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Stockholders' Equity (Deficit) - Schedule of Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Stock Options  
Granted (in shares) 3,840,724
Weighted Average Remaining Contractual Term  
Outstanding 10 years
Common stock options  
Stock Options  
Beginning balance (in shares) 0
Granted (in shares) 3,840,724
Exercised (in shares) 0
Cancelled/forfeited (in shares) (582,923)
Ending balance (in shares) 3,257,801
Exercisable (in shares) 0
Weighted Average Exercise Price  
Beginning balance (in dollars per share) | $ / shares $ 0.00
Granted (in dollars per share) | $ / shares 11.68
Exercised (in dollars per share) | $ / shares 0.00
Cancelled/forfeited (in dollars per share) | $ / shares 9.98
Ending balance (in dollars per share) | $ / shares 11.99
Exercisable (in dollars per share) | $ / shares $ 0.00
Weighted Average Remaining Contractual Term  
Granted 9 years 3 months 29 days
Exercised 0 years
Cancelled/forfeited 9 years 7 days
Outstanding 9 years 3 months 4 days
Exercisable 0 years
Aggregate Intrinsic Value  
Beginning balance | $ $ 0
Granted | $ 8,632
Exercised | $ 0
Cancelled/forfeited | $ (1,513)
Ending balance | $ 7,119
Exercisable | $ $ 0