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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock Options [Member] |  |  |
Number of Shares |  |  |
Outstanding | 6,679,581 | 5,757,305 |
Granted | 1,789,000 | 1,544,850 |
Exercised | (855,717) | (544,565) |
Forfeited | (56,475) | (78,009) |
Expired | (2,084) |  |
Outstanding | 7,554,305 | 6,679,581 | 5,757,305
Vested (exercisable) | 5,862,122 |  |
Expected to vest after (unexercisable) | 1,692,183 |  |
Weighted-Average Exercise Price/Share |  |  |
Outstanding | $ 7.14 | $ 5.16 |
Granted | 20.46 | 13.55 |
Exercised | 6.73 | 3.91 |
Forfeited | 13.39 | 10.66 |
Expired | 19.56 |  |
Outstanding | 10.29 | 7.14 | $ 5.16
Vested (exercisable) | 7.41 |  |
Expected to vest after (unexercisable) | $ 20.24 |  |
Weighted-Average Remaining Contractual Term (Years) |  |  |
Outstanding | 6 years 7 months 6 days |  |
Vested (exercisable) | 5 years 10 months 24 days |  |
Expected to vest after (unexercisable) | 9 years 2 months 12 days |  |
Aggregated Intrinsic Value |  |  |
Outstanding | $ 254,393,000 |  |
Vested (exercisable) | 213,769,400 |  |
Expected to vest after (unexercisable) | $ 40,623,600 |  |
Weighted-average fair value per share | $ 13.21 | $ 13.55 |
Warrants [Member] |  |  |
Number of Shares |  |  |
Outstanding | 1,001,028 | 2,049,534 |
Granted | 0 |  | 0
Exercised | (963,149) | (1,027,546) |
Expired | (37,879) | (20,960) |
Outstanding |  | 1,001,028 | 2,049,534
Weighted-Average Exercise Price/Share |  |  |
Outstanding | $ 3.83 | $ 4.03 |
Granted | 0 |  | $ 0
Exercised | 3.80 | 3.95 |
Expired | $ 4.58 | 17.78 |
Outstanding |  | $ 3.83 | $ 4.03
Weighted-Average Remaining Contractual Term (Years) |  |  |
Outstanding | 0 years |  |
Vested (exercisable) | 0 years |  |

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Term [Abstract]. + References No definition available. + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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