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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2021
Shares
Shares, Outstanding, Beginning Balance (in shares)	8,373,921
Shares, Granted (in shares)	2,349,197
Shares, Exercised (in shares)	(25,646)
Shares, Forfeited or expired (in shares)	(157,197)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	(33,695)
Shares, Outstanding, Ending Balance (in shares)	10,506,580
Shares, Exercisable (in shares)	5,853,827
Shares, Vested and expected to vest (in shares)	9,693,151
Weighted- Average Exercise Price
Weighted- Average Exercise Price, Outstanding, Beginning Balance (in dollars per share)	$ 21.47
Weighted- Average Exercise Price, Granted (in dollars per share)	10.21
Weighted- Average Exercise Price, Exercised (in dollars per share)	1.44
Weighted- Average Exercise Price, Forfeited (in dollars per share)	16.51
Weighted- Average Exercise Price, Expired (in dollars per share)	21.16
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share)	19.08
Weighted- Average Exercise Price, Exercisable (in dollars per share)	22.61
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share)	$ 19.41
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted- Average Remaining Contractual Term, Outstanding (in years)	7 years 1 month 6 days		6 years 7 months 6 days
Weighted- Average Remaining Contractual Term, Exercisable (in years)	5 years 6 months
Weighted- Average Remaining Contractual Term, Vested and expected to vest (in years)	7 years
Aggregate Intrinsic Value, Outstanding, Ending Balance	$ 904
Aggregate Intrinsic Value, Exercisable	898
Aggregate Intrinsic Value, Vested and expected to vest	$ 903
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 7.48	$ 14.23
Intrinsic value of options exercised	$ 300	$ 1,400
Cash received for options exercised		2,500
Fair value of shares vested	5,400	$ 4,100
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates	$ 38,400
Unrecognized compensation expense recognition period (in years)	1 year 7 months 6 days

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