Subsequent Events (Details) - USD ($) $ in Thousands		3 Months Ended
	Apr. 06, 2018	Mar. 31, 2018
Subsequent Event [Line Items]
Over-allotment option, percent		15.00%
Over-allotment option		$ 22,500
Over-allotment option period		13 days
Subsequent event
Subsequent Event [Line Items]
Additional proceeds	$ 21,500
Long-term debt	14,600
Equity component	6,900
Debt issuance costs	645
Subsequent event | Long-term debt
Subsequent Event [Line Items]
Debt issuance costs	439
Subsequent event | Additional paid-in capital
Subsequent Event [Line Items]
Debt issuance costs	$ 206