5. FAIR VALUE MEASUREMENT (Tables)

4 Months Ended

Dec. 31, 2012

Fair Value Measurement Tables

Assets and liabilities measured at fair value on a recurring basis

Assets		Level 1		Level 2		Level 3		December 31, 2012
Fair value of cash equivalents	$	35,069	$	0	$	0	$	35,069
Restricted cash		0		163		0		163
Short-term investments		22,096		0		0		22,096
Total	$	57,165	$	163	$	0	$	57,328
Liabilities
Fair value of common stock warrants	$	0	$	0	$	16,405	$	16,405
Total	$	0	$	0	$	16,405	$	16,405
Assets		Level 1		Level 2		Level 3		August 31, 2012
Fair value of cash equivalents	$	13,162	$	0	$	0	$	13,162
Restricted cash		0		169		0		169
Short-term investments		15,307		0		0		15,307
Total	$	28,469	$	169	$	0	$	28,638
Liabilities
Fair value of common stock warrants	$	0	$	0	$	17,266	$	17,266
Total	$	0	$	0	$	17,266	$	17,266
Assets		Level 1		Level 2		Level 3		August 31, 2011
Fair value of cash equivalents	$	13,856	$	0	$	0	$	13,856
Restricted cash		0		114		0		114
Short-term investments		0		0		0		0
Total	$	13,856	$	114	$	0	$	13,970
Liabilities
Fair value of common stock warrants	$	0	$	0	$	23,575	$	23,575
Total	$	0	$	0	$	23,575	$	23,575

Fair Value of Warrant activity

	Four months ended			Fiscal year ended
	December 31,			August 31,
	2012			2012			2011
Fair value of December 2009 direct offering warrants (including placement agent warrants) at beginning of period	$	2.9		$	5.9		$	5.8
December 2009 direct offering warrants exercised		(0.5	)		(4.8	)		(2.7	)
Adjustment to mark to market common stock warrants		0.2			1.8			2.8
December 2009 direct offering common stock warrant liability at end of period		2.6			2.9			5.9
Fair value of August 2010 private placement warrants (including broker warrants) at beginning of period		14.4			17.7			9.9
August 2010 private placement warrants exercised		(1.9	)		(4.7	)		(0.7	)
Adjustment to mark to market common stock warrants		1.3			1.4			8.5
August 2010 private placement common stock warrant liability at fair value at end of period		13.8			14.4			17.7
Total warrant liability at end of period	$	16.4		$	17.3		$	23.6