Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies [Abstract]

Future Minimum Payments Under Capital Leases

The following is a schedule by years of future minimum payments under capital leases together with the present value of the net minimum lease payments as of December 31, 2017 (in thousands):

	Property			Equipment			Total
2018	$	1,947		$	1		$	1,948
2019		1,995			1			1,996
2020		2,045			1			2,046
2021		2,097			2			2,099
2022		2,149			--			2,149
Remainder		15,118			--			15,118
Total minimum obligations		25,351			5			25,356
Less amounts representing interest (ranging from 5.0% to 21.8%)		(6,361	)		(2	)		(6,363	)
Net present value of minimum obligations		18,990			3			18,993
Less current portion		(1,012	)		(1	)		(1,013	)
Long-term capital lease obligations at December 31, 2017	$	17,978		$	2		$	17,980

Future Minimum Lease Payments for All Noncancelable Operating Leases

Future minimum lease payments for all noncancelable operating leases at December 31, 2017 are as follows (in thousands):

2018	$	516
2019		494
2020		507
2021		503
2022		366
Remainder		354
Total minimum lease payments	$	2,740

Accrued Warranties

We provide product warranties for products sold through certain U.S. Government contract vehicles. We accrue a warranty liability at the time that we recognize revenue for the estimated costs that may be incurred in connection with providing warranty coverage. Warranties are valued using historical warranty usage trends; however, if actual product failure rates or service delivery costs differ from estimates, revisions to the estimated warranty liability may be required. Accrued warranties are reported as other current liabilities on the consolidated balance sheets.

	Balance Beginning of Year		Accruals		Warranty Expenses			Balance End of Year
	(amount in thousands)
Year Ended December 31, 2017	$	51	$	--	$	(21	)	$	30
Year Ended December 31, 2016	$	133	$	279	$	(361	)	$	51
Year Ended December 31, 2015	$	189	$	125	$	(181	)	$	133