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Share-Based Compensation - Stock Options (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Stock Options, Outstanding [Roll Forward]  
Stock options outstanding, beginning balance (in shares) | shares 5,121
Granted (in shares) | shares 2,551
Exercised (in shares) | shares (403)
Forfeited (in shares) | shares (566)
Expired (in shares) | shares (805)
Stock options outstanding, ending balance (in shares) | shares 5,898
Stock options exercisable (in shares) | shares 2,172
Stock Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Stock options outstanding, beginning balance (in usd per share) | $ / shares $ 7.51
Granted (in usd per share) | $ / shares 6.90
Exercised (in usd per share) | $ / shares 5.08
Forfeited (in usd per share) | $ / shares 3.24
Expired (in usd per share) | $ / shares 13.37
Stock options outstanding, ending balance (in usd per share) | $ / shares 7.02
Stock options exercisable (in usd per share) | $ / shares $ 9.48
Stock options outstanding, Weighted Average Remaining Contractual Life (in years) 7 years 11 months 15 days
Stock options exercisable, Weighted Average Remaining Contractual Life (in years) 5 years 6 months 29 days
Stock options outstanding, Aggregate Intrinsic Value | $ $ 7,115
Stock options exercisable, Aggregate Intrinsic Value | $ $ 1,841