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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017 and 2016 are as follows:

		Year Ended December 31,
		2017				2016
Tax at statutory federal rate			-34.00	%			-34.00	%
State Tax (benefit)—net of federal benefit			0.00	%			-1.12	%
Permanent differences			0.60	%			-7.95	%
R&D credits			-1.64	%			-3.16	%
Derecognition due to Sec. 382 and 383 limitations			54.08	%			0.00	%
Change in valuation allowance			-52.90	%			46.66	%
Federal tax rate change			33.89	%			0.00	%
Other			-0.03	%			-0.43	%
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, 2017 and 2016 consist of the following (in thousands):

		Year Ended December 31,
		2017				2016
Deferred tax assets:
Accruals and reserves		$	1,112			$	1,137
Net operating loss carry forwards			11,519				25,944
R&D tax credit carry forwards			3,545				3,174
Fixed and intangible assets			89				114
Valuation Allowance			(16,265	)			(30,369	)
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, 2016		$	1,314
Increase/(Decrease) of unrecognized tax benefits taken    in prior years			6
Increase/(Decrease) of unrecognized tax benefits    related to current year			219
Ending Balance at December 31, 2016		$	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

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- References

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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- Definition

Tabular disclosure of the change in unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 55
-Paragraph 217
-URI http://asc.fasb.org/extlink&oid=96868398&loc=d3e36027-109320

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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