Payment of annual bonus compensation.

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Related party retainer compensation.

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Related Party Transaction, Compensation For Services On Board

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Weighted average grant-date fair value of non-vested options outstanding.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Related Party Transactions (Detail) - USD ($)					12 Months Ended
Related Party Transactions (Detail) - USD ($)	Jun. 06, 2019	May 06, 2019	Jun. 01, 2018	May 25, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 03, 2010
Related Party Transaction [Line Items]
Fair value of options					$ 5,500,000	$ 5,500,000	$ 3,600,000
Common stock, fair value (in dollars per share)					$ 3.60	$ 2.67
Options, grants in period, grant price (in dollars per share)					$ 5.77
Executive Vice President
Related Party Transaction [Line Items]
Number of securities called by warrants or rights (in shares)									450,000
Retainer compensation		$ 5,000
Related party transaction, expenses from transactions with related party					$ 93,000.0	$ 163,000.0	242,000.0
Payment of annual bonus compensation					0	58,000.0	31,900
Related party transaction, compensation for services on board					$ 51,300	$ 50,000.0	$ 50,000.0
Common stock shares granted (in shares)	4,269		3,017	10,000
Fair value of options	$ 34,762		$ 11,284	$ 24,700
Common stock, fair value (in dollars per share)	$ 8.14		$ 3.74	$ 2.47
Options, grants in period, grant price (in dollars per share)	$ 22.52		$ 11.60	$ 7.27
Restricted Stock
Related Party Transaction [Line Items]
Restricted common stock shares granted (in shares)					230,980	87,811	372,711
Restricted stock, fair value per share (in dollars per share)					$ 15.75	$ 9.01	$ 7.27	$ 3.59
Restricted Stock \| Executive Vice President
Related Party Transaction [Line Items]
Restricted common stock shares granted (in shares)	3,419		6,897	8,667
Fair value of restricted stock	$ 76,996		$ 80,005	$ 63,009
Restricted stock, fair value per share (in dollars per share)	$ 22.52		$ 11.60	$ 7.27