Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2016		2015
Research and development	$	174	$	18
General and administrative		240		17
Total	$	414	$	35

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		605,134			8.80
Options exercised		—			—
Options canceled		(13,600	)		10.00
Balance at March 31, 2016		1,910,181			4.30