Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Employee Service Share-based Compensation Allocation

Total share-based compensation expense by statement of operations classification is presented below (in thousands):

	Three Months Ended March 31,
	2019		2018
Research and development expense	$	5,157	$	1,493
General and administrative expense	5,974		2,167
	$	11,131	$	3,660