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Investments (Tables)
 3 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments by Type of Security
The following tables summarize investments by type of security as of December 31, 2021 and September 30, 2021, respectively (amounts shown in thousands):
December 31, 2021:Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Market
Value
Available-for-sale securities:    
U.S. Treasury, short-term$7,711 $— $(11)$7,700 
Asset-backed securities, short-term4,514 — (2)4,512 
Corporate debt securities, short-term125,632 1 (92)125,541 
U.S. Treasury, long-term7,497 — (29)7,468 
Foreign government and agency securities, long-term2,898 — (11)2,887 
Corporate debt securities, long-term46,081 — (181)45,900 
Total$194,333 $1 $(326)$194,008 
September 30, 2021:
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Market
Value
Available-for-sale securities:
U.S. Treasury, short-term$4,222 $1 $— $4,223 
Asset-backed securities, short-term4,812 1 (2)4,811 
Corporate debt securities, short-term140,042 6 (25)140,023 
U.S. Treasury, long-term6,996 1 (2)6,995 
Foreign government and agency securities, long-term2,909 — (1)2,908 
Corporate debt securities, long-term38,184 3 (39)38,148 
Total$197,165 $12 $(69)$197,108 
Schedule of Fair Value of Investments Measured on Recurring Basis The following tables represent the fair value hierarchy of the Company’s investments, convertible senior notes hedge, acquisition-related contingent consideration, and embedded conversion derivative as of December 31, 2021 and September 30, 2021, respectively (amounts shown in thousands):
December 31, 2021:BalanceQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Assets:
    
Short-term investments:    
U.S. Treasury$7,700 $7,700 $— $— 
Asset-backed securities4,512 — 4,512 — 
Corporate debt securities125,541 — 125,541 — 
Total short-term investments at fair value137,753 7,700 130,053 — 
Long-term investments:
U.S. Treasury7,468 7,468 — — 
Foreign government and agency securities2,887 — 2,887 — 
Corporate debt securities45,900 — 45,900 — 
Total long-term investments at fair value56,255 7,468 48,787 — 
Convertible senior notes hedge42,821 — 42,821 — 
Total assets at fair value$236,829 $15,168 $221,661 $— 
Liabilities:
Current liabilities:
Acquisition-related contingent consideration$11,210 $— $— $11,210 
Non-current liabilities:
Acquisition-related contingent consideration5,590 — — 5,590 
Embedded conversion derivative42,821 — 42,821 — 
Total liabilities at fair value$59,621 $— $42,821 $16,800 
September 30, 2021:BalanceQuoted Prices in Active Markets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Assets:
    
Short-term investments:    
U.S. Treasury$4,223 $4,223 $— $— 
Asset-backed securities, short-term4,811 — 4,811 — 
Corporate debt securities140,023 — 140,023 — 
Total short-term investments at fair value149,057 4,223 144,834 — 
Long-term investments:
U.S. Treasury6,995 6,995 — — 
Foreign government and agency securities2,908 — 2,908 — 
Corporate debt securities38,148 — 38,148 — 
Total long-term investments at fair value48,051 6,995 41,056 — 
Convertible senior notes hedge48,208 $— 48,208 $— 
Total assets at fair value$245,316 $11,218 $234,098 $— 
Liabilities:
Current liabilities:
Acquisition-related contingent consideration$11,050 $— $— $11,050 
Non-current liabilities:
Acquisition-related contingent consideration5,720 — — 5,720 
Embedded conversion derivative48,208 — 48,208 — 
Total liabilities at fair value$64,978 $— $48,208 $16,770 
Schedule of Contingent Consideration Measured at Fair Value The following table includes a summary of the contingent consideration measured at fair value using significant unobservable inputs (Level 3) during the three months ended December 31, 2021 (amounts shown in thousands):
Balance at September 30, 2021$16,770 
Expenses recorded due to changes in fair value30 
Balance at December 31, 2021$16,800 
The following table presents the fair value and the change in fair value for the embedded conversion derivative (in thousands):
Embedded conversion derivative
Fair value as of September 30, 2021
$48,208 
Change in fair value(5,387)
Fair value as of December 31, 2021
$42,821