Stock-based Compensation - Summary of Stock Option Activity (Detail) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Forfeited (in shares)	(578,445)
Amended And Restated Two Thousand Fourteen Stock Incentive Plan \| Stock Options
Number of Shares
Outstanding beginning balance (in shares)		539,896
Granted (in shares)	832,500	1,096,050
Exercised (in shares)	0	0
Forfeited (in shares)		(156)
Expired (in shares)	(70)
Outstanding ending balance (in shares)	1,889,775
Options exercisable at December 31, 2018 (in shares)	490,513	1,635,790
Options vested and expected to vest at December 31, 2018 (in shares)	1,889,775
Weighted- Average Exercise Price
Outstanding beginning balance (in usd per share)	$ 11.08	$ 31.40
Granted (in usd per share)	0.79	1.08
Exercised (in usd per share)	0.00	0.00
Expired (in usd per share)	59.48
Forfeited (in usd per share)	28.52	59.48
Outstanding ending balance (in usd per share)	1.21	$ 11.08
Options exercisable at December 31, 2018 (in usd per share)	1.99
Options vested and expected to vest at December 31, 2018 (in usd per share)	$ 1.21
Weighted- Average Remaining Contractual Life (Years)
Outstanding at December 31, 2018	8 years 10 months 18 days
Options exercisable at December 31, 2018	8 years 7 months 17 days
Options vested and expected to vest at December 31, 2018	8 years 10 months 18 days
Aggregate Intrinsic Value
Outstanding at December 31, 2018	$ 46,599
Options exercisable at December 31, 2018	16,091
Options vested and expected to vest at December 31, 2018	$ 46,559

Share based compensation arrangement by share based payment award options outstanding aggregate intrinsic value.

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Share based compensation arrangement by share based payment award options outstanding weighted average remaining contractual term roll forward.

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. 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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Number of fully vested and expected to vest options outstanding that can 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 price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. 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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Number of share options (or share units) exercised during the current period.

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