Investment Securities (Tables)

9 Months Ended

Sep. 30, 2017

Investments Debt And Equity Securities [Abstract]

Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Estimated Fair Values of Fixed-Maturity Securities

The amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of total fixed-maturity securities and total fixed-maturity securities held in trust at September 30, 2017, are as follows:

	September 30, 2017
Class of securities:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government treasury securities	$	250	$	—	$	—		$	250
Obligations of U.S. government sponsored enterprises		2,749		—		(7	)		2,742
Corporate debt securities		3,683		—		(2	)		3,681
Foreign corporate debt securities		3,750		—		(1	)		3,749
Total fixed-maturity securities		10,432		—		(10	)		10,422
Less total unrestricted fixed-maturity securities		1,402		—		(2	)		1,400
Total fixed-maturity securities held in trust	$	9,030	$	—	$	(8	)	$	9,022

The amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of total fixed-maturity securities and total fixed-maturity securities held in trust at December 31, 2016, are as follows:

	December 31, 2016
Class of securities:	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government treasury securities	$	249	$	—	$	—		$	249
Obligations of U.S. government sponsored enterprises		59,450		1		(80	)		59,371
Corporate debt securities		11,415		9		(9	)		11,415
Foreign corporate debt securities		5,798		5		(7	)		5,796
Total fixed-maturity securities		76,912		15		(96	)		76,831
Less total unrestricted fixed-maturity securities		47,635		—		(10	)		47,625
Total fixed-maturity securities held in trust	$	29,277	$	15	$	(86	)	$	29,206

Schedule of Amortized Cost and Estimated Fair Value of Fixed-Maturity Securities by Contractual Maturity

Amortized cost and estimated fair value of fixed-maturity securities at September 30, 2017 by contractual maturity are as follows:

	Amortized Cost		Estimated Fair Value
Maturity in:
2017	$	6,750	$	6,749
2018		3,682		3,673
Total fixed-maturity securities	$	10,432	$	10,422

Summary of Net Investment Income

Net investment income for the three and nine months ended September 30, 2017 and 2016, respectively, is summarized as follows:

	Three months ended September 30, 2017			Three months ended September 30, 2016			Nine months ended September 30, 2017			Nine months ended September 30, 2016
Investment income:
Amortization of premium or discount on fixed-maturity securities	$	(32	)	$	(74	)	$	(108	)	$	(247	)
Investment income on fixed-maturity securities		72			233			403			792
Interest income on cash and cash equivalents		1,895			405			4,527			1,100
Realized net (loss) gain from sale of investments		(36	)		18			(63	)		19
Unrealized gain (loss) on trading securities held at period end		44			(84	)		67			83
Net investment income	$	1,943		$	498		$	4,826		$	1,747

Schedule of Investments in Accordance with Fair Value Measurement

The following table shows how the Company’s investments are categorized in accordance with fair value measurement, as of

September 30, 2017:

	September 30, 2017
	Level 1		Level 2		Level 3		Total
Class of securities:
U.S. government treasury securities	$	250	$	—	$	—	$	250
Obligations of U.S. government sponsored enterprises		1,497		1,245		—		2,742
Corporate debt securities		3,151		530		—		3,681
Foreign corporate debt securities		3,749		—		—		3,749
Total fixed-maturity securities		8,647		1,775		—		10,422
Money market funds		32,007		—		—		32,007
Total	$	40,654	$	1,775	$	—	$	42,429

The following table shows how the Company’s investments are categorized in accordance with fair value measurement, as of December 31, 2016:

	December 31, 2016
	Level 1		Level 2		Level 3		Total
Class of securities:
U.S. government treasury securities	$	249	$	—	$	—	$	249
Obligations of U.S. government sponsored enterprises		47,489		11,882		—		59,371
Corporate debt securities		7,033		4,382		—		11,415
Foreign corporate debt securities		5,796		—		—		5,796
Total fixed-maturity securities		60,567		16,264		—		76,831
Money market funds		4,548		—		—		4,548
Total	$	65,115	$	16,264	$	—	$	81,379

Summary of Transfers between Level 1 and Level 2

	January 1, 2017 to September 30, 2017				January 1, 2016 to  December 31, 2016
	Transfers from Level 1 to Level 2		Transfers from Level 2 to Level 1			Transfers from Level 1 to Level 2		Transfers from Level 2 to Level 1
Class of securities:
Corporate debt securities	$	—	$	901		$	—	$	5,737
Foreign corporate debt securities		—		—			—		5,295
Total transfers	$	—	$	901		$	—	$	11,032