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Note H - Reconciliation of Beginning and Ending Balances for Derivative and Warrant Liability Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Balance at beginning of period $ 27,479 $ 17,728 $ 37,839 $ 15,966
Reclassification of 2013 Convertible Notes (1,110) (1,110)
Exercise of warrants (673) (755)
Adjustment to fair value (20,763) 22,661 (31,041) 24,423
Balance at end of period $ 6,043 $ 39,279 $ 6,043 $ 39,279