468)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,172 1,254
Reversal of uncertain tax positions (1,044) (331)
Stock-based compensation 502 475
Gain on sale of marketable securities 0 (264)
Gain on sale of patents 0 (1,600)
Deferred income tax expense 0 69
Other non-cash tax benefit 0 26
Other 34 47
Changes in operating assets and liabilities:    
Accounts receivable, net (2,097) 163
Inventories 968 196
Prepaid expenses and other current and long-term assets, net (396) 268
Accounts payable (1,813) (469)
Accrued current and long-term liabilities 479 (201)
Income taxes payable 132 (68)
Net cash used in operating activities (2,701) (1,903)
Cash flows from investing activities:    
Purchases of property and equipment (21) (159)
Proceeds from sales and maturities of marketable securities 0 10,061
Proceeds from sale of patents 0 1,600
Net cash provided by (used in) investing activities (21) 11,502
Cash flows from financing activities:    
Payments on asset financings (867) (922)
Proceeds from issuances of common stock 144 155
Net proceeds from line of credit 0 1,000
Net cash provided by (used in) financing activities (723) 233
Net change in cash and cash equivalents (3,445) 9,832
Cash and cash equivalents, beginning of period 15,092 15,092
Cash and cash equivalents, end of period $ 11,647 $ 26,704