Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2013

Stockholders' Equity

Schedule of shares of the Company's common stock reserved for future issuance

	June 30, 2013	December 31, 2012
Common stock awards outstanding	2,308,000	1,956,000
Common stock awards available for grant	524,000	438,000
Total common shares reserved for future issuance	2,832,000	2,394,000

Schedule of compensation cost recorded in the statements of operations and comprehensive loss

	Three Months Ended June 30,				Six Months EndedJune 30,
	2013		2012		2013		2012
Research and development	$	1,046,000	$	210,000	$	1,476,000	$	366,000
General and administrative	750,000		243,000		1,256,000		443,000
	$	1,796,000	$	453,000	$	2,732,000	$	809,000

Summary of stock awards activity

	Number ofShares		Weighted- AverageExercise Price
Outstanding at December 31, 2012	1,956,000		$	5.86
Granted	731,000		23.63
Exercised	(295,000	)	2.17
Cancelled	(84,000	)	15.52
Outstanding at June 30, 2013	2,308,000		$	11.60