Stockholder's Equity (Tables)

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Summary of Warrant Activity

Below is a summary of warrant activity during the six months ended June 30, 2013:

	Common Stock Warrants		Weighted Average Exercise Price
Outstanding at December 31, 2012		395,000	$	5.45
Granted		50,000	$	7.51
Outstanding, at June 30, 2013		445,000	$	5.68
Exercisable, at June 30, 2013		395,000	$	5.45

Share-Based Employee Compensation Expense

Total expense recorded for the three and six month periods ended June 30, 2013 and 2012 is as shown below:

	Three Months Ended June 30,				Six months Ended June 30,
	2013		2012		2013		2012
	($ in ‘000’s)
Research and development	$	485	$	397	$	1,159	$	788
Selling, general and administrative		2,439		2,685		4,512		5,309
Total share based compensation expense	$	2,924	$	3,082	$	5,671	$	6,097

Weighted Average Assumptions used to Estimate Fair Value of Stock Options Granted

Black-Scholes option pricing model with the following assumptions:

	Six-months ended June 30,
	2013			2012
Divided yield		0.00	%		0.00	%
Expected volatility		69.5	%		72.1	%
Risk free interest rate		0.35	%		0.40	%
Expected life (years)		4.95			4.50

Shares of Common Stock Issuable on Conversion or Exercise of Rights Granted Under Prior Financing Arrangements, Stock Options and Warrants

As of June 30, 2013, approximately 16.3 million shares of our common stock, when fully vested, were issuable upon conversion or exercise of rights granted under prior financing arrangements, stock options and warrants, as follows:

Conversion of Series E preferred shares	40,000
Exercise of stock options	10,932,574
Exercise of warrants	445,000
Employee stock purchase plan shares reserved for issuance	4,579,954
Long-term retention and management incentive plan shares reserved for issuance	346,500
Total shares of common stock reserved for future issuances	16,344,028