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Income Taxes - Income Tax Benefit Attributable to Our Loss from Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. federal income tax benefit at statutory rates	$ (1,666)	$ (6,286)
State income tax benefit, net of federal benefit	(290)	(565)
Research and experimentation credits	(144)	(303)
Change in tax rate		20,085
Deferred tax asset adjustment	34	37
Other	134	122
Change in valuation allowance	1,901	(13,151)
Income tax benefit	$ (31)	$ (61)

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Adjustment of the carrying value of deferred tax assets during the year.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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