Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

The main inputs and assumptions into the fair value model for the Convertible Notes at December 31, 2015 were as follows:



Company's stock price at the end of the period	$	1.59
Expected volatility	67.80		%
Credit spreads	69.21		%
Risk-free interest rate	1.05		%

Measurement of assets and liabilities at fair value on a recurring basis

The liabilities measured at fair value on a recurring basis were as follows:



	Level 1		Level 2		Level 3		Total ^(a)
As of December 31, 2015
Derivative liability for commodity hedges	$	—	$	1,015	$	—	$	1,015
As of December 31, 2014
Derivative liability for commodity hedges	$	—	$	1,615	$	—	$	1,615

^(a)As of December 31, 2015, the entire derivative liability for commodity hedges balance of $1,015 is short-term and is included in accrued and other current liabilities in the Consolidated Balance Sheets. As of December 31, 2014, the short-term portion of the derivative liability for commodity hedges of $1,137 is included in accrued and other current liabilities and the long-term portion of $478 is included in other non-current liabilities in the Consolidated Balance Sheets.