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Accounts Receivable - net (Details) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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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

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