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8. Fair value measurements and financial instruments (Tables)
9 Months Ended
Sep. 30, 2013
Fair Value Disclosures [Abstract]  
Reconciliation of changes in fair value
Balance at December 31, 2012   $ 886  
Settlement/conversion of convertible promissory notes     (620 )
Balance at September 30, 2013   $ 266  
The amount of gains (losses) included in earnings attributable to liabilities still held at the end of the period   $ -