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Stock-Based Awards - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares issuable under options, beginning balance	5,024,371
Shares issuable under options, granted	2,276,197
Shares issuable under options, exercised	(10,667)
Shares issuable under options, forfeited	(2,171,621)
Shares issuable under options, ending balance	5,118,280	5,024,371
Shares issuable under options, options exercisable	2,701,812
Weighted-average exercise price, beginning balance	$ 8.85
Weighted-average exercise price, granted	4.00
Weighted-average exercise price, exercised	0.75
Weighted-average exercise price, forfeited	7.60
Weighted-average exercise price, ending balance	7.24	$ 8.85
Weighted-average exercise price, options exercisable	$ 9.53
Average remaining contractual life	6 years 4 months 24 days	7 years 7 months 6 days
Average remaining contractual life, options exercisable	4 years 2 months 12 days
Aggregate intrinsic value		$ 3,143

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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