Subsequent Events (Details) $ / shares in Units, shares in Thousands, $ in Thousands			1 Months Ended			3 Months Ended	9 Months Ended		10 Months Ended
	Nov. 12, 2021 USD ($)	Oct. 08, 2021 USD ($) employee shares	Nov. 05, 2021 USD ($) $ / shares shares	Sep. 10, 2021 shares	Jun. 18, 2021 shares	Feb. 19, 2021 shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)	Sep. 10, 2021 USD ($) $ / shares shares
Subsequent Event [Line Items]
Proceeds from issuance of common stock in at-the-market offering, net of issuance costs							$ 67,189	$ 0
RSUs
Subsequent Event [Line Items]
Number of awards granted (shares) | shares							1,124
2020 Open Market Sales Agreement
Subsequent Event [Line Items]
Issuance of common stock in at-the-market offering (shares) | shares				3,300	4,000	8,200	12,300		15,600
Proceeds from issuance of common stock in at-the-market offering, net of issuance costs							$ 68,700		$ 90,300
Weighted-average sales price per share | $ / shares							$ 5.58		$ 5.80
Subsequent event | Workforce realignment
Subsequent Event [Line Items]
Estimated reduction in workforce | employee		100
Estimated reduction in workforce as percent of total workforce		60.00%
Estimated restructuring charges expected to be incurred		$ 4,000
Subsequent event | Chief Executive Officer
Subsequent Event [Line Items]
Potential cash bonus per retention agreement		$ 300
Subsequent event | Chief Executive Officer | RSUs
Subsequent Event [Line Items]
Number of awards granted (shares) | shares		300
Subsequent event | Chief Financial Officer
Subsequent Event [Line Items]
Potential cash bonus per retention agreement		$ 250
Subsequent event | Chief Financial Officer | RSUs
Subsequent Event [Line Items]
Number of awards granted (shares) | shares		250
Subsequent event | Chief Commercial Officer
Subsequent Event [Line Items]
Potential cash bonus per retention agreement		$ 150
Subsequent event | Chief Commercial Officer | RSUs
Subsequent Event [Line Items]
Number of awards granted (shares) | shares		150
Subsequent event | Term Loan
Subsequent Event [Line Items]
Principal repayment	$ 16,700
Subsequent event | 2020 Open Market Sales Agreement
Subsequent Event [Line Items]
Issuance of common stock in at-the-market offering (shares) | shares			6,000
Proceeds from issuance of common stock in at-the-market offering, net of issuance costs			$ 7,400
Weighted-average sales price per share | $ / shares			$ 1.23