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Equity Incentive Plans - Summary of Restricted Stock Activity (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Restricted Stock Units Outstanding, Nonvested, beginning 7,482,032 1,305,421  
Number of Restricted Stock Units Outstanding, Granted 0 8,673,584 1,305,421
Number of Restricted Stock Units Outstanding, Vested (2,833,506) (2,369,696)  
Number of Restricted Stock Units Outstanding, Forfeited   (127,277)  
Number of Restricted Stock Units Outstanding, Nonvested, ending 4,648,526 7,482,032 1,305,421
Weighted-Average Grant Date Fair Value, Nonvested $ 4.01 $ 0.09  
Weighted-Average Grant Date Fair Value, Granted   5.53 $ 0.09
Weighted-Average Grant Date Fair Value, Vested 4.05 7.58  
Weighted-Average Grant Date Fair Value, Forfeited   0.09  
Weighted-Average Grant Date Fair Value, Nonvested $ 3.98 $ 4.01 $ 0.09