Common Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended
	Mar. 27, 2019	Jun. 30, 2019	Dec. 31, 2018
Subsidiary Sale Of Stock [Line Items]
Common stock, shares authorized		10,000,000
Common stock, par value		$ 0.01
Common stock, shares issued		3,615,500	0
Common stock, shares outstanding		3,615,500	0
Stock-based forms of compensation authorized to be issued		0
Dividend payment restrictions		Positive Insurance Company may pay dividends to us after notice to, but without prior approval of, the Pennsylvania Insurance Department in an amount not to exceed the greater of (i) 10% of the surplus of Positive Insurance Company as reported on its most recent annual statement filed with the Pennsylvania Insurance Department, or (ii) the statutory net income of Positive Insurance Company for the period covered by such annual statement. Dividends in excess of this amount are considered “extraordinary” and are subject to the approval of the Pennsylvania Insurance Department
Notice period prior to the payment of extraordinary dividend		30 days
Notice period prior to the payment of ordinary dividend.		10 days
PIC [Member]
Subsidiary Sale Of Stock [Line Items]
Maximum percentage of dividend payable without prior approval of insurance department		10.00%
Amount available for payment of dividends		$ 3.7
IPO [Member]
Subsidiary Sale Of Stock [Line Items]
Common stock issued during period	3,615,500