Consolidated Financial Statement Components (Tables)

12 Months Ended

Dec. 31, 2016

Supplemental Balance Sheet Information [Abstract]

Summary of Depreciation, Amortization and Accretion

Depreciation, amortization and accretion consisted of the following for the periods stated:

	For the Year Ended December 31,
(Dollars in thousands)	2016			2015			2014
Depreciation
Leasehold improvements	$	189		$	233		$	194
Asset retirement costs	(277		)	(505		)	(289		)
Paging and computer equipment	7,974			8,489			9,370
Furniture, fixtures and vehicles	294			353			925
Total depreciation	8,180			8,570			10,200
Amortization	4,160			4,735			5,722
Accretion	623			665			755
Total depreciation, amortization and accretion expense	$	12,963		$	13,970		$	16,677

Property, Plant and Equipment

Property and equipment, net consisted of the following for the periods stated:

	Useful Life (In Years)	For the Year Ended December 31,
(Dollars in thousands)		2016			2015
Leasehold improvements	lease term	$	3,843		$	3,699
Asset retirement costs	1-5	3,263			3,566
Paging and computer equipment	1-5	113,175			114,390
Furniture, fixtures and vehicles	3-5	2,852			2,648
Total property and equipment		123,133			124,303
Accumulated depreciation		(110,315		)	(108,917		)
Total property and equipment, net		$	12,818		$	15,386

Components of Other Liabilities

Other current liabilities consisted of the following for the periods stated:

	December 31,
(Dollars in thousands)	2016		2015
Accrued outside services	$	975	$	1,455
Accrued network costs	773		917
Accrued accounting and legal	467		458
Accrued recognition awards	299		370
Deferred rent and other	134		165
Asset retirement obligations	85		296
Total other current liabilities	$	2,733	$	3,661

Summary of Other Long-Term Liabilities

Other non-current liabilities consisted of the following for the periods stated:

	December 31,
(Dollars in thousands)	2016		2015
Asset retirement obligations	$	7,472	$	7,543
Deferred rent and other	942		1,269
Dividends payable	507		160
Total other non-current liabilities	$	8,921	$	8,972