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Stockholders' Equity (Deficit) (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Share-based Compensation, Allocation of Recognized Period Costs

Total stock-based compensation expense for employees and non-employees recognized in the statements of operations was as follows (in thousands):

		Three Months Ended September 30,								Nine Months Ended September 30,
		2018				2017				2018				2017
		(unaudited)								(unaudited)
Research and development		$	475			$	322			$	1,217			$	676
General and administrative			519				267				1,347				541
Total stock-based compensation expense		$	994			$	589			$	2,564			$	1,217

Schedule of Stock Option and Restricted Stock Activity

The table below summarizes stock option and restricted award activity under the 2011 and 2018 Plan:

		Number of Shares Outstanding				Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Term (Years)				Aggregate Intrinsic Value (in thousands)
Balances at December 31, 2017			2,506,926			$	3.50				8.79			$	24,033
Forfeited			(6,772	)		$	7.01
Exercised			(254,186	)		$	1.94								1,786
Granted			804,099			$	9.87
Balances at September 30, 2018			3,050,067			$	5.31				8.53			$	14,880

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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-Name Accounting Standards Codification
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- Definition

Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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