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Share-Based Compensation - Summary of Outstanding RSU Awards Granted (Details) - Restricted stock units
shares in Thousands
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Restricted Stock Units  
Outstanding, beginning balance (in shares) | shares 1,958
Awarded (in shares) | shares 201
Vested (in shares) | shares (98)
Forfeited (in shares) | shares (108)
Outstanding, ending balance (in shares) | shares 1,953
Outstanding, expected to vest (in shares) | shares 1,795
Weighted Average Grant-Date Fair Value  
Outstanding, beginning balance (in dollars per share) | $ / shares $ 6.95
Awarded (in dollars per share) | $ / shares 6.57
Vested (in dollars per share) | $ / shares 3.31
Forfeited (in dollars per share) | $ / shares 36.14
Outstanding, ending balance (in dollars per share) | $ / shares 5.48
Outstanding, expected to vest (in dollars per share) | $ / shares $ 5.48