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Common Stock Repurchase Program (Detail) - Common Stock [Member] - USD ($)	Sep. 05, 2019	Jan. 27, 2019	Jun. 15, 2016
Common Stock Repurchase Program June 15, 2016 [Member]
Stockholders Equity Note [Line Items]
Authorization amount for repurchase of common stock			$ 5,000,000
Remaining authorized repurchase amount		$ 1,700,000
Stock Repurchase Program September 5, 2019 [Member] | Subsequent Event [Member]
Stockholders Equity Note [Line Items]
Authorization amount for repurchase of common stock	$ 5,000,000

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