Stock-Based Compensation - Summary of Stock Option Activity and Related Information (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Options, Balance	579,731
Stock Options, Granted	266,674
Stock Options, Exercised	(1,025)
Stock Options, Cancelled	(8,500)
Stock Options, Balance	836,880	579,731
Stock Options, Exercisable	563,731
Weighted-Average Exercise Price, Balance	$ 8.04
Weighted-Average Exercise Price, Granted	4.36
Weighted-Average Exercise Price, Exercised	4.43
Weighted-Average Exercise Price, Canceled	8.10
Weighted-Average Exercise Price, Balance	6.87	$ 8.04
Weighted-Average Exercise Price, Exercisable	$ 7.82
Weighted-Average Remaining Contractual Life (Years), Balance	7 years 4 months 24 days	7 years
Weighted-Average Remaining Contractual Life (Years), Exercisable	6 years 8 months 12 days
Aggregate Intrinsic Value, Balance	$ 120
Aggregate Intrinsic Value, Exercised	$ 1
Aggregate Intrinsic Value, Balance		$ 120

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Number of share options (or share units) exercised during the current period.

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