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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018 and 2017 are as follows:

		Year Ended December 31,
		2018				2017
Tax at statutory federal rate			-21.00	%			-34.00	%
State Tax (benefit)—net of federal benefit			-0.03	%			0.00	%
Permanent differences			0.68	%			0.60	%
R&D credits			-0.76	%			-1.64	%
Derecognition due to Sec. 382 and 383 limitations			-20.16	%			54.08	%
Change in valuation allowance			39.33	%			-52.90	%
Federal tax rate change			0.00	%			33.89	%
Other			1.94	%			-0.03	%
Effective tax rate			—				—

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

Significant components of the Company’s deferred tax assets as of December 31, 2018 and 2017 consist of the following (in thousands):

		Year Ended December 31,
		2018				2017
Deferred tax assets:
Accruals and reserves		$	751			$	1,112
Net operating loss carry forwards			23,559				11,519
R&D tax credit carry forwards			3,772				3,545
Fixed and intangible assets			3				89
Valuation Allowance			(28,085	)			(16,265	)
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, 2017		$	1,539
Increase/(Decrease) of unrecognized tax benefits taken    in prior years			(126	)
Increase/(Decrease) of unrecognized tax benefits    related to current year			62
Ending Balance at December 31, 2017		$	1,475
Increase/(Decrease) of unrecognized tax benefits taken    in prior years			13
Increase/(Decrease) of unrecognized tax benefits    related to current year			85
Ending Balance at December 31, 2018		$	1,573

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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Tabular disclosure of the change in unrecognized tax benefits.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 55
-Paragraph 217
-URI http://asc.fasb.org/extlink&oid=109238393&loc=d3e36027-109320

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