Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

Schedule of Estimated Stock-Based Compensation Expense

Stock-based compensation expense, net of estimated forfeitures, is reflected in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Operating Expenses
Research and development	$	1,501	$	1,020	$	2,982	$	1,604
General and administrative		2,157		1,995		4,540		3,773
Total	$	3,658	$	3,015	$	7,522	$	5,377