Debt - Narrative (Details)		1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 09, 2020 USD ($)	Dec. 31, 2022 USD ($) $ / shares	May 31, 2022 USD ($) day $ / shares $ / item shares	Mar. 31, 2021 USD ($) day $ / shares $ / item	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) $ / shares	Jun. 01, 2022 USD ($)	May 24, 2022 $ / shares	Mar. 04, 2021 $ / shares
Debt Instrument [Line Items]
Purchase of capped call							$ 0	$ 31,671,000
Common Stock
Debt Instrument [Line Items]
Stock price (in USD per share) | $ / shares											$ 41.31
Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Convertible debt, conversion ratio				0.0301427
Stock price (in USD per share) | $ / shares												$ 26.02
Cap price (in USD per per share) | $ / item				45.535
Premium over stock price (percent)				75.00%
Capped-call transaction term, consecutive trading days | day				40
Purchase of capped call				$ 16,100,000
Convertible Senior Notes Due 2026 | Common Stock
Debt Instrument [Line Items]
Conversion price (in dollars per share) | $ / shares				$ 33.18
Convertible Senior Notes Due 2028
Debt Instrument [Line Items]
Convertible debt, conversion ratio			0.018986
Stock price (in USD per share) | $ / shares												41.31
Cap price (in USD per per share) | $ / item			82.62
Premium over stock price (percent)			100.00%
Capped-call transaction term, consecutive trading days | day			40
Purchase of capped call			$ 32,000,000.0
Convertible Senior Notes Due 2028 | Common Stock
Debt Instrument [Line Items]
Conversion price (in dollars per share) | $ / shares			$ 52.67
Convertible Senior Notes Due 2029
Debt Instrument [Line Items]
Stock price (in USD per share) | $ / shares												$ 49.66
Cap price (in USD per per share) | $ / item			99.21
Premium over stock price (percent)			100.00%
Capped-call transaction term, consecutive trading days | day			40
Purchase of capped call			$ 25,100,000
Convertible Senior Notes Due 2029 | Common Stock
Debt Instrument [Line Items]
Conversion price (in dollars per share) | $ / shares		$ 58.35							$ 58.35
Loan and Security Agreement | Silicon Valley Bank | Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate	5.00%
Debt instrument term	4 years
Maximum borrowing capacity	$ 30,000,000
Qualifying accounts receivable	80.00%
Commitment fee amount	$ 300,000
Anniversary fee amount	$ 300,000
Loan and Security Agreement | Silicon Valley Bank | Revolving Credit Facility | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Convertible notes
Debt Instrument [Line Items]
Carrying amount		$ 416,459,000			$ 418,129,000		$ 418,129,000		$ 416,459,000
Number of days to file annual report					15 days		15 days
Number of days, written notice					60 days		60 days
Percentage of note holders					0.25		0.25
Number of days with additional interest, after default					360 days		360 days
Interest expense					$ 3,500,000	$ 2,100,000	$ 10,500,000	$ 4,600,000
Convertible notes | Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Notes issued				$ 138,300,000
Carrying amount of convertible debt				$ 69,100,000
Interest rate			2.25%	2.25%
Proceeds from convertible notes, net of unamortized debt issuance costs				$ 133,600,000
Cash exchanged			$ 45,776,000
Payment of accrued interest			300,000
Extinguishment of debt			$ 69,125,000
Shares issued in debt conversion (in shares) | shares			1,354,348
Carrying amount		67,572,000			67,922,000		67,922,000		67,572,000	$ 69,100,000
Redemption threshold percentage of stock price trigger				130.00%
Redemption threshold trading days | day				20
Redemption threshold consecutive trading days | day				30
Redemption price, percentage				100.00%
Required outstanding amount not subject to redemption				$ 50,000,000
Incremental repurchase amount					1,000		$ 1,000
Effective interest rate during period							2.98%
Convertible notes | Convertible Senior Notes Due 2026 | Occurrence of Fundamental Change
Debt Instrument [Line Items]
Redemption price, percentage				100.00%
Incremental repurchase amount				$ 1,000
Convertible notes | Convertible Senior Notes Due 2026 | Level 2
Debt Instrument [Line Items]
Convertible debt at fair value					49,100,000		$ 49,100,000
Convertible notes | Convertible Senior Notes Due 2026, First Conversion Trigger
Debt Instrument [Line Items]
Conversion threshold trading days | day				20
Threshold consecutive trading days | day				30
Conversion threshold percentage of stock price trigger				130.00%
Convertible notes | Convertible Senior Notes Due 2026, Second Conversion Trigger
Debt Instrument [Line Items]
Conversion threshold trading days | day				5
Threshold consecutive trading days | day				5
Conversion threshold percentage of stock price trigger				98.00%
Incremental repurchase amount					1,000		1,000
Convertible notes | Convertible Senior Notes Due 2028
Debt Instrument [Line Items]
Notes issued			$ 240,000,000
Interest rate			2.25%
Proceeds from convertible notes, net of unamortized debt issuance costs			$ 232,400,000
Additional principal			$ 10,000,000
Carrying amount		233,092,000			233,984,000		233,984,000		233,092,000
Redemption threshold percentage of stock price trigger			130.00%
Redemption threshold trading days | day			20
Redemption threshold consecutive trading days | day			30
Redemption price, percentage			100.00%
Required outstanding amount not subject to redemption			$ 100,000,000
Incremental repurchase amount					1,000		$ 1,000
Effective interest rate during period							2.82%
Convertible notes | Convertible Senior Notes Due 2028 | Occurrence of Fundamental Change
Debt Instrument [Line Items]
Redemption price, percentage			100.00%
Incremental repurchase amount			$ 1,000
Convertible notes | Convertible Senior Notes Due 2028 | Voce Capital Management LLC
Debt Instrument [Line Items]
Notes issued			$ 230,000,000
Convertible notes | Convertible Senior Notes Due 2028 | Level 2
Debt Instrument [Line Items]
Convertible debt at fair value					143,900,000		$ 143,900,000
Convertible notes | Convertible Senior Notes Due 2028, First Conversion Trigger
Debt Instrument [Line Items]
Conversion threshold trading days | day			20
Threshold consecutive trading days | day			30
Redemption threshold percentage of stock price trigger			130.00%
Convertible notes | Convertible Senior Notes Due 2028, Second Conversion Trigger
Debt Instrument [Line Items]
Conversion threshold trading days | day			5
Threshold consecutive trading days | day			5
Conversion threshold percentage of stock price trigger			98.00%
Incremental repurchase amount					$ 1,000		$ 1,000
Convertible notes | Convertible Senior Notes Due 2029
Debt Instrument [Line Items]
Notes issued		$ 120,000,000							$ 120,000,000
Interest rate		4.00%			4.00%		4.00%		4.00%
Proceeds from convertible notes, net of unamortized debt issuance costs		$ 115,800,000
Convertible debt, conversion ratio									0.0171378
Carrying amount		$ 115,795,000			$ 116,223,000		$ 116,223,000		$ 115,795,000
Redemption threshold percentage of stock price trigger				130.00%
Redemption threshold trading days | day				20
Redemption threshold consecutive trading days | day				30
Redemption price, percentage				100.00%
Required outstanding amount not subject to redemption				$ 100,000,000
Incremental repurchase amount				$ 1,000
Effective interest rate during period							4.63%
Convertible notes | Convertible Senior Notes Due 2029 | Occurrence of Fundamental Change
Debt Instrument [Line Items]
Redemption price, percentage				100.00%
Incremental repurchase amount				$ 1,000
Convertible notes | Convertible Senior Notes Due 2029 | Level 2
Debt Instrument [Line Items]
Convertible debt at fair value					$ 69,400,000		$ 69,400,000
Convertible notes | Convertible Senior Notes, Additional Interest, Up To 180 Days
Debt Instrument [Line Items]
Interest rate					0.25%		0.25%
Convertible notes | Convertible Senior Notes, Additional Interest, 181 Days - 360 Days
Debt Instrument [Line Items]
Interest rate					0.50%		0.50%