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Stock-Based Compensation - Additional Information (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation cost related to unvested awards | $ | $ 5.5
2014 Stock Incentive Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Total aggregate number of shares of common stock that may be issued | 12,840,000
Number of common stock available for future issuance | 5,724,953
Stock Appreciation Rights [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Fair value assumptions method used | Black-Scholes option-pricing formula

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