Effective Income Tax Rate Reconciliation, Return to Provision and Other, Amount

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Effective Income Tax Rate Reconciliation, Stock Warrant Liability, Amount

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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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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 income tax rates.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Income Taxes - Schedule of effective income tax rate reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. income tax at federal statutory rate									$ (2,611)	$ (6,276)	$ (10,329)
State income tax, net of federal benefits									(2,550)	(1,072)	(1,041)
Stock warrant liability									2,626	0	0
Share-based compensation									(21,236)	(615)	81
Research and development credits									(8)	(6)	(4)
Return to provision and other									0	29	0
Change in tax rates									73	668	11,783
Other									(98)	363	470
Change in valuation allowance									23,813	6,910	(955)
Provision for income tax	$ (12)	$ 0	$ 21	$ 0	$ 1	$ 0	$ 0	$ 0	$ 9	$ 1	$ 5