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Stock-Based Compensation - Schedule of Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock Units    
Beginning balance 1,494,111  
Granted 300,003 1,502,666
Vested and released (1,206,743)  
Forfeited (315,899) (8,555)
Ending balance 271,472 1,494,111
Weighted Average Grant Date Fair Value    
Beginning balance $ 26.91  
Granted 3.95 $ 26.86
Vested and released 27.93  
Forfeited 19.91 16.99
Ending balance $ 5.15 $ 26.91