Components Of Companys Deferred Tax Asset (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets-non current
Accrued bonuses	$ 12	$ 0
Accrued vacation	15	17
Net operating loss (NOL) carryover	9,191	7,516
Technology licenses amortization	0	36
Research & development tax credits	1,780	1,542
Share based expense	310	387
Other	5	5
Fixed asset depreciation	50	15
Total deferred tax asset	11,363	9,518
Less: valuation allowance	(11,363)	(9,518)
Net deferred tax asset	0	0
Deferred tax liability- non current	0	0
Net deferred tax asset	$ 0	$ 0