Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Stock Based Compensation Expense

Stock-based compensation expense, which includes expense for both employees and non-employees, has been reported in the Company’s condensed statements of operations for the three and nine months ended September 30, 2019 and 2018 as follows (in thousands):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2019		2018		2019		2018
Research and development	$	146	$	24	$	430	$	394
General and administrative		759		659		2,101		1,203
Total stock-based compensation	$	905	$	683	$	2,531	$	1,597

Schedule of Stock Option Activity

The following table summarizes the Company’s stock option activity under the Company’s 2013 Equity Incentive Plan and the Company’s 2018 Equity Incentive Plan for the nine months ended September 30, 2019:

						Weighted average
				Weighted average		remaining contractual		Aggregate intrinsic
	Number of shares			exercise price		life (in years)		value
Outstanding as of December 31,    2018		1,529,883		$	8.03
Granted		647,575			10.74
Exercised		(40,041	)		5.49
Forfeitures		(151,216	)		8.87
Outstanding as of September 30, 2019		1,986,201		$	8.90		8.7	$	11,771,966
Options vested and exercisable as of    September 30, 2019		584,780		$	7.29		8.3	$	4,403,891