Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

4. Fair Value of Financial Instruments

Financial instruments reported at fair value on a recurring basis include cash equivalents and marketable securities. The following tables present the fair value of cash equivalents and marketable securities in accordance with the hierarchy discussed in Note 2 (in thousands): 

	Quoted		Significant
	prices		other		Significant
	in active		observable		unobservable
	markets		inputs		inputs
	(Level 1)		(Level 2)		(Level 3)		Total
March 31, 2022
Cash equivalents:
Money market mutual funds	$	—	$	124,116	$	—	$	124,116
Total cash equivalents		—		124,116		—		124,116
Marketable securities:
U.S. government and agency securities		—		173,537		—		173,537
Certificates of deposit		—		3,591		—		3,591
Corporate bonds		—		395,792		—		395,792
Total marketable securities		—		572,920		—		572,920
Total cash equivalents and marketable securities	$	—	$	697,036	$	—	$	697,036

	Quoted		Significant
	prices		other		Significant
	in active		observable		unobservable
	markets		inputs		inputs
	(Level 1)		(Level 2)		(Level 3)		Total
December 31, 2021
Cash equivalents:
Money market mutual funds	$	—	$	236,340	$	—	$	236,340
Total cash equivalents		—		236,340		—		236,340
Marketable securities:
U.S. government and agency securities		—		59,889		—		59,889
Certificates of deposit		—		2,927		—		2,927
Corporate bonds		—		441,321		—		441,321
Total marketable securities		—		504,137		—		504,137
Total cash equivalents and marketable securities	$	—	$	740,477	$	—	$	740,477

Management estimates that the carrying values of its current accounts receivable, other current assets, accounts payable, accrued expenses and other current liabilities approximate fair value due to the short-term nature of those instruments. Accounts receivable which contain non-current portions are recorded at their present values using a discount rate that is based on prevailing market rates and the credit profile of the licensee on the date the amounts are initially recorded. Certain non-current payables reported as other liabilities on the consolidated balance sheets are recorded at their present values using a discount rate that is based on prevailing market rates and the credit profile of the Company on the date the amounts are initially recorded. Management does not believe there have been any significant changes in market conditions or credit quality that would cause the discount rates initially used to be materially different from those that would be used as of March 31, 2022 to determine the present value of these receivables and liabilities. Accordingly, management estimates that the carrying values of its non-current accounts receivable and other liabilities approximate the fair value of those instruments. Management estimates that the carrying value of the liability related to the sale of future royalties approximates fair value. As discussed in Note 6, the carrying value of the liability related to the sale of future royalties is based on the Company’s estimate of future royalties expected to be paid to HCR over the life of the arrangement, which are considered Level 3 inputs.

Non-marketable Equity Securities

Non-marketable equity securities are measured at cost less impairment, adjusted for observable price changes for identical or similar investments of the same issuer. As of March 31, 2022 and December 31, 2021, the Company did not hold any non-marketable equity securities. No remeasurements or impairment losses were recorded on non-marketable equity securities during the three months ended March 31, 2022 and 2021.