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Stock Option/Stock Issuance Plan (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
2004 Equity Incentive Plan information
     Outstanding Options
  Options
Available
For Grant		  Number
of Shares		  Weighted
Average
Price Per Share
Balance at December 31, 2009  73,750   849,339  $6.27
  Increase in shares authorized  151,550   —    
  Transferred from 1995 Plan  301,345   —    
  Granted  (858,950)  858,950  $3.00
  Exercised  —   (12,951) $1.96
  Canceled  502,548   (502,548) $2.15
Balance at December 31, 2010  170,243   1,192,790  $2.88
  Increase in shares authorized  152,079   —    
  Granted  (305,450)  (305,450)  $1.92
  Exercised  —   (14,451) $2.06
  Canceled  73,699   (73,699) $2.42
Balance at December 31, 2011  90,571   1,410,090  $2.70
  Increase in shares authorized  193,283   —    
  Granted  (409,900)  409,900  $1.73
  Exercised  —   (7,318) $1.92
  Canceled  188,484   (188,484) $2.65
Balance at December 31, 2012  62,438   1,624,188  $2.47
2004 Plan outstanding and exercisable options by price range
  Options Outstanding  Options Exercisable
Range of
Exercise
Prices		 Number of
Options Outstanding		  Weighted Average Remaining Life (Years)  Weighted
Average Exercise Price		  Number of Options Exercisable  Weighted Average Exercise Price
$1.03 - $1.20  194,600   9.92  $1.09   83,668  $1.13
$1.68 - $1.82  161,823   8.17  $1.82   73,349  $1.82
$1.95 - $2.12  227,110   6.75  $1.99   210,537  $1.99
$2.17 - $2.36  233,687   4.00  $2.29   99,184  $2.29
$2.49 - $3.04  693,279   7.58  $3.01   655,947  $3.02
$3.15 - $3.45  106,542   6.75  $3.34   106,542  $3.34
$6.90 - $7.20  2,307   7.03  $5.42   2,307  $7.03
$10.00 - $11.70  4,190   4.75  $11.07   4,190  $11.07
$15.00  650   2.00  $15.05   650  $15.05
$1.03 - $15.00  1,624,188   7.25  $2.47   1,236,374  $2.65