Fair Value Measurements (Tables)

3 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Financial Assets Measured at Fair Value on a Recurring Basis

The Company's financial assets measured at fair value on a recurring basis subject to the disclosure requirements at December 31, 2021, were as follows (in thousands):

	Fair Value Measurements at Reporting Date Using
	Quoted Prices in Active Markets for Identical Securities (Level 1)		Significant Other  Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at December 31, 2021
Cash equivalents	$	19,265	$	779	$	—	$	20,044
Short-term investments
Available-for-sale securities — certificates of deposits	—		992		—		992
Available-for-sale securities — corporate bonds and notes	—		177,093		—		177,093
Available-for-sale securities — municipal bonds and notes	—		15,359		—		15,359
Available-for-sale securities — U.S. government securities	—		135,934		—		135,934
Available-for-sale securities — U.S. government agency securities	—		17,170		—		17,170
Long-term investments
Available-for-sale securities — corporate bonds and notes	—		48,638		—		48,638
Available-for-sale securities — municipal bonds and notes	—		2,239		—		2,239
Available-for-sale securities — U.S. government securities	—		24,341		—		24,341
Available-for-sale securities — U.S. government agency securities	—		1,773		—		1,773
Total	$	19,265	$	424,318	$	—	$	443,583

The Company's financial assets measured at fair value on a recurring basis subject to the disclosure requirements at September 30, 2021, were as follows (in thousands):

	Fair Value Measurements at Reporting Date Using
	Quoted Prices in Active Markets  for Identical Securities (Level 1)		Significant Other  Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at September 30, 2021
Cash equivalents	$	17,150	$	4,397	$	—	$	21,547
Short-term investments
Available-for-sale securities — certificates of deposits	—		255		—		255
Available-for-sale securities — corporate bonds and notes	—		186,107		—		186,107
Available-for-sale securities — municipal bonds and notes	—		13,566		—		13,566
Available-for-sale securities — U.S. government securities	—		102,615		—		102,615
Available-for-sale securities — U.S. government agency securities	—		27,087		—		27,087
Long-term investments
Available-for-sale securities — corporate bonds and notes	—		53,107		—		53,107
Available-for-sale securities — municipal bonds and notes	—		11,111		—		11,111
Available-for-sale securities — U.S. government securities	—		59,608		—		59,608
Available-for-sale securities — U.S. government agency securities	—		8,952		—		8,952
Total	$	17,150	$	466,805	$	—	$	483,955

Property, Plant and Equipment

Impairment charges were allocated to the following income statement line items for the three months ended December 31, 2021 and 2020 (in thousands):

	Three months ended December 31,
	2021		2020
Cost of net product revenue	$	—	$	1,968
Cost of net service revenue	—		1
Sales and marketing	6,175		1,259
Research and development	—		3,129
General and administrative	—		516
Total impairment charges	$	6,175	$	6,873