Share Repurchase Authorization - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Oct. 31, 2018
Shares Repurchase Authorization [Line Items]
Amount available for future repurchase	$ 32,494,000
Common Stock [Member]
Shares Repurchase Authorization [Line Items]
Shares of common stock repurchased	37,000
Maximum [Member]
Shares Repurchase Authorization [Line Items]
Stock repurchase, authorized amount		$ 40,000,000