Spok (SPOK) 10-Q 28 Apr 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 22, 2016
Document Document And Entity Information [Abstract]
Entity Registrant Name	Spok Holdings, Inc
Entity Central Index Key	1,289,945
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		20,604,436

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 111,921	$ 111,332
Accounts receivable (less allowances of $1,277 and $1,286, respectively)	21,078	22,638
Prepaid expenses and other	4,858	5,352
Inventory	1,986	2,291
Total current assets	139,843	141,613
Property and equipment, net	14,806	15,386
Goodwill	133,031	133,031
Other intangible assets, net	13,853	14,964
Deferred income tax assets (less valuation allowance of $45,848 and $45,777, respectively)	81,659	83,983
Other assets	1,547	1,445
TOTAL ASSETS	384,739	390,422
Current liabilities:
Accounts payable and accrued liabilities	7,804	9,247
Accrued compensation and benefits	9,837	10,864
Deferred revenue	27,415	27,045
Total current liabilities	45,056	47,156
Deferred revenue	738	741
Other long-term liabilities	8,854	8,972
TOTAL LIABILITIES	$ 54,648	$ 56,869
Commitments and contingencies
Stockholders’ equity:
Preferred stock	$ 0	$ 0
Common stock	2	2
Additional paid-in capital	106,234	110,435
Retained earnings	223,855	223,116
TOTAL STOCKHOLDERS’ EQUITY	330,091	333,553
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 384,739	$ 390,422

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets Additional Information - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,277	$ 1,286
Deferred tax asset valuation allowance	$ 45,848	$ 45,777

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue:
Wireless	$ 28,172	$ 30,690
Software	17,216	17,448
Total revenue	45,388	48,138
Operating expenses:
Cost of revenue	8,017	8,813
Service, rental and maintenance	11,213	11,256
Selling and marketing	6,529	7,048
General and administrative	10,510	11,001
Severance	(4)	0
Depreciation, amortization and accretion	3,323	3,747
Total operating expenses	39,588	41,865
Operating income	5,800	6,273
Interest income (expense), net	49	(1)
Other income (expense), net	254	60
Income before income tax expense	6,103	6,332
Income tax expense	(2,659)	(2,415)
Net income	$ 3,444	$ 3,917
Basic net income per common share (usd per share)	$ 0.17	$ 0.18
Diluted net income per common share (usd per share)	$ 0.17	$ 0.18
Basic weighted average common shares outstanding (shares)	20,683,719	21,898,792
Diluted weighted average common shares outstanding (shares)	20,845,661	22,053,015
Cash dividends declared per common share (usd per share)	$ 0.125	$ 0.125

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 3,444	$ 3,917
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	3,323	3,747
Deferred income tax expense	2,327	1,997
Amortization of stock based compensation	637	443
Provision for doubtful accounts, service credits and other	238	327
Adjustment of non-cash transaction taxes	(81)	(49)
(Gain) Loss on disposals of property and equipment	0	(18)
Changes in assets and liabilities:
Accounts receivable	1,322	1,268
Prepaid expenses and other assets	595	54
Accounts payable, accrued liabilities and accrued compensation and benefits	(2,667)	(5,791)
Deferred revenue and customer deposits	367	530
Other long-term liabilities	14	0
Net cash provided by operating activities	9,519	6,425
Cash flows from investing activities:
Purchase of property and equipment	(1,445)	(1,040)
Proceeds from disposals of property and equipment	0	30
Net cash used in investing activities	(1,445)	(1,010)
Cash flows from financing activities:
Cash dividends to stockholders	(2,580)	(3,356)
Purchase of common stock	(4,905)	(466)
Employee stock based compensation tax withholding	0	(3,825)
Net cash used in financing activities	(7,485)	(7,647)
Net increase (decrease) in cash and cash equivalents	589	(2,232)
Cash and cash equivalents, beginning of period	111,332	107,869
Cash and cash equivalents, end of period	111,921	105,637
Supplemental disclosure:
Income taxes paid	$ 352	$ 337

Business

Business	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business	Business — Spok Holdings, Inc. and its subsidiaries (collectively, "we", "Spok", or "the Company"), through our indirect wholly-owned subsidiary, Spok, Inc., is a comprehensive provider of critical communication solutions for enterprises. We are a leader in critical communication for healthcare, government, public safety and other industries. We deliver smart, reliable solutions to help protect the health, well-being and safety of people around the globe. Organizations worldwide rely on Spok for workflow improvement, secure texting, paging services, contact center optimization and public safety response. Our product offerings are capable of addressing a customer's mission critical communications needs.

Preparation of Interim Financia

Preparation of Interim Financial Statements	3 Months Ended
	Mar. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Preparation of Interim Financial Statements	Preparation of Interim Financial Statements — Our condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and the rules and regulations of the United States Securities and Exchange Commission (the “SEC”). Amounts shown on the condensed consolidated statements of income within the operating expense categories of cost of revenue; service, rental and maintenance; selling and marketing; and general and administrative are recorded exclusive of severance costs, and depreciation, amortization and accretion. These items are shown separately on the condensed consolidated statements of income within operating expenses. Foreign currency translation adjustments were deemed immaterial and consequently, no statements of comprehensive income are presented. The financial information included herein, other than the condensed consolidated balance sheet as of December 31, 2015 , is unaudited. The condensed consolidated balance sheet at December 31, 2015 has been derived from, but does not include, all the disclosures contained in the audited consolidated financial statements as of and for the year ended December 31, 2015 . In management’s opinion, our unaudited condensed consolidated statements include all adjustments and accruals that are necessary for a fair presentation of the results of all interim periods reported herein and all such adjustments are of a normal, recurring nature. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company's Annual Report on Form 10-K for the year ended December 31, 2015 (the “ 2015 Annual Report”). The condensed consolidated statements of income for the interim periods presented are not necessarily indicative of the results that may be expected for a full year. The accompanying condensed consolidated financial statements include our accounts and the accounts of our wholly-owned direct and indirect subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. The preparation of these condensed consolidated financial statements requires management to make judgments and estimates that affect the amounts reported in our condensed consolidated financial statements and accompanying notes. Actual results may differ from these estimates under different assumptions or conditions.

Risks and Other Important Facto

Risks and Other Important Factors	3 Months Ended
	Mar. 31, 2016
Risks and Uncertainties [Abstract]
Risks and Other Important Factors	Risks and Other Important Factors — See “Item 1A. Risk Factors” of Part II of this Quarterly Report on Form 10-Q (“Quarterly Report”) and "Item 1A. Risk Factors" of Part I of the 2015 Annual Report, which describes key risks associated with our operations and industry.

Recent and New Accounting Prono

Recent and New Accounting Pronouncements	3 Months Ended
	Mar. 31, 2016
Accounting Changes and Error Corrections [Abstract]
Recent and New Accounting Pronouncements	Recent and New Accounting Pronouncements — In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers . Since the ASU was issued, the FASB has issued several changes including ASU No. 2015-14, in July 2015, which delayed the effective date and ASU No. 2016-08, in March 2016, which updated guidance related to principle versus agent considerations. Our effective date is January 1, 2018 and while early adoption to the original effective date of January 1, 2017 is permitted, we have elected not to early adopt. ASU No. 2014-09 creates a five-step model that requires companies to exercise judgment when considering all relevant facts and circumstances in the determination of when and how revenue is recognized. The two permitted transition methods under the new standard are the full retrospective method, in which case the standard would be applied to each prior reporting period presented, or the modified retrospective method, in which case the cumulative effect of applying the standard would be recognized at the date of initial application. We have not selected a transition method. We continue to evaluate the potential impact from this ASU on our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases. The new standard establishes a right of use (“ROU”) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than twelve months. Leases will be classified as either financing or operating with classification affecting the pattern of expense recognition in the income statement. ASU No. 2016-02 will be effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. While we are still evaluating the impact of the potential new standard on our consolidated financial statements, we expect that upon adoption we will recognize ROU assets and lease liabilities and that the amounts could be material. In March 2016, the FASB issued ASU No. 2016-09, Stock Compensation Expense. The new standard is primarily focused on income taxes and the presentation of taxes related to stock compensation, but also provides a simpler method of accounting for forfeitures. An entity will now be able to make an entity-wide accounting policy election to either estimate the number of awards that are expected to be forfeited, as permissible under existing GAAP, or account for forfeitures as incurred. The purpose of this ASU was to reduce cost and complexity of the accounting related to share-based payment awards issued to employees for public and private companies. ASU No. 2016-09 will be effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years, and early adoption upon issuance of the ASU is permitted. We have adopted this new ASU to be effective January 1, 2016. As part of the adoption, we have made an accounting policy election to account for forfeitures as incurred rather than estimate the number of awards that are expected to be forfeited. The following summary provides further clarification of the transition approaches and the impact on the Company for each issue in ASU No. 2016-09 that requires a retrospective or modified retrospective approach: • For entities electing to account for forfeitures as they are incurred, a modified retrospective transition approach, with a cumulative-effect adjustment recognized in equity, is required for stock based compensation accounted for prior to the date on which the standard is adopted. We made the policy election to account for forfeitures as incurred and therefore, recorded a cumulative-effect adjustment in equity to account for this change. The overall impact to our consolidated financial statements is immaterial. Future forfeitures will be accounted for as they are incurred rather than estimating the number of awards that are expected to be forfeited at the time of grant. • A retrospective transition approach is required for classification of employee taxes paid on the Statement of Cash Flows when an employer withholds shares for tax-withholding purposes. In the first quarter of 2015, shares were withheld for tax-withholding purposes related to the payment of vested 2011 Long-Term Incentive Plan ("LTIP") awards. Previously, the withholdings were classified as an operating activity within our Statement of Cash Flows. We have retrospectively reclassified those withholdings as a financing activity and the total reclassification was $3.8 million . There was no additional impact on our financial statements, resulting from the adoption of ASU No. 2016-09, that required a retrospective or modified retrospective approach. Any additional requirements under this ASU will be accounted for on a prospective basis.

Inventory

Inventory	3 Months Ended
	Mar. 31, 2016
Inventory Disclosure [Abstract]
Inventory	Inventory — Inventory o f $ 2.0 million and $ 2.3 million at March 31, 2016 and December 31, 2015 , respective ly, consisted of third-party hardware and software held for resale. We value our inventory based on the lower of cost (determined using first-in, first-out) or current market value.

Depreciation, Amortization and

Depreciation, Amortization and Accretion	3 Months Ended
	Mar. 31, 2016
Depreciation, Amortization And Accretion [Abstract]
Depreciation, Amortization and Accretion	Depreciation, Amortization and Accretion — The total depreciation, amortization and accretion expenses related primarily to property and equipment, amortizable intangible assets, and asset retirement obligations for the three months ended March 31, 2016 and 2015 and were $3.3 million and $3.7 million , respectively. The consolidated expenses consisted of the following for the periods stated: For the Three Months Ended March 31, 2016 2015 (Dollars in Thousands) Depreciation Expense $ 2,057 $ 2,207 Amortization Expense 1,111 1,375 Accretion Expense 155 165 Total $ 3,323 $ 3,747

Goodwill and Amortizable Intang

Goodwill and Amortizable Intangible Assets	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Amortizable Intangible Assets	Goodwill and Amortizable Intangible Assets — Goodwill at March 31, 2016 and December 31, 2015 was $133.0 million . Goodwill is evaluated in the fourth quarter of each year and when events or circumstances suggest a potential impairment has occurred. There were no indicators of impairment as of March 31, 2016 . Amortizable intangible assets at March 31, 2016 primarily include customer related intangibles, technology based intangibles, contract based intangibles and marketing intangibles that resulted from our acquisition of Amcom Software, Inc. in 2011 and IMCO Technologies Corporation in 2012. Such intangibles are being amortized over periods ranging from two to ten years . The net consolidated balance of amortizable intangible assets consisted of the following: March 31, 2016 Useful Life Gross Carrying Accumulated Net Balance (Dollars in thousands) Customer relationships 10 $ 25,002 $ (12,710 ) $ 12,292 Acquired technology 2 - 4 8,454 (8,425 ) 29 Non-compete agreements 3 - 5 2,370 (2,370 ) — Trademarks 6 5,754 (4,222 ) 1,532 Total amortizable intangible assets $ 41,580 $ (27,727 ) $ 13,853 Estimated amortization of intangible assets for future periods was as follows: (Dollars in thousands) For the remaining nine months ending December 31, 2016 $ 3,049 For the year ending December 31: 2017 2,886 2018 2,500 2019 2,500 2020 2,500 Thereafter 418 Total amortizable intangible assets $ 13,853

Accounts Payable and Accrued Li

Accounts Payable and Accrued Liabilities	3 Months Ended
	Mar. 31, 2016
Payables and Accruals [Abstract]
Accounts Payable and Accrued Liabilities	Accounts Payable and Accrued Liabilities — Accounts payable and accrued liabilities were as follows: March 31, December 31, Accounts payable $ 1,192 $ 2,121 Accrued network costs 867 917 Accrued taxes 3,193 3,465 Accrued outside services 1,184 1,171 Accrued other 1,368 1,573 Total accounts payable and accrued liabilities $ 7,804 $ 9,247 Accrued taxes are based on our estimate of outstanding state and local taxes. This balance may be adjusted in the future as we settle with various taxing jurisdictions. Accounts payable decreased $0.9 million during the three months ended March 31, 2016 due to the timing related to the payment of invoices. Accrued Compensation and Benefits — Accrued compensation and benefits was $9.8 million at March 31, 2016 and $10.9 million at December 31, 2015 . The decrease of $1.1 million reflects a three month accrual for the Short-Term Incentive Plan ("STIP") at March 31, 2016 versus a twelve month accrual at December 31, 2015 and the timing of payroll payments.

Asset Retirement Obligations

Asset Retirement Obligations	3 Months Ended
	Mar. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	Asset Retirement Obligations — We recognize liabilities and corresponding assets for future obligations associated with the retirement of assets. We have paging equipment assets, principally transmitters, which are located on leased locations. The underlying leases generally require the removal of equipment at the end of the lease term; therefore, a future obligation exists. At January 1, 2016, we had recognized cumulative asset retirement costs of $3.6 million . During 2016, we have recorded nominal charges and as a result, the total cumulative asset retirement cost remains $3.6 million at March 31, 2016 . The asset retirement cost additions during the three months ended March 31, 2016 increased paging equipment assets and are being depreciated over the related estimated lives of 51 to 57 months . The asset retirement costs and the corresponding liabilities that have been recorded to date generally relate to either current plans to consolidate networks or to the removal of assets at an estimated future terminal date. The components of the changes in the asset retirement obligation liabilities were: Short-Term Long-Term Total (Dollars in thousands) Balance at January 1, 2016 $ 296 $ 7,543 $ 7,839 Accretion 9 146 155 Amounts Paid (59 ) — (59 ) Asset additions and (reductions) recorded — 14 14 Reclassifications 38 (38 ) — Balance at March 31, 2016 $ 284 $ 7,665 $ 7,949 The balances above were included within accounts payable and accrued liabilities and other long-term liabilities, respectively, at March 31, 2016 .

Deferred Revenue

Deferred Revenue	3 Months Ended
	Mar. 31, 2016
Revenue Recognition [Abstract]
Deferred Revenue	Deferred Revenue — Deferred revenue at March 31, 2016 was $27.4 million for the current portion and $0.7 million for the non-current portion. Deferred revenue at December 31, 2015 was $27.0 million for the current portion and $0.7 million for the non-current portion. Deferred revenue primarily consists of unearned maintenance, software license and professional services revenue. Unearned maintenance revenue represents a contractual liability to provide maintenance support over a defined period of time for which payment has generally been received. Unearned software license and professional services revenue represents a contractual liability to provide professional services more substantive than post contract support for which not all payments have been received. We will recognize revenue when the service or software is provided or the delivery otherwise meets our revenue recognition criteria.

Accrued Compensation and Benefi

Accrued Compensation and Benefits	3 Months Ended
	Mar. 31, 2016
Payables and Accruals [Abstract]
Accrued Compensation and Benefits	Accounts Payable and Accrued Liabilities — Accounts payable and accrued liabilities were as follows: March 31, December 31, Accounts payable $ 1,192 $ 2,121 Accrued network costs 867 917 Accrued taxes 3,193 3,465 Accrued outside services 1,184 1,171 Accrued other 1,368 1,573 Total accounts payable and accrued liabilities $ 7,804 $ 9,247 Accrued taxes are based on our estimate of outstanding state and local taxes. This balance may be adjusted in the future as we settle with various taxing jurisdictions. Accounts payable decreased $0.9 million during the three months ended March 31, 2016 due to the timing related to the payment of invoices. Accrued Compensation and Benefits — Accrued compensation and benefits was $9.8 million at March 31, 2016 and $10.9 million at December 31, 2015 . The decrease of $1.1 million reflects a three month accrual for the Short-Term Incentive Plan ("STIP") at March 31, 2016 versus a twelve month accrual at December 31, 2015 and the timing of payroll payments.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2016
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity and Stock Based Compensation — Our authorized capital stock consists of 75 million shares of common stock, par value $0.0001 per share, and 25 million shares of preferred stock, par value $0.0001 per share. Changes in Stockholders’ Equity. Changes in stockholders’ equity for the three months ended March 31, 2016 consisted of: (Dollars in thousands) Balance at January 1, 2016 $ 333,553 Net income for the three months ended March 31, 2016 3,444 Cash dividends declared (2,638 ) Amortization of stock based compensation 637 Common stock repurchase program (4,905 ) Balance at March 31, 2016 $ 330,091 General . At March 31, 2016 and December 31, 2015 , there were 20,603,617 and 20,886,261 shares of common stock outstanding, respectively, and no shares of preferred stock outstanding. The following table summarizes the activities under the 2012 Equity Incentive Award Plan (the "2012 Equity Plan") from January 1, 2016 through March 31, 2016 : Activity Total equity securities available at January 1, 2016 1,483,235 Less: 2015 LTIP Restricted Stock Units ("RSUs") awarded to eligible employees, net 227,958 Less: Restricted common stock awarded to non-executive members of the Board of Directors 5,869 Total equity securities available at March 31, 2016 1,249,408 2015 LTIP. On December 9, 2014, our Board of Directors adopted an LTIP (which provides for a 36 month vesting period) that included a stock component in the form of RSUs. Under this incentive program, RSUs will be granted to eligible employees annually and each annual grant will generally vest over a three year performance period. Our Board of Directors also approved that future cash dividends related to the RSUs will be set aside and paid in cash to each eligible employee when the RSUs are converted into shares of common stock. RSUs would be converted into shares of common stock on the earlier of a change in control of the Company (as defined in the 2015 LTIP) or on or after the third business day following the day that we file the Annual Report on Form 10-K with the SEC for the grant's final vesting year, but in no event later than December 31 of the year following the vesting date if the pre-established performance conditions are achieved. Any unvested RSUs awarded under the 2015 LTIP and the related cash dividends are forfeited if the participant terminates employment with the Company. On January 2, 2015, our Board of Directors granted 254,777 RSUs to eligible employees under the 2012 Equity Plan for the 2015 LTIP pursuant to a Restricted Stock Unit Agreement with a grant date fair value of $4.4 million . Eligible employees have the opportunity to earn RSUs based upon the achievement of performance goals established by our Board of Directors for our consolidated revenue and operating cash flows (as defined by the Company) during the period of January 1, 2015 through December 31, 2017 (“the 2015-2017 performance period”), and continued employment with the Company. As of December 31, 2015, 242,468 shares related to this grant remained outstanding. For the three months ended March 31, 2016 , 2,161 RSUs were forfeited by eligible employees who left the company. As of March 31, 2016 there were 240,307 RSUs outstanding relating to shares granted in January 2015. A total of $0.3 million was included in stock based compensation expense for the three months ended March 31, 2016 relating to this grant. On January 28, 2016, our Board of Directors granted 227,082 RSUs to eligible employees under the 2012 Equity Plan for the 2015 LTIP pursuant to a Restricted Stock Unit Agreement with a grant date fair value of $3.8 million . Eligible employees have the opportunity to earn RSUs based upon the achievement of performance goals established by our Board of Directors for our consolidated revenue and operating cash flows (as defined by the Company) during the period of January 1, 2016 through December 31, 2018 (“the 2016-2018 performance period”), and continued employment with the Company. For the three months ended March 31, 2016 , 2,046 RSUs were forfeited by eligible employees who left the company and 5,082 RSUs were granted to eligible employees who joined the company during the period. As of March 31, 2016 there were 230,118 RSUs outstanding relating to shares granted in January 2016. A total of $0.2 million was included in stock based compensation expense for the three months ended March 31, 2016 relating to this grant. The following table details activities with respect to RSUs issued and outstanding under the 2015 LTIP for the three months ended March 31, 2016 : Shares Weighted- Total Unrecognized Compensation Cost Weighted-Average Non-vested RSUs at January 1, 2016 242,468 $ 17.35 Granted 232,164 16.83 Vested — — Forfeited (4,207 ) 17.09 Non-vested RSUs at March 31, 2016 470,425 $ 17.09 $ 6,085 27 Stock Based Compensation. Compensation expense associated with RSUs and restricted common stock ("restricted stock") was recognized based on the fair value of the instruments, over the instruments’ vesting period. The following table reflects the statements of income line items for stock based compensation expense for the periods stated: For the Three Months Ended March 31, Operating Expense Category 2016 2015 (Dollars in thousands) Cost of revenue (LTIP) $ 49 $ 34 Service, rental and maintenance (LTIP) 52 29 Selling and marketing (LTIP) 48 51 General and administrative (LTIP) 380 236 General and administrative (Board of Directors Restricted Stock) 108 93 Total stock based compensation $ 637 $ 443 The increase in stock based compensation expense during the three months ended March 31, 2016 , compared to the same period in 2015 , was due primarily to the second RSU grant under the 2015 LTIP in January 2016. Each grant is amortized over the corresponding three year performance period beginning in the year of issuance. Cash Dividends to Stockholders. The following table details our cash dividend payments made in 2016 . Cash dividends paid as disclosed in the statements of cash flows for the three months ended March 31, 2016 and 2015 included previously declared cash dividends on shares of vested restricted stock issued to our non-executive directors and dividends related to vested RSUs issued to eligible employees. Cash dividends on RSUs and restricted stock have been accrued and are paid when the applicable vesting conditions are met. Accrued cash dividends on forfeited restricted stock and RSUs are also forfeited. Declaration Date Record Date Payment Date Per Share Amount Total Payment (1) (Dollars in thousands) February 24 March 18 March 30 $ 0.125 $ 2,580 (1) The total payment reflects the cash dividends paid in relation to common stock and vested restricted stock. Future Cash Dividends to Stockholders . On April 27, 2016 , our Board of Directors declared a regular quarterly cash dividend of $0.125 per share of common stock with a record date of May 23, 2016 , and a payment date of June 24, 2016 . This cash dividend of approximately $2.6 million will be paid from available cash on hand. Common Stock Repurchase Program. In October 2015, the Board of Directors extended the common stock repurchase program through December 31, 2016. In extending the common stock repurchase plan the Board of Directors reset the purchase authority to $10.0 million with the repurchase authority to begin the earlier of January 4, 2016 or the completion of the existing common stock repurchase program. The following table presents information with respect to purchases made by the Company during the three months ended March 31, 2016 : Period Total Number of Shares Purchased Average Price Paid Per Share Total Number of Shares Purchased as Part of the Publicly Announced Plans or Programs (1) Approximate Dollar Value of Shares That May Yet Be Purchased Under the Publicly Announced Plans or Programs (1) (Dollars in thousands) Beginning Balance $ 10,000 January 1 through January 31, 2016 152,198 $ 16.53 152,198 7,484 February 1 through February 29, 2016 101,736 17.24 101,736 5,730 March 1 through March 31, 2016 37,927 16.44 37,927 5,107 Total 291,861 $ 16.76 291,861 (1) In October 2015, the Board of Directors extended the common stock repurchase program through December 31, 2016, and maintained the repurchase authority of $10.0 million as of January 4, 2016. Additional Paid-in Capital. For the three months ended March 31, 2016 , additional paid-in capital decreased by $4.2 million to $106.2 million at March 31, 2016 from $110.4 million at December 31, 2015 . The decrease in the three months ended March 31, 2016 was due primarily to the repurchase of shares of common stock under the current stock repurchase program. Net Income per Common Share. Basic net income per common share is computed on the basis of the weighted average common shares outstanding. Diluted net income per common share is computed on the basis of the weighted average common shares outstanding plus the effect of all potentially dilutive common shares including outstanding restricted stock and RSUs, which are treated as contingently issuable shares, using the “treasury stock” method. The components of basic and diluted net income per common share were as follows for the periods stated: For the Three Months Ended March 31, 2016 2015 (Dollars in thousands, except share and per share amounts) Net income $ 3,444 $ 3,917 Weighted average shares of common stock outstanding 20,683,719 21,898,792 Dilutive effect of restricted stock and RSUs 161,942 154,223 Weighted average shares of common stock and common stock equivalents 20,845,661 22,053,015 Net income per common share Basic $ 0.17 $ 0.18 Diluted $ 0.17 $ 0.18

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes — We file a consolidated U.S. Federal income tax return and income tax returns in state, local and foreign jurisdictions as required. At March 31, 2016 , we had total deferred income tax assets of $127.5 million and a valuation allowance of $45.8 million resulting in an estimated recoverable amount of deferred income tax assets of $81.7 million . This reflects a change from the December 31, 2015 balance of deferred income tax assets of $129.8 million and a valuation allowance of $45.8 million resulting in an estimated recoverable amount of $84.0 million . The change reflects the expected usage of the deferred income tax assets based on estimated 2016 taxable income. We consider both positive and negative evidence when evaluating the recoverability of our deferred income tax assets. The assessment is required to determine whether based on all available evidence, it is more likely than not (i.e., greater than a 50% probability) whether all or some portion of the deferred income tax assets will be realized in the future. During the three months ended March 31, 2016 we did not adjust the valuation allowance. The anticipated effective income tax rate is expected to continue to differ from the Federal statutory rate of 35% primarily due to the effect of state income taxes, the effect of changes to the deferred income tax asset valuation allowance, permanent differences between book and taxable income and certain discrete items. As of January 1 2016, we had approximately $282.1 million of Federal net operating losses (“NOLs”) available to offset future taxable income. Section 382 of the Internal Revenue Code limited NOLs, as of January 1, 2016, were $36.6 million which may be used at a rate of $6.1 million per year, and is included in the total Federal NOLs.

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2016
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions — A member of our Board of Directors also serves as a Director for an entity that leases transmission tower sites to the Company. For the three months ended March 31, 2016 and 2015 , we incurred site rent expenses of $1.0 million and $1.0 million , respectively, from the entity on which the individual serves as a Director. Site rent expenses are included in service, rental and maintenance expenses.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies — There have been no material changes during the three months ended March 31, 2016 to the commitments and contingencies previously reported in the 2015 Annual Report.

Depreciation, Amortization an21

Depreciation, Amortization and Accretion (Tables)	3 Months Ended
	Mar. 31, 2016
Depreciation, Amortization And Accretion [Abstract]
Summary of Depreciation, Amortization and Accretion	The consolidated expenses consisted of the following for the periods stated: For the Three Months Ended March 31, 2016 2015 (Dollars in Thousands) Depreciation Expense $ 2,057 $ 2,207 Amortization Expense 1,111 1,375 Accretion Expense 155 165 Total $ 3,323 $ 3,747

Goodwill and Amortizable Inta22

Goodwill and Amortizable Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Net Consolidated Balance of Amortizable Intangible Assets	The net consolidated balance of amortizable intangible assets consisted of the following: March 31, 2016 Useful Life Gross Carrying Accumulated Net Balance (Dollars in thousands) Customer relationships 10 $ 25,002 $ (12,710 ) $ 12,292 Acquired technology 2 - 4 8,454 (8,425 ) 29 Non-compete agreements 3 - 5 2,370 (2,370 ) — Trademarks 6 5,754 (4,222 ) 1,532 Total amortizable intangible assets $ 41,580 $ (27,727 ) $ 13,853
Estimated Amortization of Intangible Assets	Estimated amortization of intangible assets for future periods was as follows: (Dollars in thousands) For the remaining nine months ending December 31, 2016 $ 3,049 For the year ending December 31: 2017 2,886 2018 2,500 2019 2,500 2020 2,500 Thereafter 418 Total amortizable intangible assets $ 13,853

Accounts Payable and Accrued 23

Accounts Payable and Accrued Liabilities (Tables)	3 Months Ended
	Mar. 31, 2016
Payables and Accruals [Abstract]
Components of Accounts Payable and Accrued Liabilities	Accounts payable and accrued liabilities were as follows: March 31, December 31, Accounts payable $ 1,192 $ 2,121 Accrued network costs 867 917 Accrued taxes 3,193 3,465 Accrued outside services 1,184 1,171 Accrued other 1,368 1,573 Total accounts payable and accrued liabilities $ 7,804 $ 9,247

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	3 Months Ended
	Mar. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]
Changes in Asset Retirement Obligation Liabilities	The components of the changes in the asset retirement obligation liabilities were: Short-Term Long-Term Total (Dollars in thousands) Balance at January 1, 2016 $ 296 $ 7,543 $ 7,839 Accretion 9 146 155 Amounts Paid (59 ) — (59 ) Asset additions and (reductions) recorded — 14 14 Reclassifications 38 (38 ) — Balance at March 31, 2016 $ 284 $ 7,665 $ 7,949

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2016
Equity [Abstract]
Changes in Stockholders' Equity	Changes in stockholders’ equity for the three months ended March 31, 2016 consisted of: (Dollars in thousands) Balance at January 1, 2016 $ 333,553 Net income for the three months ended March 31, 2016 3,444 Cash dividends declared (2,638 ) Amortization of stock based compensation 637 Common stock repurchase program (4,905 ) Balance at March 31, 2016 $ 330,091
Activities Under Equity Plan	The following table summarizes the activities under the 2012 Equity Incentive Award Plan (the "2012 Equity Plan") from January 1, 2016 through March 31, 2016 : Activity Total equity securities available at January 1, 2016 1,483,235 Less: 2015 LTIP Restricted Stock Units ("RSUs") awarded to eligible employees, net 227,958 Less: Restricted common stock awarded to non-executive members of the Board of Directors 5,869 Total equity securities available at March 31, 2016 1,249,408
Summary of Outstanding RSUs under 2011 LTIP	The following table details activities with respect to RSUs issued and outstanding under the 2015 LTIP for the three months ended March 31, 2016 : Shares Weighted- Total Unrecognized Compensation Cost Weighted-Average Non-vested RSUs at January 1, 2016 242,468 $ 17.35 Granted 232,164 16.83 Vested — — Forfeited (4,207 ) 17.09 Non-vested RSUs at March 31, 2016 470,425 $ 17.09 $ 6,085 27
Schedule of Stock Based Compensation Expense for Awards Under Equity Plans	Compensation expense associated with RSUs and restricted common stock ("restricted stock") was recognized based on the fair value of the instruments, over the instruments’ vesting period. The following table reflects the statements of income line items for stock based compensation expense for the periods stated: For the Three Months Ended March 31, Operating Expense Category 2016 2015 (Dollars in thousands) Cost of revenue (LTIP) $ 49 $ 34 Service, rental and maintenance (LTIP) 52 29 Selling and marketing (LTIP) 48 51 General and administrative (LTIP) 380 236 General and administrative (Board of Directors Restricted Stock) 108 93 Total stock based compensation $ 637 $ 443
Cash Dividends Declared	The following table details our cash dividend payments made in 2016 . Cash dividends paid as disclosed in the statements of cash flows for the three months ended March 31, 2016 and 2015 included previously declared cash dividends on shares of vested restricted stock issued to our non-executive directors and dividends related to vested RSUs issued to eligible employees. Cash dividends on RSUs and restricted stock have been accrued and are paid when the applicable vesting conditions are met. Accrued cash dividends on forfeited restricted stock and RSUs are also forfeited. Declaration Date Record Date Payment Date Per Share Amount Total Payment (1) (Dollars in thousands) February 24 March 18 March 30 $ 0.125 $ 2,580 (1) The total payment reflects the cash dividends paid in relation to common stock and vested restricted stock.
Class of Treasury Stock	The following table presents information with respect to purchases made by the Company during the three months ended March 31, 2016 : Period Total Number of Shares Purchased Average Price Paid Per Share Total Number of Shares Purchased as Part of the Publicly Announced Plans or Programs (1) Approximate Dollar Value of Shares That May Yet Be Purchased Under the Publicly Announced Plans or Programs (1) (Dollars in thousands) Beginning Balance $ 10,000 January 1 through January 31, 2016 152,198 $ 16.53 152,198 7,484 February 1 through February 29, 2016 101,736 17.24 101,736 5,730 March 1 through March 31, 2016 37,927 16.44 37,927 5,107 Total 291,861 $ 16.76 291,861 (1) In October 2015, the Board of Directors extended the common stock repurchase program through December 31, 2016, and maintained the repurchase authority of $10.0 million as of January 4, 2016.
Basic and Diluted Net Income Per Common Shares	The components of basic and diluted net income per common share were as follows for the periods stated: For the Three Months Ended March 31, 2016 2015 (Dollars in thousands, except share and per share amounts) Net income $ 3,444 $ 3,917 Weighted average shares of common stock outstanding 20,683,719 21,898,792 Dilutive effect of restricted stock and RSUs 161,942 154,223 Weighted average shares of common stock and common stock equivalents 20,845,661 22,053,015 Net income per common share Basic $ 0.17 $ 0.18 Diluted $ 0.17 $ 0.18

Recent and New Accounting Pro26

Recent and New Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock based compensation tax withholding	$ 0	$ 3,825
Adjustments for New Accounting Pronouncement [Member] | 2011 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock based compensation tax withholding		$ 3,800

Inventory - Additional Informat

Inventory - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Inventory	$ 1,986	$ 2,291

Depreciation, Amortization an28

Depreciation, Amortization and Accretion - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Depreciation, Amortization And Accretion [Abstract]
Depreciation, amortization and accretion expense	$ 3,323	$ 3,747

Depreciation, Amortization an29

Depreciation, Amortization and Accretion - Summary of Depreciation, Amortization and Accretion (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Depreciation, Amortization And Accretion [Abstract]
Depreciation Expense	$ 2,057	$ 2,207
Amortization Expense	1,111	1,375
Accretion Expense	155	165
Total	$ 3,323	$ 3,747

Goodwill and Amortizable Inta30

Goodwill and Amortizable Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 133,031	$ 133,031
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (In Years)	2 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (In Years)	10 years

Goodwill and Amortizable Inta31

Goodwill and Amortizable Intangible Assets - Net Consolidated Balance of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 41,580
Accumulated Amortization	(27,727)
Total amortizable intangible assets	$ 13,853	$ 14,964
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (In Years)	10 years
Gross Carrying Amount	$ 25,002
Accumulated Amortization	(12,710)
Total amortizable intangible assets	12,292
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,454
Accumulated Amortization	(8,425)
Total amortizable intangible assets	29
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,370
Accumulated Amortization	(2,370)
Total amortizable intangible assets	$ 0
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (In Years)	6 years
Gross Carrying Amount	$ 5,754
Accumulated Amortization	(4,222)
Total amortizable intangible assets	$ 1,532
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (In Years)	2 years
Minimum [Member] | Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (In Years)	2 years
Minimum [Member] | Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (In Years)	3 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (In Years)	10 years
Maximum [Member] | Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (In Years)	4 years
Maximum [Member] | Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life (In Years)	5 years

Goodwill and Amortizable Inta32

Goodwill and Amortizable Intangible Assets - Estimated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
For the year ending December 31:	$ 3,049
2,017	2,886
2,018	2,500
2,019	2,500
2,020	2,500
Thereafter	418
Total amortizable intangible assets	$ 13,853	$ 14,964

Accounts Payable and Accrued 33

Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accounts payable	$ 1,192	$ 2,121
Accrued network costs	867	917
Accrued taxes	3,193	3,465
Accrued outside services	1,184	1,171
Accrued other	1,368	1,573
Total accounts payable and accrued liabilities	7,804	$ 9,247
Decrease in accounts payable	$ 900

Asset Retirement Obligations -

Asset Retirement Obligations - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Asset Retirement Obligation Liabilities [Line Items]
Cumulative asset retirement costs	$ 3.6	$ 3.6
Minimum [Member]
Asset Retirement Obligation Liabilities [Line Items]
Estimated lives for depreciation of asset retirement cost additions	51 months
Maximum [Member]
Asset Retirement Obligation Liabilities [Line Items]
Estimated lives for depreciation of asset retirement cost additions	57 months

Asset Retirement Obligations 35

Asset Retirement Obligations - Changes in Asset Retirement Obligation Liabilities (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at January 1, 2016	$ 7,839
Accretion	155
Amounts Paid	(59)
Asset additions and (reductions) recorded	14
Reclassifications	0
Balance at March 31, 2016	7,949
Short-Term Portion [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at January 1, 2016	296
Accretion	9
Amounts Paid	(59)
Asset additions and (reductions) recorded	0
Reclassifications	38
Balance at March 31, 2016	284
Long-Term Portion [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at January 1, 2016	7,543
Accretion	146
Amounts Paid	0
Asset additions and (reductions) recorded	14
Reclassifications	(38)
Balance at March 31, 2016	$ 7,665

Deferred Revenue - Additional I

Deferred Revenue - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Revenue Recognition [Abstract]
Deferred revenue, current	$ 27,415	$ 27,045
Deferred revenue, non-current	$ 738	$ 741

Accrued Compensation and Bene37

Accrued Compensation and Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accrued compensation and benefits	$ 9,837	$ 10,864
Decrease in accrued compensation and benefits	$ 1,100

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	Apr. 27, 2016	Jan. 28, 2016	Jan. 02, 2015	Dec. 09, 2014	Mar. 31, 2016	Mar. 31, 2015	Jan. 04, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized (shares)					75,000,000
Common stock par value (usd per share)					$ 0.0001
Preferred stock authorized (shares)					25,000,000
Preferred stock par value (usd per share)					$ 0.0001
Common stock outstanding (shares)					20,603,617			20,886,261
Preferred stock outstanding (shares)					0			0
Total stock based compensation					$ 637,000	$ 443,000
Decrease in additional paid-in capital					4,200,000
Additional paid-in capital					$ 106,234,000			$ 110,435,000
Common Stock Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase authority							$ 10,000,000
2015 LTIP [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				36 months
Granted (shares)					232,164
Forfeited (shares)					4,207
Shares outstanding (shares)					470,425			242,468
January 2, 2015 [Member] | 2015 LTIP [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)			254,777
Granted			$ 4,400,000
Forfeited (shares)					2,161
Shares outstanding (shares)					240,307			242,468
Total stock based compensation					$ 300,000
January 28, 2016 [Member] | 2015 LTIP [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)		227,082			5,082
Granted		$ 3,800,000
Forfeited (shares)					2,046
Shares outstanding (shares)					230,118
Total stock based compensation					$ 200,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Declaration date	Apr. 27, 2016
Dividend rate (usd per share)	$ 0.125
Record date	May 23, 2016
Payment date	Jun. 24, 2016
Dividends declared	$ 2,600,000

Stockholders' Equity - Changes

Stockholders' Equity - Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at January 1, 2016	$ 333,553
Net income for the three months ended March 31, 2016	3,444	$ 3,917
Cash dividends declared	(2,638)
Amortization of stock based compensation	637
Stock repurchase	(4,905)
Balance at March 31, 2016	$ 330,091

Stockholders' Equity - Activiti

Stockholders' Equity - Activities Under Equity Plan (Detail) - shares	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity securities available at January 1, 2016		1,483,235
Total equity securities available at March 31, 2016	1,249,408
Restricted Stock Units [Member] | 2011 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Add: 2011 LTIP RSUs forfeited by eligible employees	227,958
Restricted Stock Units [Member] | Other Repurchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Add: 2011 LTIP RSUs forfeited by eligible employees	5,869

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Outstanding RSUs under the 2015 LTIP (Detail) - Restricted Stock Units [Member] - 2015 LTIP [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance (shares) | shares	242,468
Granted (shares) | shares	232,164
Vested (shares) | shares	0
Forfeited (shares) | shares	(4,207)
Ending Balance (shares) | shares	470,425
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning Balance, Weighted Average Grant Date Fair Value (usd per share) | $ / shares	$ 17.35
Granted, Weighted Average Grant Date Fair Value (usd per share) | $ / shares	16.83
Vested, Weighted Average Grant Date Fair Value (usd per share) | $ / shares	0
Forfeited, Weighted Average Grant Date Fair Value (usd per share) | $ / shares	17.09
Ending Balance, Weighted Average Grant Date Fair Value (usd per share) | $ / shares	$ 17.09
Total Unrecognized Compensation Cost (net of estimated forfeitures) | $	$ 6,085
Weighted-Average Period Over Which Cost is Expected to be Recognized	27 months

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Stock Based Compensation Expense for Awards Under Equity Plans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$ 637	$ 443
Cost of Revenue [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	49	34
Service, rental and maintenance [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	52	29
Selling and Marketing [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	48	51
General and Administrative [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	380	236
General and Administrative [Member] | Board Of Directors [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$ 108	$ 93

Stockholders' Equity - Cash Div

Stockholders' Equity - Cash Dividends Declared to Stockholders (Detail) - Common Stock [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Declaration Date	Feb. 24, 2016
Record Date	Mar. 18, 2016
Payment Date	Mar. 30, 2016
Per Share Amount (usd per share) | $ / shares	$ 0.125
Total Payment | $	$ 2,580

Stockholders' Equity - Treasury

Stockholders' Equity - Treasury Stock (Details) - USD ($)	1 Months Ended			3 Months Ended
	Mar. 31, 2016	Feb. 29, 2016	Jan. 31, 2015	Mar. 31, 2016	Jan. 31, 2016	Jan. 04, 2016	Dec. 31, 2015
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased (shares)	37,927	101,736	152,198	291,861
Average Price Paid Per Share (usd per share)	$ 16.44	$ 17.24	$ 16.53	$ 16.76
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Publicly Announced Plans or Programs	$ 5,107,000	$ 5,730,000		$ 5,107,000	$ 7,484,000		$ 10,000,000
Common Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased (shares)	37,927	101,736	152,198	291,861
Stock repurchase authority						$ 10,000,000

Stockholders' Equity - Basic an

Stockholders' Equity - Basic and Diluted Net Income Per Common Shares (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Net income	$ 3,444	$ 3,917
Weighted average shares of common stock outstanding (shares)	20,683,719	21,898,792
Dilutive effect of restricted stock and RSUs (shares)	161,942	154,223
Weighted average shares of common stock and common stock equivalents (shares)	20,845,661	22,053,015
Basic net income per common share (usd per share)	$ 0.17	$ 0.18
Diluted net income per common share (usd per share)	$ 0.17	$ 0.18

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Deferred tax assets, gross	$ 127.5	$ 129.8
Valuation allowance	45.8	45.8
Estimated recoverable deferred income tax assets	$ 81.7	84
Percentage of probability of deferred income tax realized in future	50.00%
Valuation allowance, methodologies and assumptions	"more likely than not" (greater than a 50% probability)
Federal income tax at statutory rate	35.00%
Approximate Federal net operating losses ("NOLs") available to offset future taxable income		282.1
Limited net operating losses rate under "IRC Section 382"		36.6
Allowable net operating losses utilize per year under "IRC Section 382"		$ 6.1

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Related Party Transactions [Abstract]
Site rent expense	$ 1	$ 1