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Shareholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Employee Service Share-based Compensation Allocation
Total share-based compensation expense by statement of operations and comprehensive loss classification is presented below (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2020
 
2019
 
2020
 
2019
Research and development expense
$
11,457

 
$
6,611

 
$
23,305

 
$
11,768

General and administrative expense
9,330

 
5,978

 
19,049

 
11,952

 
$
20,787

 
$
12,589

 
$
42,354

 
$
23,720