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Share-Based Compensation - Stock Options (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Stock Options, Outstanding [Roll Forward]  
Stock options outstanding, beginning balance (in shares) | shares 5,898
Granted (in shares) | shares 2,857
Exercised (in shares) | shares (48)
Forfeited (in shares) | shares (234)
Expired (in shares) | shares (70)
Stock options outstanding, ending balance (in shares) | shares 8,403
Stock options exercisable (in shares) | shares 3,256
Stock Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Stock options outstanding, beginning balance (in usd per share) | $ / shares $ 7.02
Granted (in usd per share) | $ / shares 8.20
Exercised (in usd per share) | $ / shares 3.54
Forfeited (in usd per share) | $ / shares 7.13
Expired (in usd per share) | $ / shares 12.62
Stock options outstanding, ending balance (in usd per share) | $ / shares 7.39
Stock options exercisable (in usd per share) | $ / shares $ 7.88
Stock options outstanding, Weighted Average Remaining Contractual Life (in years) 7 years 9 months 29 days
Stock options exercisable, Weighted Average Remaining Contractual Life (in years) 5 years 10 months 17 days
Stock options outstanding, Aggregate Intrinsic Value | $ $ 12,204
Stock options exercisable, Aggregate Intrinsic Value | $ $ 6,291