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Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 208,432	$ 49,094
Gross unrealized gains	133	6
Gross unrealized losses	(15)	(1)
Fair value	208,550	49,099
Cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	69,027	29,627
Gross unrealized gains	1
Gross unrealized losses
Fair value	69,028	29,627
Cash and money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	41,784	18,644
Gross unrealized gains
Gross unrealized losses
Fair value	41,784	18,644
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	24,243	10,983
Gross unrealized gains	1
Gross unrealized losses
Fair value	24,244	10,983
U.S. government and agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	10,097
Gross unrealized gains	1
Gross unrealized losses	(1)
Fair value	10,097
U.S. Treasury security [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	3,000
Gross unrealized gains
Gross unrealized losses
Fair value	3,000
Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	139,405	19,467
Gross unrealized gains	132	6
Gross unrealized losses	(15)	(1)
Fair value	139,522	19,472
Commercial paper, not included with cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	105,377	16,971
Gross unrealized gains	12	1
Gross unrealized losses	(9)	(1)
Fair value	105,380	16,971
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	21,081	2,496
Gross unrealized gains	119	5
Gross unrealized losses	(5)
Fair value	21,195	2,501
U.S. Treasury security, not included with cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	2,850
Gross unrealized gains
Gross unrealized losses
Fair value	2,850
Long-term restricted cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	3,500	4,000
Gross unrealized gains
Gross unrealized losses
Fair value	$ 3,500	$ 4,000

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