Components Of Companys Deferred Tax Asset (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets-non current
Accrued bonuses	$ 0	$ 77
Accrued vacation	32	22
Net operating loss (NOL) carryover	9,166	6,641
Technology licenses amortization	60	64
Research & development tax credits	1,259	877
Share based expense	443	293
Other	9	(10)
Total deferred tax asset	10,969	7,964
Less: valuation allowance	(10,965)	(7,964)
Net deferred tax asset	4	0
Deferred tax liability- non current	(4)	0
Net deferred tax asset	$ 0	$ 0