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Stockholders' Equity Summary of RSU Activity Under Equity Incentive Plan (Details) - Restricted stock units
12 Months Ended
Dec. 31, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Beginning balance (shares) 1,688,017
Granted (shares) 1,491,771
Vested (shares) (1,003,218)
Cancelled (shares) (106,634)
Ending balance (shares) 2,069,936