Convertible Notes - Interest Expense Incurred (Details) - Convertible debt - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Accrued coupon interest expense	$ 4,176	$ 5,885
Amortization of debt discounts	140	5,730
Amortization of deferred financing offering costs	483	747
Interest expense on debt	4,799	12,362
Related party
Debt Instrument [Line Items]
Accrued coupon interest expense	1,898	550
Amortization of debt discounts	21	533
Amortization of deferred financing offering costs	57	14
Interest expense on debt	1,976	1,097
Others
Debt Instrument [Line Items]
Accrued coupon interest expense	2,278	5,335
Amortization of debt discounts	119	5,197
Amortization of deferred financing offering costs	426	733
Interest expense on debt	$ 2,823	$ 11,265