Warrants -Summary of Warrants Outstanding (Details) - $ / shares	3 Months Ended
	Mar. 31, 2022	Jun. 24, 2020
Series E Redeemable Convertible Preferred Stock
Class Of Warrant Or Right [Line Items]
Warrant Issuance Date	2014-08
Shares of Common Stock Underlying Warrants	1,914
Exercise Price/Share	$ 352.65
Expiration Date	2024
Common Stock Warrants
Class Of Warrant Or Right [Line Items]
Warrant Issuance Date	2016-03
Shares of Common Stock Underlying Warrants	3,021
Exercise Price/Share	$ 41.40
Expiration Date	2026
Common Stock Tranche One
Class Of Warrant Or Right [Line Items]
Warrant Issuance Date	2018-03
Shares of Common Stock Underlying Warrants	1,208
Exercise Price/Share	$ 115.95
Expiration Date	2028
Common Stock Tranche Two
Class Of Warrant Or Right [Line Items]
Warrant Issuance Date	2022-03
Shares of Common Stock Underlying Warrants	2,410,933
Exercise Price/Share	$ 0.001
Common Stock Tranche Three
Class Of Warrant Or Right [Line Items]
Warrant Issuance Date	2022-03
Shares of Common Stock Underlying Warrants	3,244,987
Exercise Price/Share	$ 2.062
Expiration Date	2024
Common Stock Tranche Four
Class Of Warrant Or Right [Line Items]
Warrant Issuance Date	2022-03
Shares of Common Stock Underlying Warrants	3,244,987
Exercise Price/Share	$ 2.062
Expiration Date	2027
SVB Term Loan
Class Of Warrant Or Right [Line Items]
Warrant Issuance Date	2020-06
Shares of Common Stock Underlying Warrants	42,894
Exercise Price/Share	$ 11.6565	$ 11.6565
Expiration Date	2030