Share-Based Payments (Tables)

9 Months Ended

Sep. 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 September 30,				Nine Months ended September 30,
	2013		2012		2013		2012
		(unaudited)				(unaudited)
Research and development	$	134	$	67	$	373	$	96
Selling, general and administrative		357		64		887		139
Total	$	491	$	131	$	1,260	$	235

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)	951,082	$	7.81
Exercised (unaudited)	(45,387)	$	0.83
Forfeited or expired (unaudited)	(17,218)	$	7.00
Outstanding, September 30, 2013 (unaudited)	1,458,388	$	7.23	8.70
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 September 30, 2013
Vested and expected to vest (unaudited)	1,414,392	$	7.20	8.69
Exercisable (unaudited)	194,322	$	3.93	6.09