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Quarterly Financial Data (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2012
Quarterly Financial Data [Abstract]  
Summary of quarterly results
                                         
    Three Months Ended        

2012

  March 31     June 30     September 30     December 31     Full Year  

Revenue

  $ 10,207     $ 17,003     $ 19,942     $ 20,091     $ 67,243  

Gross profit (loss)

  $ (3,408   $ 11     $ 2,445     $ 912     $ (40

Income (loss) from operations

  $ (6,646   $ (3,098   $ (1,141   $ (2,151   $ (13,036

Income (loss) before income taxes

  $ (6,271   $ (3,386   $ (844   $ (2,085   $ (12,586

Net income (loss)

  $ (3,367   $ (1,312   $ 272     $ (1,131   $ (5,538

Basic income (loss) per common share

  $ (0.15   $ (0.06   $ 0.01     $ (0.05   $ (0.25

Diluted income (loss) per common share

  $ (0.15   $ (0.06   $ 0.01     $ (0.05   $ (0.25

Weighted average common shares outstanding used in computing net income per common share:

                                       

Basic

    22,514,539       22,518,364       22,524,611       22,538,292       22,523,951  

Diluted

    22,514,539       22,518,364       23,050,618       22,538,292       22,523,951  

 

                                         
    Three Months Ended        

2011

  March 31     June 30     September 30     December 31     Full Year  

Revenue

  $ 37,970     $ 43,028     $ 33,637     $ 19,365     $ 134,000  

Gross profit

  $ 23,975     $ 27,200     $ 16,121     $ 2,339     $ 69,635  

Income from operations

  $ 20,250     $ 23,339     $ 11,885     $ (723   $ 54,751  

Income before income taxes

  $ 20,331     $ 23,403     $ 11,775     $ (876   $ 54,633  

Net income

  $ 19,104     $ 9,908     $ 8,186     $ 861     $ 38,059  

Basic income per common share

  $ 0.83     $ 0.43     $ 0.36     $ 0.04     $ 1.67  

Diluted income per common share

  $ 0.80     $ 0.41     $ 0.35     $ 0.04     $ 1.61  

Weighted average common shares outstanding used in computing net income per common share:

                                       

Basic

    22,993,614       23,031,039       22,822,286       22,561,883       22,852,205  

Diluted

    23,943,644       23,928,408       23,410,525       23,102,072       23,596,162