Stock-Based Compensation (Schedule of Stock Options Outstanding and Exercisable) (Details) - Stock Options [Member]	12 Months Ended
Dec. 31, 2019 $ / shares shares
Number Outstanding	6,679,581
Number Exercisable	5,895,891
$1.08 - 2.66 [Member]
Number Outstanding	1,059,176
Weighted-Average Remaining Contractual Life (Years)	5 years 9 months 18 days
Weighted-Average Exercise Price \| $ / shares	$ 2.27
Number Exercisable	1,059,176
Weighted-Average Exercise Price \| $ / shares	$ 2.27
$3.00 - 3.44 [Member]
Number Outstanding	977,670
Weighted-Average Remaining Contractual Life (Years)	5 years 8 months 12 days
Weighted-Average Exercise Price \| $ / shares	$ 3.30
Number Exercisable	977,670
Weighted-Average Exercise Price \| $ / shares	$ 3.30
$4.56 - 4.92 [Member]
Number Outstanding	768,358
Weighted-Average Remaining Contractual Life (Years)	5 years 4 months 24 days
Weighted-Average Exercise Price \| $ / shares	$ 4.77
Number Exercisable	768,358
Weighted-Average Exercise Price \| $ / shares	$ 4.77
$5.00 - 6.65 [Member]
Number Outstanding	855,328
Weighted-Average Remaining Contractual Life (Years)	5 years 7 months 6 days
Weighted-Average Exercise Price \| $ / shares	$ 5.04
Number Exercisable	854,803
Weighted-Average Exercise Price \| $ / shares	$ 5.04
$7.67 - 7.89 [Member]
Number Outstanding	1,180,040
Weighted-Average Remaining Contractual Life (Years)	7 years 2 months 12 days
Weighted-Average Exercise Price \| $ / shares	$ 8.32
Number Exercisable	1,109,650
Weighted-Average Exercise Price \| $ / shares	$ 8.30
$8.17 - 8.65 [Member]
Number Outstanding	1,271,242
Weighted-Average Remaining Contractual Life (Years)	9 years
Weighted-Average Exercise Price \| $ / shares	$ 11.90
Number Exercisable	910,178
Weighted-Average Exercise Price \| $ / shares	$ 11.74
Range Seven [Member]
Number Outstanding	567,767
Weighted-Average Remaining Contractual Life (Years)	9 years 4 months 24 days
Weighted-Average Exercise Price \| $ / shares	$ 16.05
Number Exercisable	216,056
Weighted-Average Exercise Price \| $ / shares	$ 15.56

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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