Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Fair Value of Assets and Liabilities Measured on Recurring Basis

The following table presents the Company’s financial assets and liabilities measured at fair value on a recurring basis in the consolidated balance sheets (in millions):

	December 31, 2020
	Total Fair Value and Carrying Value on Balance Sheet		Fair Value Measurement Category
			Level 1		Level 2		Level 3
Assets:
Money market account	$	59.9	$	—	$	59.9	$	—
Certificate of deposit	$	2.8	$	—	$	2.8	$	—
Corporate bonds	$	25.2	$	—	$	25.2	$	—

	December 31, 2019
	Total Fair Value and Carrying Value on Balance Sheet		Fair Value Measurement Category
			Level 1		Level 2		Level 3
Assets:
Money market account	$	21.3	$	—	$	21.3	$	—
Certificate of deposit	$	6.1	$	—	$	6.1	$	—
Corporate bonds	$	85.6	$	—	$	85.6	$	—

Summary of Amortized Cost and Unrealized (Gains) Losses of Available for Sale Securities

As of December 31, 2020, the following table summarizes the amortized cost and the unrealized (gains) losses of the available for sale securities (in thousands):

	Certificates of Deposit				Corporate Bonds
	Amortized Cost		Unrealized gains (losses)		Amortized Cost		Unrealized gains (losses)
Due within a year	$	2,796	$	18	$	24,941	$	233
Due after one year through five years		-		-		-		-
Total	$	2,796	$	18	$	24,941	$	233