Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Reconciliation of Federal Income Tax Rate to Losses Before Income Tax Benefit

The reasons for the difference between actual income tax benefit for the years ended December 31, 2019 and 2018, and the amount computed by applying the statutory federal income tax rate to losses before income tax benefit are as follows:



	Year Ended December 31,
	2019			2018
				(Restated)
Income tax benefit at federal statutory rate	$	(6,379	)	$	(6,140	)
State income taxes, net of federal benefit	(582		)	(570		)
Non-deductible expenses	193			154
Federal rate impact	—			—
Research and development tax credits	(1,225		)	(1,254		)
Other	330			380
Change in valuation allowance	7,663			7,430
Total income tax provision	$	—		$	—

Significant Components of Company's Deferred Tax Assets and Deferred Tax Liabilities

Significant components of the Company’s deferred tax assets and deferred tax liabilities are as follows:



	As of December 31,
	2019			2018
Deferred tax assets:
Accrued compensation	$	13		$	184
Accrued liabilities	235			149
Tax loss carryforwards	38,042			37,986
Intangible assets	268			286
Share-based compensation	666			814
Tax credits	8,141			6,917
Facility financing lease obligation	—			1,847
Research and development service obligation	6,620			—
Right-of-use lease liabilities	1,436			—
Deferred revenue	572			588
Other	54			10
Total deferred tax assets	56,047			48,781
Less valuation allowance	(54,430		)	(46,604		)
Net deferred tax asset	1,617			2,177
Deferred tax liabilities:
Fixed assets	(1,014		)	(2,032		)
Right-of-use lease assets	(421		)	—
Other	(182		)	(145		)
Net noncurrent deferred tax asset (liability)	$	—		$	—