Marketable Securities (Tables)

3 Months Ended

Dec. 31, 2020

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, 2020 and September 30, 2020 (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Losses		Gains		Fair Value
December 31, 2020:
Bank certificates of deposits	$	55	$	—	$	—	$	55
Corporate securities		3,410		—		—		3,410
Other debt securities		—		—		—		—
	$	3,465	$	—	$	—	$	3,465
September 30, 2020:
Bank certificates of deposits	$	51	$	—	$	—	$	51
Corporate securities		3,101		—		—		3,101
Other debt securities		16		—		—		16
	$	3,168	$	—	$	—	$	3,168

Fair Value of Marketable Securities by Contractual Maturity

The fair values of the marketable securities by contractual maturities at December 31, 2020 are presented below (in thousands):

	Fair Value
Due in one year or less	$	55
Due after one year through five years		—
Due after five years through ten years		—
Due after ten years		3,410
Total marketable securities	$	3,465