Income Taxes - Provision for Income Tax Benefit by Applying Statutory Federal Income Tax Rate to Operating Loss from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Tax on the loss before income tax expense computed at the federal statutory rate	$ (6,463)	$ (2,486)
State tax (benefit) at statutory rate, net of federal benefit	(1,691)	(187)
Foreign rate differential	10	2
Change in valuation allowance	6,696	4,143
Change in research and development credits	(200)	(99)
Stock based compensation—ISOs	149	143
Change in fair value of warrants	1,461	(110)
Change in fair value of contingent consideration	61	119
Gain on deconsolidation		(4)
Disallowance of loss on discontinued operations		(426)
Change in net operating loss true up	(725)	(590)
Change in state rate true up	701
Change in temporary difference true up		(456)
Other	$ 1	$ (49)