Investment Securities (Tables)

6 Months Ended

Jun. 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 June 30, 2017, are as follows:

	June 30, 2017
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		11,512		—		(46	)		11,466
Corporate debt securities		7,596		1		(9	)		7,588
Foreign corporate debt securities		4,758		2		(1	)		4,759
Total fixed-maturity securities		24,115		3		(56	)		24,062
Less total unrestricted fixed-maturity securities		1,704		—		(4	)		1,700
Total fixed-maturity securities held in trust	$	22,411	$	3	$	(52	)	$	22,362

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 June 30, 2017 by contractual maturity are as follows:

	Amortized Cost		Estimated Fair Value
Maturity in:
2017	$	9,027	$	9,025
2018		14,299		14,248
2019		789		789
Total fixed-maturity securities	$	24,115	$	24,062

Summary of Net Investment Income

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

	Three months ended June 30, 2017			Three months ended June 30, 2016			Six months ended June 30, 2017			Six months ended June 30, 2016
Investment income:
Amortization of premium or discount on fixed-maturity securities	$	(45	)	$	(51	)	$	(76	)	$	(173	)
Investment income on fixed-maturity securities		153			241			331			559
Interest income on cash and cash equivalents		1,618			367			2,632			695
Realized net (loss) gain from sale of investments		(25	)		5			(27	)		1
Unrealized gain on trading securities held at period end		2			36			23			167
Net investment income	$	1,703		$	598		$	2,883		$	1,249

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

June 30, 2017:

	June 30, 2017
	Level 1		Level 2		Level 3		Total
Class of securities:
U.S. government treasury securities	$	249	$	—	$	—	$	249
Obligations of U.S. government sponsored enterprises		4,503		6,963		—		11,466
Corporate debt securities		4,519		3,069		—		7,588
Foreign corporate debt securities		4,759		—		—		4,759
Total fixed-maturity securities		14,030		10,032		—		24,062
Money market funds		43,366		—		—		43,366
Total	$	57,396	$	10,032	$	—	$	67,428

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 June 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	$	—	$	1,000		$	—	$	5,737
Foreign corporate debt securities		—		—			—		5,295
Total transfers	$	—	$	1,000		$	—	$	11,032