Investments - Schedule of Investments in Fixed Maturity Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 23,848	$ 18,094
Gross Unrealized Gains	164	40
Gross Unrealized Losses	(3)	(42)
Fair Value	24,009	18,092
U.S. Treasury securities, obligations of U.S. Government agencies and Municipals
Schedule of Available-for-sale Securities [Line Items]
Cost	19,149	11,876
Gross Unrealized Gains	121	6
Gross Unrealized Losses	0	(26)
Fair Value	19,270	11,856
Foreign government
Schedule of Available-for-sale Securities [Line Items]
Cost	50	50
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	50	50
Corporate debt
Schedule of Available-for-sale Securities [Line Items]
Cost	3,725	4,505
Gross Unrealized Gains	26	7
Gross Unrealized Losses	(3)	(16)
Fair Value	3,748	4,496
Short duration fixed income fund
Schedule of Available-for-sale Securities [Line Items]
Cost	924	1,663
Gross Unrealized Gains	17	27
Gross Unrealized Losses	0
Fair Value	$ 941	$ 1,690