Available-for-Sale Securities (Tables)

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of available-for-sale securities

The following table provides certain information related to available-for-sale debt securities (in thousands):

	As of December 31, 2021
	Cost		Interest		Unrealized Gains		Unrealized Losses		Impairment		Estimated Fair Value
Silk EV Note	$	15,000	$	833	$	4	$	(20)	$	(15,817)	$	—
Total available-for-sale securities	$	15,000	$	833	$	4	$	(20)	$	(15,817)	$	—