Consolidated Financial Statement Components (Tables)

3 Months Ended

Mar. 31, 2018

Supplemental Financial Statement Components [Abstract]

Summary of Depreciation, Amortization and Accretion

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

	For the Three Months Ended March 31,
(Dollars in thousands)	2018			2017
Depreciation
Leasehold improvements	$	68		$	50
Asset retirement costs	(76		)	(98		)
Paging and computer equipment	1,855			2,044
Furniture, fixtures and vehicles	106			80
Total depreciation	1,953			2,076
Amortization	625			1,007
Accretion	135			140
Total depreciation, amortization and accretion expense	$	2,713		$	3,223

Property, Plant and Equipment

Property and equipment, net consisted of the following as of the date stated:

(Dollars in thousands)	Useful Life (In Years)	March 31, 2018			December 31, 2017
Leasehold improvements	shorter of useful life or lease term	$	4,135		$	4,107
Asset retirement costs	1-5	3,243			3,228
Paging and computer equipment	1-5	102,221			103,520
Furniture, fixtures and vehicles	3-5	4,570			4,545
Total property and equipment		114,169			115,400
Accumulated depreciation		(101,547		)	(102,001		)
Total property and equipment, net		$	12,622		$	13,399

Components of Other Current Liabilities

Other current liabilities consisted of the following as of the date stated:

(Dollars in thousands)	March 31, 2018		December 31, 2017
Accrued network costs, asset retirement obligations and other	$	3,055	$	2,173
Accrued outside services	1,400		2,437
Total other current liabilities	$	4,455	$	4,610

Summary of Other Non-Current Liabilities

Other non-current liabilities consisted of the following as of the date stated:

(Dollars in thousands)	March 31, 2018		December 31, 2017
Asset retirement obligations	$	7,266	$	7,174
Other	1,016		901
Total other non-current liabilities	$	8,282	$	8,075