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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Reconciliation of Federal Income Tax Rate to Company's Effective Tax Rate

The reconciliation of the federal statutory income tax rate to the Company’s effective tax rate for the years ended December 31, 2020 and 2019 are as follows:

		Year Ended December 31,
		2020				2019
Tax at statutory federal rate			-21.00	%			-21.00	%
State Tax (benefit)—net of federal benefit			0.00	%			-0.06	%
Permanent differences			0.58	%			0.43	%
Tax credits			-12.26	%			-11.20	%
Derecognition due to Sec. 382 and 383 limitations			44.55	%			0.00	%
Change in valuation allowance			-12.25	%			31.20	%
Other			0.38	%			0.63	%
Effective tax rate			0.00	%			0.00	%

Components of the Company's Deferred Tax Assets (Liabilities)

Significant components of the Company’s deferred tax assets as of December 31, 2020 and 2019 consist of the following (in thousands):

		Year Ended December 31,
		2020				2019
Deferred tax assets:
Accruals and reserves		$	1,095			$	936
Net operating loss carry forwards			29,505				34,392
Tax credit carry forwards			7,789				9,945
Fixed and intangible assets			7				10
Valuation allowance			(38,396	)			(45,283	)
Net deferred tax assets:		$	—			$	—

Unrecognized Tax Benefits

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

Beginning Balance at January 1, 2019		$	1,573
Increase/(Decrease) of unrecognized tax benefits taken    in prior years			45
Increase/(Decrease) of unrecognized tax benefits    related to current year			253
Ending Balance at December 31, 2019		$	1,871
Increase/(Decrease) of unrecognized tax benefits taken    in prior years			(295	)
Increase/(Decrease) of unrecognized tax benefits    related to current year			1,379
Ending Balance at December 31, 2020		$	2,955

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of the change in unrecognized tax benefits.

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