Details of Selected Balance Sheet Accounts (Tables)

3 Months Ended

Mar. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Inventories

Inventories

The following table is a summary of inventories (in thousands):	March 31, 2017			December 31, 2016
Raw materials and subassemblies	$	20,609		$	21,454
Work-in-process	1,999			2,255
Finished goods	7,634			6,581
Reserve for excess and obsolete inventories	(15,022		)	(15,049		)
Total	$	15,220		$	15,241

Summary of Other Long-term Liabilities

Other Long-term Liabilities

The following table is a summary of other long-term liabilities (in thousands):	March 31, 2017		December 31, 2016
Deferred rents	13,684		13,955
Facility restructuring accrual	1,434		1,765
Deferred income tax liability	1,774		3,679
Other long-term liabilities	1,134		1,128
Total	$	18,026	$	20,527