Investments - Schedule of Investments in Fixed Maturity Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 25,661	$ 18,094
Gross Unrealized Gains	243	40
Gross Unrealized Losses	0	(42)
Fair Value	25,904	18,092
U.S. Treasury securities, obligations of U.S. Government agencies and Municipals
Schedule of Available-for-sale Securities [Line Items]
Cost	21,806	11,876
Gross Unrealized Gains	190	6
Gross Unrealized Losses	0	(26)
Fair Value	21,996	11,856
Foreign government
Schedule of Available-for-sale Securities [Line Items]
Cost		50
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		50
Corporate debt
Schedule of Available-for-sale Securities [Line Items]
Cost	3,371	4,505
Gross Unrealized Gains	41	7
Gross Unrealized Losses	0	(16)
Fair Value	3,412	4,496
Short duration fixed income fund
Schedule of Available-for-sale Securities [Line Items]
Cost	484	1,663
Gross Unrealized Gains	12	27
Gross Unrealized Losses	0
Fair Value	$ 496	$ 1,690