Share-Based Payments (Tables)

6 Months Ended

Jun. 30, 2013

Share-Based Payments

Schedule of stock-based compensation recognized related to the grant of employee and non-employee stock options, and non-vested stock

	Three Months ended June 30,				Six Months ended June 30,
	2013		2012		2013		2012
		(unaudited)				(unaudited)
Research and development	$	131	$	14	$	239	$	29
Selling, general and administrative		301		39		530		76
Total	$	432	$	53	$	769	$	105

Summary of stock option and SAR activity

				Weighted-
		Weighted-		Average
	Number of	Average		Remaining
	Options	Exercise Price		Contractual Term
Outstanding, December 31, 2012	569,911	$	5.72	7.88
Granted (unaudited)	899,832	$	7.89
Exercised (unaudited)	(40,512)	$	0.66
Forfeited or expired (unaudited)	(11,593)	$	7.00
Outstanding, June 30, 2013 (unaudited)	1,417,638	$	7.23	8.79
As of December 31, 2012
Vested and expected to vest	564,083	$	5.72	7.87
Exercisable	200,312	$	2.11	5.73
As of June 30, 2013
Vested and expected to vest (unaudited)	1,367,439	$	7.22	8.77
Exercisable (unaudited)	173,759	$	2.67	6.00