Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) Segment	Mar. 26, 2018 shares
Summary Of Significant Accounting Policies [Line Items]
Spin-off completed date	Mar. 26, 2018
Common stock distribution ratio at spin-off	13.33%
Common stock shares distributed at spin-off | shares		10,266,613
Operating segments | Segment	1
Right of use assets	$ 2,835
Total operating lease obligation	3,175
ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Right of use assets	3,000
Total operating lease obligation	$ 3,400