Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Stock-Based Compensation Expense Related to Options Granted to Employees and Consultants

The following table sets forth stock-based compensation expense related to options granted to employees and consultants for all periods presented (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Research and development	$	269	$	29	$	690	$	79
General and administrative		494		113		1,091		167
Total	$	763	$	142	$	1,781	$	246

Summary of Stock Option Activity Under Plans

The following summarizes option activity under the 2012 Equity Incentive Plan and 2015 Stock Option and Incentive Plan:

	Shares Subject to			Weighted Average
	Outstanding Options			Exercise Price Per Share
Balance at December 31, 2015		1,318,647			2.29
Options granted		786,034			10.02
Options exercised		(18,913	)		0.71
Options canceled		(50,991	)		5.19
Balance at September 30, 2016		2,034,777			5.22