Marketable Securities (Tables)

3 Months Ended

Dec. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Summary of Amortized Cost and Fair Value, Including Accrued Interest Receivable and Unrealized Holding Gains (Losses) on Short-term and Long-term Marketable Securities

The following is a summary of the amortized cost and the fair value, including accrued interest receivable and unrealized holding gains (losses) on the short-term and long-term marketable securities as of December 31, 2019 and September 30, 2019 (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Losses		Gains		Fair Value
December 31, 2019:
U.S. Treasury securities and obligations of U.S. government agencies	$	6,696	$	—	$	1	$	6,697
Bank certificates of deposits		500		—		—		500
Corporate securities		4,519		—		—		4,519
Municipal securities		2,515		—		—		2,515
Other debt securities		41		—		—		41
	$	14,271	$	—	$	1	$	14,272
September 30, 2019:
U.S. Treasury securities and obligations of U.S. government agencies	$	31,863	$	(2)	$	5	$	31,866
Bank certificates of deposits		750		—		—		750
Corporate securities		4,317		—		1		4,318
Other debt securities		35		—		—		35
	$	36,965	$	(2)	$	6	$	36,969

Fair Value of Marketable Securities by Contractual Maturity

The fair values of the marketable securities by contractual maturities at December 31, 2019 are presented below (in thousands):

	Fair Value
Due in one year or less	$	11,233
Due after one year through five years		—
Due after five years through ten years		—
Due after ten years		3,039
Total marketable securities	$	14,272