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CONVERTIBLE REDEEMABLE PREFERRED STOCK
$ in Thousands
 12 Months Ended
Dec. 31, 2013
USD ($)
shares
Increase (decrease) in convertible redeemable preferred stock  
Accruals of dividends and accretion to redemption value $ 2,926
Series A convertible redeemable preferred stock  
Increase (decrease) in convertible redeemable preferred stock  
Balance at beginning of year $ 23,546
Balance at beginning of year (in shares) | shares 18,464,674
Accruals of dividends and accretion to redemption value $ 970
Performance Adjustment of Series A $ (12,239)
Performance Adjustment of Series A (in shares) | shares (9,232,340)
Balance at end of year $ 12,277
Balance at end of year (in shares) | shares 9,232,334
Series B convertible redeemable preferred stock  
Increase (decrease) in convertible redeemable preferred stock  
Balance at beginning of year $ 47,540
Balance at beginning of year (in shares) | shares 27,324,237
Accruals of dividends and accretion to redemption value $ 1,836
Balance at end of year $ 49,376
Balance at end of year (in shares) | shares 27,324,237
Series C convertible redeemable preferred stock  
Increase (decrease) in convertible redeemable preferred stock  
Issuance of new Series C convertible redeemable preferred stock, net of issuance costs of $45 $ 12,034
Issuance of new Series C convertible redeemable preferred stock (in shares) | shares 8,658,008
Accruals of dividends and accretion to redemption value $ 120
Balance at end of year $ 12,154
Balance at end of year (in shares) | shares 8,658,008