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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 3) - Fair Value, Measurements, Recurring - Embedded derivative liabilities - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Purchases, issues, sales, settlements:        
Changes in unrealized gains (losses) included in earnings relating to assets and liabilities held for the period   $ 64   $ (229)
Significant Unobservable Inputs (Level 3)        
Reconciliation of liabilities measured at fair value on a recurring basis using significant unobservable inputs        
Beginning balance $ 0 (3,362) $ (3,392) (3,655)
Total gains (losses) for the period:        
Included in earnings   (64) (20) 229
Purchases, issues, sales, settlements:        
Settlements 0   3,412  
Ending balance $ 0 $ (3,426) $ 0 $ (3,426)