Fair Value of Financial Instruments (Tables)

6 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value of Company's Short-Term Investment and Contingent Consideration by Valuation Hierarchy

The following tables present the fair value of the Company’s short-term investments and contingent consideration by valuation hierarchy and input (in thousands):

	As of March 31, 2021
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable (Level 2)		Significant Unobservable (Level 3)			Totals
Short-term investments:
Corporate bonds	$	3,865	$	—	$	—		$	3,865
Total assets	$	3,865	$	—	$	—		$	3,865
Contingent consideration:
Current portion		—		—		(2,324	)		(2,324	)
Non-current portion		—		—		(7,720	)		(7,720	)
Total liabilities	$	—	$	—	$	(10,044	)	$	(10,044	)

	As of September 30, 2020
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable (Level 2)		Significant Unobservable (Level 3)			Totals
Non-current contingent consideration	$	—	$	—	$	(10,962	)	$	(10,962	)

Changes in Fair Value of Company Level 3 Financial Instruments

The following table summarizes changes in the fair value of the Company’s Level 3 financial instruments for the six months ended March 31, 2021:

Balance at October 1, 2020	$	10,962
Fair value adjustments		(697	)
Balance at December 31, 2020		10,265
Fair value adjustments		(221	)
Balance at March 31, 2021	$	10,044