Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax

The geographical distribution of loss before income taxes are summarized below (in thousands).

	December 31,
	2018			2017
United States	$	(11,830	)	$	(13,707	)
Foreign		(11	)		(17	)
Income (loss) before income taxes	$	(11,841	)	$	(13,724	)
Income (loss) resulting from discontinued operations	$	(1,494	)	$	(3,593	)
Taxes allocated to discontinued operations		—			—

Summary of Provision for Income Tax Benefit

The components of the provision for income tax benefit follows (in thousands).

	December 31,
	2018		2017
Current:
Federal	$	—	$	—
State		—		1
Foreign		—		—
		—		1
Deferred
Federal		—		(1,578	)
State		—		(73	)
Foreign		—		—
		—		(1,651	)
Total provision for income taxes benefit	$	—	$	(1,650	)

Provision for Income Tax Benefit by Applying Statutory Federal Income Tax Rate to Operating Loss from Continuing Operations

The provision for income tax benefit differs from the amount estimated by applying the statutory federal income tax rate to the operating loss from continuing operations due to the following (in thousands).

	December 31,
	2018			2017
Tax on the loss before income tax expense computed    at the federal statutory rate	$	(2,486	)	$	(4,666	)
State tax (benefit) at statutory rate, net of federal    benefit		(187	)		(67	)
Tax reform		—			10,613
Foreign rate differential		2			3
Change in valuation allowance		4,143			(8,485	)
Change in research and development credits		(99	)		(121	)
Stock based compensation—ISOs		143			295
Change in fair value of warrants		(110	)		343
Change in fair value of contingent consideration		119			—
Gain on deconsolidation		(4	)		—
Disallowance of loss on discontinued operations		(426	)		—
Acquisition costs		—			203
Change in NOL true up		(590	)		—
Change in temporary difference true up		(456	)		—
Loss on sale of NFI		—			(677	)
Other		(49	)		909
Provision for income tax benefit	$	—		$	(1,650	)

Significant Components of Company's Deferred Tax Assets and Liabilities

Significant components of the Company’s deferred tax assets and liabilities are as follows at December 31, 2018 and 2017 (in thousands).

	December 31,
	2018			2017
Non-Current Deferred Tax Assets:
Federal and state net operating loss carryforwards	$	28,532		$	25,486
Research and other credits		2,037			1,807
Reserves and accruals		52			145
Assets held for sale		15			17
Fixed assets		67			—
Capital loss carryover		425			459
Stock based compensation		70			36
Other deferred tax assets		542			—
Gross non-current deferred tax assets		31,740			27,950
Intangible Assets		(4,062	)		(4,414	)
Fixed Assets		—			(3	)
Total non-current deferred tax liabilities		(4,062	)		(4,417	)
Total deferred tax assets		27,678			23,533
Valuation allowance		(27,678	)		(23,533	)
Net deferred tax assets	$	—		$	—

Summary of Gross Unrecognized Tax Benefits

The following tables summarize the activities of gross unrecognized tax benefits (in thousands).

	December 31,
	2018		2017
Beginning balance	$	854	$	795
Increases (decreases) related to prior year tax positions		23		(4	)
Increase related to current year tax positions		87		63
Ending Balance	$	964	$	854