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Stock-Based Awards (Tables)

9 Months Ended

Sep. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

The following tables summarize the Company’s stock option activity since December 31, 2018 and through September 30, 2019:

		Shares				Weighted				Average
		Issuable				Average				Remaining		Aggregate
		Under				Exercise				Contractual		Intrinsic
		Options				Price				Term		Value
										(in years)		(in thousands)
Outstanding as of December 31, 2018			5,024,371			$	8.85			7.6		$	3,143
Granted			2,276,197			$	4.00
Exercised			(10,667	)		$	0.75
Forfeited			(2,171,621	)		$	7.60
Outstanding as of September 30, 2019			5,118,280			$	7.24			6.4		$	—
Options exercisable as of September 30, 2019			2,701,812			$	9.53			4.2		$	—

Summary of Stock-Based Compensation Expense Related to Stock Options, Restricted Common Stock and ESPP

The Company recorded stock-based compensation expense related to stock options, restricted common stock and the ESPP in the following expense categories within its condensed consolidated statements of operations for the three and nine months ended September 30, 2019 and 2018 as follows:

		Three Months Ended September 30,								Nine Months Ended September 30,
		2019				2018				2019				2018
		(in thousands)
Research and development		$	(359	)		$	1,027			$	1,337			$	4,263
General and administrative			963				1,173				3,218				3,074
		$	604			$	2,200			$	4,555			$	7,337

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
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Tabular disclosure for stock option 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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