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Short Term Debt (Tables)
9 Months Ended
Sep. 30, 2015
Debt Disclosure [Abstract]  
Short Term Debt - Summary of Short Term Debt
   RMB  RMB  RMB
(in thousands)  Loan borrowing  Warrant discount  Long-term
Debt
      Beginning balance December 31, 2014  $5,000   $(139)  $4,861 
        Amortization of discount to interest cost   —      139    139 
        Repayment of RMB Loan   (5,000)   —      (5,000)
      Ending balance September 30, 2015  $—     $—     $—   
Short Term Debt Interest
(in thousands)  Three months ended
September 30,
  Nine months ended
September 30,
   2015  2014  2015  2014
RMB Loan interest                    
  Interest paid in cash  $95   $54   $228   $150 
  Amortization of the RMB Warrants discount   31    54    139    162 
  Amortization of RMB deferred financing costs   28    49    126    147 
    Total interest expense related to the RMB Loan   154    157    493    459 
UBS secured credit line   —      —      —      4 
    Total  $154   $149   $493   $463