Provision for Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Schedule of Provision for Income Taxes Differs from Amount Expected by Applying Federal Statutory Rate to Loss Before Taxes

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,
	2020			2019			2018
Federal statutory income tax rate		21.00	%		21.00	%		21.00	%
Equity investment		4.15	%		0.00	%		0.00	%
Research and development credits		3.10	%		0.00	%		0.00	%
Change in valuation allowance		(27.35	)%		(19.65	)%		(19.46	)%
Non-deductible expenses and other		(0.90	)%		(1.35	)%		(1.54	)%
Total		0.00	%		0.00	%		0.00	%

Schedule of Components of Deferred Tax Assets

As of December 31, 2020 and 2019, the components of the Company’s deferred tax assets are as follows (in thousands):

	Year Ended December 31,
	2020			2019
Deferred tax assets:
Federal and state net operating loss carryforwards	$	54,526		$	30,049
Research and development credits carryforwards		11,209			8,077
Depreciation		9,068			6,052
Deferred Revenue		2,407			3,277
Lease liability		3,831			-
Other		5,890			2,965
Total deferred tax assets		86,931			50,420
Deferred tax liabilities:
Right-of-use assets		(2,704	)		-
Total deferred tax liabilities		(2,704	)		-
Less valuation allowance		(84,227	)		(50,420	)
Net deferred tax assets	$	-		$	-

Summary of Activity Related to Unrecognized Tax Benefits

The following table summarizes the activity related to our unrecognized tax benefits (in thousands):

	Year Ended December 31,
	2020			2019			2018
Beginning balance	$	2,165		$	1,084		$	622
Additions (decreases) for tax positions taken in a prior year		(258	)		(7	)		8
Additions for tax positions taken in current year		1,246			1,088			454
Ending balance	$	3,153		$	2,165		$	1,084