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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net loss $ (2,137) $ (4,609)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 3,541 3,800
Stock-based compensation 1,530 1,488
Reversal of uncertain tax positions (1,421) (967)
Loss on asset disposal 187 0
Gain on sale of patents 0 (1,600)
Gain on sale of marketable securities 0 (264)
Deferred income tax expense 0 69
Other non-cash tax expense 0 26
Other 42 89
Changes in operating assets and liabilities:    
Accounts receivable, net 801 130
Inventories (622) 175
Prepaid expenses and other current and long-term assets, net 583 808
Accounts payable (611) 787
Accrued current and long-term liabilities 610 (167)
Income taxes payable 256 195
Net cash provided by (used in) operating activities 2,759 (40)
Cash flows from investing activities:    
Purchases of property and equipment (1,275) (2,017)
Proceeds from sales and maturities of marketable securities 0 12,961
Proceeds from sale of patents 0 1,600
Net cash provided by (used in) investing activities (1,275) 12,544
Cash flows from financing activities:    
Payments on asset financings (1,454) (2,219)
Proceeds from issuances of common stock 444 312
Repurchase of debentures 0 (15,779)
Net proceeds from equity offering 0 8,327
Payments on line of credit 0 (3,000)
Net cash used in financing activities (1,010) (12,359)
Net change in cash and cash equivalents 474 145
Cash and cash equivalents, beginning of period 15,092 16,872
Cash and cash equivalents, end of period $ 15,566 $ 17,017