Investments (Tables)

12 Months Ended

Dec. 31, 2019

Investments [Abstract]

Summary investment holdings

The amortized cost, gross unrealized gains and losses, and fair value of our investments as measured using Level 2 inputs as of December 31, 2019 and 2018 (in thousands) were as follows:

	As of December 31, 2019									As of December 31, 2018
	Amortized Cost		Gross Unrealized					Fair Value		Amortized Cost		Gross Unrealized				Fair Value
			Gains		Losses							Gains		Losses
U.S. Treasury bills	$	10,784	$	270	$	—		$	11,054	$	7,982	$	120	$	—	$	8,102
Corporate bonds	1,705		70		—			1,775		887		17		—		904
Collateralized mortgage obligations	5,472		56		(5		)	5,523		545		6		—		551
Yankees	597		30		—			627		596		11		—		607
Total investments	$	18,558	$	426	$	(5	)	$	18,979	$	10,010	$	154	$	—	$	10,164

Investments classified by contractual maturity date

The amortized cost and fair value of our investments by contractual maturities as of December 31, 2019 and 2018 (in thousands) were as follows:

	As of December 31, 2019				As of December 31, 2018
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in one year or less	$	1,807	$	1,810	$	—	$	—
Due after one year through five years	16,121		16,542		9,666		9,813
Due after five years through ten years	630		627		344		351
Total investments	$	18,558	$	18,979	$	10,010	$	10,164

Schedule of securities held in an unrealized loss position

The Company held the following securities (in thousands) in an unrealized loss position for less than twelve months as of December 31, 2019, and expects to recover the entire cost basis of the security:

	Number of Securities	Fair Value		Unrealized Losses
Collateralized mortgage obligations	4	$	2,075	$	5