Aggregate number of common shares reserved for future issuance.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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Number of additional shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended		91 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Jun. 06, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	10,905,850
Unrecognized compensation expense	$ 0.0
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense	$ 4.4
Unrecognized stock-based compensation expense, weighted average period of recognition	2 years 7 months 6 days
Repurchase of common stock (in shares)	136,519	109,666
2007 Plan and 2010 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	0
Number of shares available for grants				459,956
2011 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance				400,000
Number of shares available for grants				859,956
Increase in shares of common stock authorized for issuance			3,500,000