Stockholders' Equity - Summary of Stock Option Plan Activity (Detail) - $ / shares	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Number of Options
Number of Options, Outstanding at Beginning of the year	3,860	3,860
Number of Options, Granted
Number of Options, Exercised
Number of Options, Adjustment
Number of Options, Forfeited
Number of Options, Outstanding at End of Year	3,860	3,860
Number of Options, Exercisable at End of Year	3,860	3,027
Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding at Beginning Balance	$ 302.55	$ 302.55
Weighted Average Exercise Price, Granted	0	0
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Adjustment
Weighted Average Exercise Price, Forfeited
Weighted Average Exercise Price, Outstanding at Ending Balance	302.55	302.55
Weighted Average Exercise Price, Exercisable	302.55	310.10
Weighted Average Exercise Price, Granted	$ 0	$ 0

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Share based compensation arrangements by share based payment award options adjustments in period weighted average exercise price.

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

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