Deferred Revenue and Income (Tables)

12 Months Ended

Dec. 31, 2017

Deferred Revenue Disclosure [Abstract]

Deferred Revenue and Income Summary

A summary of the balances as of December 31, follows (in thousands):

	2017		2016
Products and services not yet delivered	71		35
Arizona Commerce Authority grant	1,000		—
Total current deferred revenue and income	$	1,071	$	35
Arizona Commerce Authority grant	$	—	$	1,000
Total long-term deferred income	$	—	$	1,000