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Stock-Based Compensation - Outstanding Stock-based Compensation Awards (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 11, 2020 | Oct. 15, 2020 | Dec. 03, 2019 | Nov. 18, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Number of Stock Option Awards |  |  |  |  |  |  |
Beginning balance outstanding stock options (in shares) |  |  |  |  | 4,278,160 | 5,875,829 |
Stock options granted during period (in shares) | 482,000 | 388,892 | 5,556 | 2,549,552 | 0 | 872,003 |
Exercises (net cash settled) (in shares) |  |  |  |  | 0 | (130,017) |
Exercises (issuance of shares) |  |  |  |  | (446,344) | (2,143,317) |
Forfeitures/expirations (in shares) |  |  |  |  | (98,002) | (196,338) |
Ending balance outstanding stock options (in shares) |  |  |  |  | 3,733,814 | 4,278,160 | 5,875,829
Options exercisable (in shares) |  |  |  |  | 1,293,492 | 992,061 |
Weighted- Average Exercise Price |  |  |  |  |  |  |
Beginning balance (in dollars per share) |  |  |  |  | $ 11.20 | $ 9.29 |
Granted (in dollars per share) | $ 10.35 | $ 13.82 | $ 16.20 | $ 16.20 | 0 | 11.90 |
Exercises (in dollars per share) |  |  |  |  | 0 | 3.68 |
Exercises (issuance of shares) |  |  |  |  | 7.69 | 3.69 |
Forfeitures/expirations (in dollars per share) |  |  |  |  | 13.01 | 13.22 |
Ending balance (in dollars per share) |  |  |  |  | 11.59 | 11.20 | $ 9.29
Options exercisable (in dollars per share) |  |  |  |  | $ 8.61 | $ 4.28 |
Weighted- Average Remaining Contractual Term (years) |  |  |  |  |  |  |
Outstanding |  |  |  |  | 7 years 6 months 7 days | 8 years 4 months 9 days | 8 years 1 month 24 days
Granted |  |  |  |  |  | 9 years 10 months 13 days |
Exercises (net cash settled) |  |  |  |  |  | 5 years 8 months 26 days |
Exercises (issuance of shares) |  |  |  |  | 5 years 10 months 28 days | 5 years 9 months 7 days |
Forfeitures/expirations |  |  |  |  | 8 years 6 months 7 days | 8 years 7 months 20 days |
Options exercisable |  |  |  |  | 6 years 9 months 10 days | 5 years 9 months 21 days |
Aggregate Intrinsic Value (in thousands) |  |  |  |  |  |  |
Outstanding stock option awards at January 1 |  |  |  |  | $ 9,855 | $ 42,434 |
Granted |  |  |  |  | 0 | 1,393 |
Exercises (net cash settled) |  |  |  |  | 0 | 896 |
Exercises (issuance of shares) |  |  |  |  | 8,459 | 15,511 |
Forfeitures/expirations |  |  |  |  | 2,078 | (146) |
Outstanding stock option awards at period end |  |  |  |  | 110,298 | 9,855 | $ 42,434
Options exercisable as of December 31 |  |  |  |  | $ 42,060 | $ 9,151 |

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- Definition For presentations that combine terminations, 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 or that expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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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