Marketable Securities (Tables)

6 Months Ended

Mar. 31, 2021

Marketable Securities [Abstract]

Marketable Securities

The amortized cost and fair value of marketable securities as of September 30, 2020 were as follows:

(in thousands)	September 30, 2020
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Corporate notes/bonds	$	58,793	$	323	$	(17	)	$	59,099

Unrealized Gain (Loss) on Investments

The following table summarizes the fair value and gross unrealized losses aggregated by category and the length of time that individual securities had been in a continuous unrealized loss position as of September 30, 2020:

(in thousands)	September 30, 2020
	Less than twelve months					Greater than twelve months				Total
	Fair Value		Gross unrealized loss			Fair Value		Gross unrealized loss		Fair Value		Gross unrealized loss
Corporate notes/bonds	$	9,841	$	(17	)	$	—	$	—	$	9,841	$	(17	)

Investments Classified by Contractual Maturity Date

The following table presents our marketable securities by contractual maturity date as of September 30, 2020:

(in thousands)	September 30, 2020
	Amortized cost		Fair value
Due in one year or less	$	27,727	$	27,899
Due after one year through three years		31,066		31,200
Total	$	58,793	$	59,099