Subsequent Event - Additional Information (Details) - Subsequent Event - Common Stock	1 Months Ended
	Apr. 30, 2018 USD ($) $ / shares shares
Subsequent Event [Line Items]
Number of shares issued | shares	5,046,510
Public offering price | $ / shares	$ 8.00
Proceeds from issuance of common stock upon initial public offering, net	$ 37,700,000
Underwriting discounts and commissions	2,400,000
Estimated offering costs	$ 280,000
Underwriters' Over-allotment Option
Subsequent Event [Line Items]
Number of shares issued | shares	546,510