Fair Value (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value, by Balance Sheet Grouping [Table Text Block]

Fair value at June 30, 2012, was estimated using the following assumptions:

Underlying price per share$0.28-$0.39

Exercise price per share$1.31-$1.65

Risk-free interest rate0.32%-0.44%

Expected holding period1.88-2.63 yrs.

Expected volatility69.2%-79.7%

Expected dividend yieldNone

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Total	Level 1	Level 2	Level 3
Assets:
Marketable Securities-unrestricted	$19,442	$17,384	$ 2,058	$0
Marketable Securities-restricted	7,343	1,010	6,333	0
Liabilities:
Warrants	(144)	0	0	(144)
Total	$26,641	$18,394	$ 8,391	$   (144)

Fair Value, Inputs, Level 3 [Member]

Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value of Redeemable Warrants (in thousands)
	2012	2011
Balance at January 1	$380		$2,805
Fair value adjustment at March 31	151	(302)
Balance at March 31	531	2,503
Fair value adjustment at June 30	(387)	(643)
Balance at June 30	$144	$1,860