Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments

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Derivative Instruments
 3 Months Ended
Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative Instruments
Derivative Instruments

Certain embedded features of our convertible securities and notes payable, as well as warrants to purchase our common stock, may be treated as derivative liabilities. See Notes 1b(3) and 2. At March 31, 2014, derivative liabilities consist of the Series JJ warrants issued to Crede in September 2013. The estimated fair values of the derivative liabilities are recorded as non-current liabilities on the consolidated balance sheet. Changes in the estimated fair values of the derivative liabilities are recorded in the consolidated statement of operations as non-cash income (expense). We do not use derivative instruments for hedging of market risks or for trading or speculative purposes.

The net effect of marking the Company's derivative liabilities to market during the three-month period ended March 31, 2014 resulted in net increases in the estimated fair values of the derivative liabilities of approximately $1,000, which were recorded as a non-cash change in the fair value of financial instruments. The total estimated fair value of our derivative liabilities was $7.7 million as of March 31, 2014. No derivative liabilities were outstanding as of March 31, 2013.