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Common Stock Warrant Liability (Tables)

6 Months Ended

Jun. 30, 2014

Selected terms and estimated fair value of warrants accounted for as derivative are as follows:

						Fair Value of Warrants (in thousands)
Issuance Date	Number of Warrant Shares Issuable		Exercise Price		Warrant Expiration Date	Value at Issuance Date
Issuance Date	Number of Warrant Shares Issuable		Exercise Price		Warrant Expiration Date	Value at Issuance Date		June 30, 2014		December 31, 2013

5/13/2009		466,667	$	17.25	5/13/2014	$	3,360	$	–	$	–
2/23/2010		916,669		12.75	2/23/2015		5,701		–		6
2/22/2011		4,552,600		1.50	2/22/2016		8,004		3,224		5,419
								$	3,224	$	5,425