Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Schedule of Differences between the Expected Income Tax Provision and Income Taxes Computed at the Federal Statutory Rate

The provision for income taxes differs from the amount expected by applying the federal statutory rate to the loss before taxes as follows:

	Year Ended December 31,
	2016			2015
Federal statutory income tax rate		34.00	%		34.00	%
State taxes (tax effected)		7.87	%		7.19	%
Non-deductible expenses and other		(10.19	)%		—	%
Research and development credits		14.07	%		2.98	%
Change in valuation allowance		(45.75	)%		(44.17	)%
Total		—			—

Components of Company's Deferred Tax Assets

As of December 31, 2016, and 2015, the components of the Company’s deferred tax assets are as follows (in thousands):

	As of December 31,
	2016			2015
Deferred tax assets:
Net operating loss carryforwards	$	23,937		$	14,830
Deferred Revenue		—			5,656
Start-up costs		2,093			2,260
Research and development credits carryforwards		4,450			2,157
Depreciation		(527	)		(565	)
Other		865			437
Total deferred tax assets		30,818			24,775
Less valuation allowance		(30,818	)		(24,775	)
Net deferred tax assets	$	—		$	—

Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):

	For the Year Ended December 31,
	2016		2015		2014
Beginning balance	$	719	$	465	$	56
Increases of unrecognized tax benefits related to current year		755		254		409
Ending balance	$	1,474	$	719	$	465