Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Taxes [Abstract]

Components Of Deferred Tax Assets

	December 31,
	2016		2015
Technology	$	(1,449)	$	(1,630)
Temporary differences		312		103
Credits		639		198
Net operating loss carryforwards		5,121		1,590
Total deferred tax assets		4,623		261
Valuation allowance		(4,623)		(261)
Net deferred tax assets	$	—	$	—

Reconcilement Of Tax Rates

					May 19, 2014
					(inception)
	Years Ended				through
	December 31,				December 31,
	2016		2015		2014
U.S. federal statutory tax rate	(35.0)	%	(35.0)	%	(35.0)	%
Valuation allowance	42.0	%	4.0	%	16.0	%
Permanent differences	2.0	%	1.0	%	15.0	%
State tax benefit and other	(9.0)	%	(7.0)	%	(4.0)	%
Effective tax rate	—	%	(37.0)	%	(8.0)	%

Reconciliation Of Unrecognized Tax Benefit Accounts

	December 31,
	2016		2015
Balance, January 1, 2016	$	66	$	—
Gross increases - tax positions in prior periods		—		—
Gross decreases - tax positions in prior periods		—		—
Gross increases - tax position in current period		147		66
Settlements		—		—
Lapses in statutes of limitations		—		—
Balance, December 31, 2016	$	213	$	66