Other Income (Expense), Net

3 Months Ended

Mar. 31, 2021

Other Income And Expenses [Abstract]

Other Income (Expense), Net

6. Other Income (Expense), Net

	Three Months Ended
	March 31
	2021			2020
Other income (expense), net
Investment income	$	80		$	2,055
Interest expense		(1,714	)		(5,869	)
Non-cash interest expense on liability    related to sale of future royalty		(10,925	)		—
Other income (expense)		3			—
Total other income (expense), net	$	(12,556	)	$	(3,814	)

Investment Income

Interest income consists primarily of interest generated from our cash and cash equivalents.

Interest Expense

Interest expense consists primarily of interest on our borrowing activities under our loan agreements and the imputed interest from amount due to AbbVie under the Reacquisition Agreement.

Non-Cash Interest Expense on Liability Related to Sale of Future Royalties

Non-cash interest expense consists of recognition of interest expense based on the Company’s current estimate of future royalties expensed to be paid over the estimated term of the Development Agreement.

Other Income (Expense)

Other income (expense) consists primarily of gains and losses on foreign currency exchange.