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Stockholders' Equity - Summary of Stock Option Outstanding (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Option Outstanding - Range of Exercise Prices, Lower Limit	$ 1.17	$ 1.17
Option Outstanding - Range of Exercise Prices, Upper Limit	$ 23.20	$ 26.00
Option Outstanding - Number of Shares	2,445,453	1,773,066	1,389,816
Option Outstanding - Weighted-Average Remaining Contractual Life	7 years 7 months 6 days	6 years 10 months 25 days
Option Outstanding - Weighted Average Exercise Price	$ 3.37	$ 7.02	$ 8.39
Option Exercisable	1,209,087	999,999
Option Exercisable - Weighted Average Exercise Price	$ 4.47	$ 10.05

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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