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Cash and Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cash, cash equivalents and investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 102,390	$ 62,904
Gross unrealized gains	3
Gross unrealized losses	(39)	(32)
Fair value	102,354	62,872
Cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	18,844	16,507
Fair value	18,844	16,507
Cash and money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	18,844	14,858
Fair value	18,844	14,858
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost		1,649
Fair value		1,649
Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	83,546	46,397
Gross unrealized gains	3
Gross unrealized losses	(39)	(32)
Fair value	83,510	46,365
Commercial paper, not included with cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	53,493	20,408
Gross unrealized losses	(24)	(14)
Fair value	53,469	20,394
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	10,223	9,043
Gross unrealized gains	3
Gross unrealized losses	(12)	(9)
Fair value	10,214	9,034
U.S. government and agency securities, not included with cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	19,830	16,946
Gross unrealized losses	(3)	(9)
Fair value	19,827	16,937
Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	4,500	4,500
Fair value	$ 4,500	$ 4,500

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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.

+ References

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

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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