Debt - Pre 2020 convertible notes (Details) $ / shares in Units, $ in Thousands					12 Months Ended
	Dec. 28, 2020 shares	Dec. 23, 2020 USD ($)	Feb. 28, 2020 USD ($) NotesSeries	Dec. 19, 2019 USD ($) shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) shares	Sep. 16, 2021 $ / shares	Sep. 15, 2021 $ / shares	Nov. 30, 2018 USD ($)	Jul. 20, 2018 USD ($) NotesSeries
Debt Instrument [Line Items]
Amount borrowed				$ 3,000
Interest rate (stated)				3.00%
Warrants issued on conversion | shares				403,101
Conversion price (per unit) | $ / shares								$ 37.74	$ 25
Debt issuance costs					$ 10,785	$ 29
Amount outstanding					414,735	47,983
Gain (loss) on extinguishment of debt					$ 5,110	5,748	$ (483)
Original debt amount						$ 1,436	$ 34,105
Series B Redeemable Convertible Preferred Stock
Debt Instrument [Line Items]
Warrants issued on conversion | shares							70,408
Pre-2020 Convertible Promissory Notes
Debt Instrument [Line Items]
Amount borrowed			$ 1,400							$ 7,300	$ 1,700
Interest rate (stated)										4.50%	3.50%
Shares issued on conversion | shares	198,750
Warrants issued on conversion | shares	73,538
Number of promissory notes assumed | NotesSeries			1								2
Unpaid interest		$ 100
Gain (loss) on extinguishment of debt		300	$ 200
Interest amount		300
Original debt amount			$ 1,200
Pre-2020 Convertible Promissory Notes | Maximum
Debt Instrument [Line Items]
Interest rate (stated)										10.00%
Merger Agreement | Pre-2020 Convertible Promissory Notes
Debt Instrument [Line Items]
Amount outstanding		7,300
Unpaid interest		$ 500