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Financial Instruments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Cash, cash equivalents and investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 318,729	$ 49,094
Gross unrealized gains	106	6
Gross unrealized losses	(21)	(1)
Fair value	318,814	49,099
Cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	81,612	29,627
Gross unrealized losses	(1)
Fair value	81,611	29,627
Cash and money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	43,040	18,644
Fair value	43,040	18,644
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	32,538	10,983
Gross unrealized losses	(1)
Fair value	32,537	10,983
U.S. government and agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	170
Fair value	170
U.S. Treasury security [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	5,864
Fair value	5,864
Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	237,117	19,467
Gross unrealized gains	106	6
Gross unrealized losses	(20)	(1)
Fair value	237,203	19,472
Commercial paper, not included with cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	112,648	16,971
Gross unrealized gains	4	1
Gross unrealized losses	(8)	(1)
Fair value	112,644	16,971
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	17,360	2,496
Gross unrealized gains	96	5
Fair value	17,456	2,501
U.S. government & agency securities, not included with cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	107,109
Gross unrealized gains	6
Gross unrealized losses	(12)
Fair value	107,103
Short-Term Restricted Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	836	300
Fair value	836	300
Long-term restricted cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	3,500	4,000
Fair value	$ 3,500	$ 4,000

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- Definition

Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

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