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Stock-Based Compensation (Schedule of Stock Options Outstanding and Exercisable) (Details) - Stock Options [Member] | 12 Months Ended
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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

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- 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 + Details
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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=120381028&loc=d3e5070-113901 + Details
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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=120381028&loc=d3e5070-113901 + Details
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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=120381028&loc=d3e5070-113901 + Details
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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 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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