Warrants (Tables)

9 Months Ended

Sep. 30, 2012

Warrants [Abstract]

Weighted-average assumptions

	Three and Nine Months Ended September 30,
	2012			2011
Risk-free interest rate		0.1%-0.3	%		0.1%-1.3	%
Expected dividend yield		0	%		0	%
Expected lives		0.2-1.9 years			1.2-3.4 years
Expected volatility		100.7%-209.1	%		55.3%-88.5%
Shares underlying warrants classified as liabilities		4,784,519			4,824,827
Market value of stock at beginning of year	$	4.50		$	12.72
Market value of stock at end of period	$	15.53		$	6.72

Reconciliation of the change in value of the Company's warrants

	Three Months Ended September 30, 2012			Nine Months Ended September 30, 2012
	(in thousands)			(in thousands)
Balance at beginning of period	$	2,884		$	5,446
Increase (Decrease) in value of warrants		42,716			40,154
Reclassification to shareholders’ equity upon exercise of warrants		(391	)		(391	)
Balance at September 30, 2012	$	45,209		$	45,209

Summary of information about warrant outstanding

Exercise Price	Outstanding Warrants at September 30, 2012	Expiration Date	Weighted Average Remaining Contractual Life (Years)	Exercisable Warrants
$0.0018	2,778	No expiration date	No expiration date	2,778
6.84	167	No expiration date	No expiration date	167
6.96	2,317,281	7/30/2014	2.0	2,317,281
8.70	7,468	1/30/2014	1.0	7,468
10.68	1,568,385	8/31/2014	2.0	1,568,385
14.70	891,385	12/18/2012	0.2	891,385
21.66	34,626	11/13/2012	0.1	34,626
	4,822,090			4,822,090