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Accounts Receivable - net (Details)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2013
CNY
Dec. 31, 2013
Trade receivables
USD ($)
Dec. 31, 2012
Trade receivables
USD ($)
Dec. 31, 2013
Aging within one year, net of allowance for doubtful accounts
USD ($)
Dec. 31, 2012
Aging within one year, net of allowance for doubtful accounts
USD ($)
Dec. 31, 2013
Aging greater than one year, net of allowance for doubtful accounts
USD ($)
Dec. 31, 2012
Aging greater than one year, net of allowance for doubtful accounts
USD ($)
Dec. 31, 2013
Other receivables
USD ($)
Dec. 31, 2012
Other receivables
USD ($)
Dec. 31, 2013
Accounts aged more than three years
Dec. 31, 2012
Accounts aged more than three years
Dec. 31, 2013
Accounts receivable aged between two year and three years
Dec. 31, 2012
Accounts receivable aged between two year and three years
Dec. 31, 2013
Accounts receivable aged between one year and two years
Dec. 31, 2012
Accounts receivable aged between one year and two years
Dec. 31, 2013
Accounts receivable aged less than one year
Dec. 31, 2012
Accounts receivable aged less than one year
Dec. 31, 2013
Accounts aged more than two years
Change in estimate of allowance for accounts receivable
Adjustment
USD ($)
Accounts Receivable - net                                          
Accounts receivable, gross         $ 33,743 $ 25,606                              
Allowance for doubtful accounts         (2,429) (2,936)                              
Total accounts receivable 31,927 23,440     31,314 22,670 29,565 22,065 1,749 605 613 770                  
Carrying value of accounts receivable pledged as collateral for a bank loan 5,600     35,000                                  
Percentage allowance for accounts receivable                         100.00% 100.00% 56.30% 100.00% 16.90% 48.50% 1.70% 4.00%  
Operating income 8,745 (21,151) 3,374                                   801
Net income (loss) attributable to stockholders $ 7,442 $ (14,853) $ (844)                                   $ 616
Basic earnings per share $ 0.13 $ (0.27) $ (0.02)                                   $ 0.02
Diluted earnings per share $ 0.13 $ (0.27) $ (0.02)                                   $ 0.01