Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2014

Accounting Policies [Abstract]

Schedule of Estimated Stock-Based Compensation Expense

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

									Cumulative
									Period From
									December 10,
									2008  (Date of
	Three Months Ended				Nine Months Ended				Inception) to
	September 30,				September 30,				September 30,
	2014		2013		2014		2013		2014
Operating Expenses
Research and development	$	394	$	34	$	761	$	88	$	1,130
General and administrative		1,162		21		2,288		56		2,470
Total	$	1,556	$	55	$	3,049	$	144	$	3,600