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Stock-Based Compensation (Schedule of Stock Options Outstanding and Exercisable) (Details) - Stock Options [Member]	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Number Outstanding	7,554,305
Number Exercisable	5,862,122
$1.08 - 3.07 [Member]
Number Outstanding	894,024
Weighted-Average Remaining Contractual Life (Years)	4 years 8 months 12 days
Weighted-Average Exercise Price | $ / shares	$ 2.25
Number Exercisable	894,024
Weighted-Average Exercise Price | $ / shares	$ 2.25
$3.19 - 3.44 [Member]
Number Outstanding	839,001
Weighted-Average Remaining Contractual Life (Years)	4 years 6 months
Weighted-Average Exercise Price | $ / shares	$ 3.30
Number Exercisable	839,001
Weighted-Average Exercise Price | $ / shares	$ 3.30
$4.56 - 4.92 [Member]
Number Outstanding	658,437
Weighted-Average Remaining Contractual Life (Years)	4 years 6 months
Weighted-Average Exercise Price | $ / shares	$ 4.80
Number Exercisable	658,437
Weighted-Average Exercise Price | $ / shares	$ 4.80
$5.00 - 7.67 [Member]
Number Outstanding	769,694
Weighted-Average Remaining Contractual Life (Years)	4 years 7 months 6 days
Weighted-Average Exercise Price | $ / shares	$ 5.04
Number Exercisable	769,694
Weighted-Average Exercise Price | $ / shares	$ 5.04
$7.80 - 8.65 [Member]
Number Outstanding	961,979
Weighted-Average Remaining Contractual Life (Years)	6 years
Weighted-Average Exercise Price | $ / shares	$ 8.28
Number Exercisable	952,229
Weighted-Average Exercise Price | $ / shares	$ 8.28
$9.29 - 12.79 [Member]
Number Outstanding	1,153,291
Weighted-Average Remaining Contractual Life (Years)	8 years
Weighted-Average Exercise Price | $ / shares	$ 11.85
Number Exercisable	1,083,688
Weighted-Average Exercise Price | $ / shares	$ 11.84
$13.37 - 16.95 [Member]
Number Outstanding	1,598,304
Weighted-Average Remaining Contractual Life (Years)	9 years
Weighted-Average Exercise Price | $ / shares	$ 16.41
Number Exercisable	498,801
Weighted-Average Exercise Price | $ / shares	$ 15.73
$17.36 - 55.48 [Member]
Number Outstanding	679,575
Weighted-Average Remaining Contractual Life (Years)	9 years 3 months 18 days
Weighted-Average Exercise Price | $ / shares	$ 26.54
Number Exercisable	166,248
Weighted-Average Exercise Price | $ / shares	$ 18.53

X

- Definition

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.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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X

- 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=120381028&loc=d3e5070-113901

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X

- 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=120381028&loc=d3e5070-113901

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X

- 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=120381028&loc=d3e5070-113901

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X

- 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=120381028&loc=d3e5070-113901

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