Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Reconciliation of Federal Statutory Income Tax Rate to Effective Tax Rate

A reconciliation of the federal statutory income tax rate to our effective tax rate is as follows:

	Percent of Income before Income Taxes
	2019		2018
Statutory federal income tax rate	21.0	%	21.0	%
State income taxes - net of federal tax benefit	0.9	%	0.9	%
Other permanent differences	(2.3	)%	(3.7	)%
Valuation allowances	(25.9	)%	(29.2	)%
Research and development - U.S.	6.3	%	11.0	%
Effective tax rate for the year	—	%	—	%

Components of Deferred Tax Assets

Significant components of our deferred tax assets are as follows (in thousands):

	December 31,
	2019			2018
Net operating loss carryforwards	$	48,182		$	38,813
Research and development credit carryforwards	12,797			9,979
Compensation expense	1,156			1,552
Other	903			1,166
Total deferred tax assets	63,038			51,510
Valuation allowance for deferred tax assets	(63,038		)	(51,510		)
Net deferred tax assets	$	—		$	—