Equity (Tables)

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

Summary of Stock Option Activity

A summary of the stock option activity under the Company’s plans for the nine months ended September 30, 2015 is as follows:

	Number of		Weightedaverage
	shares		exercise price
Options outstanding at December 31, 2014		4,012,096	$	2.04
Options granted		1,756,000		4.80
Less:
Options exercised		289,125		1.61
Options canceled or expired		12,500		3.19
Options outstanding at September 30, 2015		5,466,471		2.95
Exercisable at September 30, 2015		2,686,247	$	1.52

Summary of Stock-Based Compensation Expense Recognized for Stock Options and Restricted Stock Included in Consolidated Statements of Operations

Stock based compensation expense recognized for stock options and restricted stock and included in the consolidated statements of operations was allocated as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Research and development expense	$	161	$	200	$	339	$	269
General and administrative expense		667		120		1,395		297
Total stock based compensation expense	$	828	$	320	$	1,734	$	566

Summary of Warrant Activity

A summary of the warrant activity for the nine months ended September 30, 2015 is as follows:

	Number of		Weightedaverage
	shares		exercise price
Warrants outstanding at December 31, 2014		650,000	$	1.48
Warrants granted		—		—
Less:
Warrants exercised		—		—
Warrants canceled or expired		—		—
Warrants outstanding at September 30, 2015		650,000	$	1.48
Exercisable at September 30, 2015		530,000	$	1.49