Spok (SPOK) 10-Q 29 Jul 21 2021 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2021	Jul. 23, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	001-32358
Entity Registrant Name	SPOK HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	16-1694797
Entity Address, Address Line One	5911 Kingstown Village Pkwy, 6th Floor
Entity Address, City or Town	Alexandria,
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	22315
City Area Code	800
Local Phone Number	611-8488
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	SPOK
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (shares)		19,467,300
Entity Central Index Key	0001289945
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 38,127	$ 48,729
Short-term investments	29,998	29,995
Accounts receivable, net	27,483	29,934
Prepaid expenses	8,369	8,958
Other current assets	1,197	1,269
Total current assets	105,174	118,885
Non-current assets:
Property and equipment, net	7,861	7,815
Operating lease right-of-use assets	16,769	14,016
Capitalized software development, net	13,499	10,179
Goodwill	99,175	99,175
Intangible assets, net	0	417
Deferred income tax assets, net	25,969	25,826
Other non-current assets	792	978
Total non-current assets	164,065	158,406
Total assets	269,239	277,291
Current liabilities:
Accounts payable	4,166	6,685
Accrued compensation and benefits	12,621	14,103
Deferred revenue	25,598	27,686
Operating lease liabilities	5,825	5,264
Other current liabilities	4,305	3,702
Total current liabilities	52,515	57,440
Non-current liabilities:
Asset retirement obligations	7,465	7,289
Operating lease liabilities	12,211	9,456
Other non-current liabilities	2,044	2,493
Total non-current liabilities	21,720	19,238
Total liabilities	74,235	76,678
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock	0	0
Common stock	2	2
Additional paid-in capital	94,276	91,780
Accumulated other comprehensive loss	(1,435)	(1,452)
Retained earnings	102,161	110,283
Total stockholders’ equity	195,004	200,613
Total liabilities and stockholders' equity	$ 269,239	$ 277,291

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue:
Total revenue	$ 35,723	$ 35,739	$ 71,759	$ 73,006
Operating expenses:
Cost of revenue (exclusive of items shown separately below)	6,973	5,901	14,214	14,165
Research and development	4,278	2,754	8,784	8,203
Technology operations	7,087	7,212	14,339	15,115
Selling and marketing	4,980	3,831	9,880	10,192
General and administrative	11,557	10,810	22,707	22,061
Depreciation, amortization and accretion	2,457	2,072	5,184	4,218
Total operating expenses	37,332	32,580	75,108	73,954
Operating (loss) income	(1,609)	3,159	(3,349)	(948)
Interest income	61	146	122	509
Other income (expense)	29	101	2	(37)
(Loss) income before income taxes	(1,519)	3,406	(3,225)	(476)
Benefit from (provision for) income taxes	800	353	209	(304)
Net (loss) income	$ (719)	$ 3,759	$ (3,016)	$ (780)
Basic net loss per common share (usd per share)	$ (0.04)	$ 0.20	$ (0.16)	$ (0.04)
Diluted net loss per common share (usd per share)	$ (0.04)	$ 0.20	$ (0.16)	$ (0.04)
Basic weighted average common shares outstanding (in shares)	19,395,364	19,016,853	19,335,081	18,987,469
Diluted weighted average common shares outstanding (in shares)	19,395,364	19,115,148	19,335,081	18,987,469
Cash dividends declared per common share (usd per share)	$ 0.125	$ 0.125	$ 0.250	$ 0.250
Wireless
Revenue:
Total revenue	$ 19,859	$ 21,078	$ 39,979	$ 42,465
Software
Revenue:
Total revenue	$ 15,864	$ 14,661	$ 31,780	$ 30,541

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (719)	$ 3,759	$ (3,016)	$ (780)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	3	103	17	(117)
Other comprehensive income (loss)	3	103	17	(117)
Comprehensive (loss) income	$ (716)	$ 3,862	$ (2,999)	$ (897)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital & Accumulated Other Comprehensive Loss	Retained Earnings	Adoption of current expected credit loss ("CECL")	Adoption of current expected credit loss ("CECL")Retained Earnings
Beginning balance (shares) at Dec. 31, 2019		19,071,614
Beginning balance at Dec. 31, 2019	$ 250,094	$ 2	$ 85,273	$ 164,819	$ (365)	$ (365)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(4,539)			(4,539)
Purchase of common stock for tax withholding (shares)		(79,981)
Purchase of common stock for tax withholding	(903)		(903)
Amortization of stock-based compensation	1,182		1,182
Cash dividends declared	(2,488)			(2,488)
Issuance of restricted stock under the equity plans and other (shares)		1,918
Issuance of restricted stock under the equity plans and other	19			19
Cumulative translation adjustment	$ (220)		(220)
Adoption of current expected credit loss ("CECL")	us-gaap:AccountingStandardsUpdate201613Member
Ending balance (shares) at Mar. 31, 2020		18,993,551
Ending balance at Mar. 31, 2020	$ 242,780	$ 2	85,332	157,446
Beginning balance (shares) at Dec. 31, 2019		19,071,614
Beginning balance at Dec. 31, 2019	250,094	$ 2	85,273	164,819	$ (365)	$ (365)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(780)
Cumulative translation adjustment	(117)
Ending balance (shares) at Jun. 30, 2020		19,023,795
Ending balance at Jun. 30, 2020	245,681	$ 2	86,963	158,716
Beginning balance (shares) at Mar. 31, 2020		18,993,551
Beginning balance at Mar. 31, 2020	242,780	$ 2	85,332	157,446
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	3,759			3,759
Amortization of stock-based compensation	1,362		1,362
Cash dividends declared	(2,491)			(2,491)
Issuance of restricted stock under the equity plans and other (shares)		30,244
Issuance of restricted stock under the equity plans and other	168		166	2
Cumulative translation adjustment	103		103
Ending balance (shares) at Jun. 30, 2020		19,023,795
Ending balance at Jun. 30, 2020	245,681	$ 2	86,963	158,716
Beginning balance (shares) at Dec. 31, 2020		19,384,192
Beginning balance at Dec. 31, 2020	200,613	$ 2	90,328	110,283
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(2,297)			(2,297)
Purchase of common stock for tax withholding (shares)		(132,281)
Purchase of common stock for tax withholding	(1,444)		(1,444)
Amortization of stock-based compensation	2,239		2,239
Cash dividends declared	(2,553)			(2,553)
Issuance of restricted stock under the equity plans and other (shares)		20,952
Cumulative translation adjustment	$ 14		14
Issuance of common stock in lieu of cash compensation (shares)	50,741
Ending balance (shares) at Mar. 31, 2021		19,323,604
Ending balance at Mar. 31, 2021	$ 196,572	$ 2	91,137	105,433
Beginning balance (shares) at Dec. 31, 2020		19,384,192
Beginning balance at Dec. 31, 2020	200,613	$ 2	90,328	110,283
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,016)
Cumulative translation adjustment	17
Ending balance (shares) at Jun. 30, 2021		19,401,170
Ending balance at Jun. 30, 2021	195,004	$ 2	92,841	102,161
Beginning balance (shares) at Mar. 31, 2021		19,323,604
Beginning balance at Mar. 31, 2021	196,572	$ 2	91,137	105,433
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(719)			(719)
Purchase of common stock for tax withholding (shares)		(19,874)
Purchase of common stock for tax withholding	(212)		(212)
Amortization of stock-based compensation	1,781		1,781
Cash dividends declared	(2,553)			(2,553)
Issuance of restricted stock under the equity plans and other (shares)		39,010
Issuance of restricted stock under the equity plans and other	132		132	0
Cumulative translation adjustment	$ 3		3
Issuance of common stock in lieu of cash compensation (shares)	58,430
Ending balance (shares) at Jun. 30, 2021		19,401,170
Ending balance at Jun. 30, 2021	$ 195,004	$ 2	$ 92,841	$ 102,161

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Net loss	$ (3,016)	$ (780)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and accretion	5,184	4,218
Deferred income tax (benefit) expense	(291)	290
Stock-based compensation	4,020	2,544
Provisions for doubtful accounts, service credits and other	657	673
Changes in assets and liabilities:
Accounts receivable	1,775	(670)
Prepaid expenses and other assets	994	475
Net operating lease liabilities	563	(60)
Accounts payable, accrued liabilities and other	(3,538)	1,142
Deferred revenue	(2,482)	(1,373)
Net cash provided by operating activities	3,866	6,459
Investing activities:
Purchases of property and equipment	(2,198)	(1,895)
Capitalized software development	(5,618)	(5,300)
Purchase of short-term investments	(29,993)	(29,877)
Maturity of short-term investments	30,000	30,000
Net cash used in investing activities	(7,809)	(7,072)
Financing activities:
Cash distributions to stockholders	(5,152)	(5,008)
Proceeds from issuance of common stock under the Employee Stock Purchase Plan	132	166
Purchase of common stock for tax withholding on vested equity awards	(1,656)	(903)
Net cash used in financing activities	(6,676)	(5,745)
Effect of exchange rate on cash	17	(117)
Net decrease in cash and cash equivalents	(10,602)	(6,475)
Cash and cash equivalents, beginning of period	48,729	47,361
Cash and cash equivalents, end of period	38,127	40,886
Supplemental disclosure:
Income taxes (refunds received) paid	$ (42)	$ 148

Organization and Significant Ac

Organization and Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Organization and Significant Accounting Policies	ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES Spok Holdings, Inc. (NASDAQ: SPOK) ("Spok," "we," "our" or the "Company"), through its wholly owned subsidiary Spok, Inc., is the global leader in healthcare communications. We deliver clinical information to care teams when and where it matters most to improve patient outcomes. Top hospitals rely on Spok products and services to enhance workflows for clinicians, support administrative compliance, and provide a better experience for patients. We offer a focused suite of unified clinical communication and collaboration solutions that include call center applications, clinical alerting and notifications, one-way and advanced two-way wireless messaging services, mobile communications and public safety solutions. We provide one-way and advanced two-way wireless messaging services, including information services, throughout the United States. These services are offered on a local, regional and nationwide basis employing digital networks. One-way messaging consists of numeric and alphanumeric messaging services. Numeric messaging services enable subscribers to receive messages that are composed entirely of numbers, such as a phone number, while alphanumeric messages may include numbers and letters, which enable subscribers to receive text messages. Two-way messaging services enable subscribers to send and receive messages to and from other wireless messaging devices, including pagers, personal digital assistants and personal computers. We also offer voice mail, personalized greetings, message storage and retrieval, and equipment loss and/or maintenance protection to both one-way and two-way messaging subscribers. These services are commonly referred to as wireless messaging and information services. We also develop, sell and support enterprise-wide systems for hospitals and other organizations needing to automate, centralize and standardize clinical communications. These solutions are used for contact centers, clinical alerting and notification, mobile communications and messaging and for public safety notifications. We offer a variety of solutions in both on-premise and Software as a Service ("SaaS") delivery models. The Spok Go ® platform was made commercially available in early 2020. Spok Go features an integrated cloud-native platform that is built on a foundation of a single, best-in-class architecture with hosting and security handled through our partnership with Amazon Web Services ® . These areas of market focus complement those of our wireless services outlined above. These products and services are commonly referred to as software solutions and services. Basis of Presentation 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. Our Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) and the rules and regulations of the United States Securities and Exchange Commission (the “SEC”). In management's opinion, the unaudited Condensed Consolidated Financial Statements include all adjustments and accruals that are necessary for the presentation of the results of all interim periods reported herein and all such adjustments are of a normal, recurring nature. Amounts shown on the Condensed Consolidated Statements of Operations within the operating expense categories of Cost of revenue; Research and development; Technology operations; Selling and marketing; and General and administrative are recorded exclusive of depreciation, amortization and accretion. Certain immaterial prior period amounts in the Condensed Consolidated Financial Statements have been reclassified to conform to the current period's presentation. These reclassifications had no effect on the reported results of operations or the statement of financial position. The financial information included herein, other than the Condensed Consolidated Balance Sheet as of December 31, 2020, is unaudited. The Condensed Consolidated Balance Sheet as of December 31, 2020, 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, 2020. 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, 2020 (the “2020 Annual Report”). The Condensed Consolidated Statements of Operations for the interim periods presented are not necessarily indicative of the results that may be expected for a full year. Use of Estimates The preparation of these Condensed Consolidated Financial Statements requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosures. On an ongoing basis, we evaluate estimates and assumptions, including, but not limited to, those related to the impairment of long-lived assets, intangible assets subject to amortization and goodwill, accounts receivable allowances, revenue recognition, determining the standalone selling price of performance obligations, variable consideration, depreciation expense, asset retirement obligations, income taxes and capitalization of software costs. We base our estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

Risks and Other Important Facto

Risks and Other Important Factors	6 Months Ended
	Jun. 30, 2021
Risks and Uncertainties [Abstract]
Risks and Other Important Factors	RISKS AND OTHER IMPORTANT FACTORSSee “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 2020 Annual Report, which describe key risks associated with our operations and industry.

Recent Accounting Standards

Recent Accounting Standards	6 Months Ended
	Jun. 30, 2021
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Standards	RECENT ACCOUNTING STANDARDS The Company considers the applicability and impact of all Accounting Standards Updates ("ASUs") issued by the Financial Accounting Standards Board ("FASB"). The Company has determined that all recent ASUs issued by the FASB are either not applicable or are expected to have minimal impact on the Company's Condensed Consolidated Financial Statements.

Significant Accounting Policies

Significant Accounting Policies Update	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Significant Accounting Policies Update	SIGNIFICANT ACCOUNTING POLICIES UPDATE Our significant accounting policies are detailed in Note 1, “Organization and Significant Accounting Policies” of the 2020 Annual Report.

Revenue, Deferred Revenue And P

Revenue, Deferred Revenue And Prepaid Commissions	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue, Deferred Revenue and Prepaid Commissions	REVENUE, DEFERRED REVENUE AND PREPAID COMMISSIONS Wireless Revenue Wireless revenue consists of two primary components: paging revenue and product and other revenue. Paging revenue consists primarily of recurring fees associated with the provision of messaging services and fees for paging devices and is net of a provision for service credits. Product and other revenue reflects system sales, the sale of devices and charges for paging devices that are not returned and are net of anticipated credits. Our core offering includes subscriptions to one-way or two-way messaging services for a periodic (monthly, quarterly, semiannual, or annual) service fee. This is generally based upon the type of service provided, the geographic area covered, the number of devices provided to the customer and the period of commitment. A subscriber to one-way messaging services may select coverage on a local, regional or nationwide basis to best meet their messaging needs. Two-way messaging is generally offered on a nationwide basis. (See Item 1. “Business,” in the 2020 Annual Report for more details.) Software Revenue Software revenue consists of two primary components: operations revenue and maintenance revenue. Operations revenue consists primarily of license and subscription revenues for our healthcare communications solutions, revenue from the sale of equipment that facilitates the use of our software solutions, and professional services revenue related to the implementation of our solutions. Maintenance revenue is for ongoing support of our software solutions or related equipment and access to when-and-if available software updates. Maintenance is generally purchased and renewed on an annual basis. Revenue Recognition Revenues are recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. Our software licenses and hardware are generally recognized at a point in time when we have transferred control to the customer. For software licenses, revenue is not recognized until the related license(s) has been made available to the customer and the customer can begin to benefit from its right to use the license(s). Our software licenses represent a right to use Spok’s intellectual property ("IP") as it exists at a point in time at which the license is granted. Many of our software licenses have significant standalone functionality due to their ability to process a transaction or perform a function or task, and we do not need to maintain those products, once provided to the customer, for value to exist. While the functionality of the IP that we license may substantively change during the license period, customers are not contractually or practically required to update their license as a result of those changes. Our wireless, professional, subscription, and maintenance services are generally recognized over time due to a customer's simultaneous receipt and consumption of the benefit as we perform the work. As we transfer control over time, we recognize revenue based on the extent of progress towards completion of the performance obligation. The selection of the method to measure progress towards completion requires significant judgment and is based on the nature of the products or services to be provided. Generally, we use the time-elapsed measure of progress for performance obligations that include wireless, maintenance or subscription services. We believe this method best depicts the simultaneous transfer and consumption of the benefit based on our performance as these services are generally considered standby services. For professional services, we leverage an input methodology based on the number of hours worked on a project versus the total expected hours necessary to complete the project. Revenues are recognized proportionally as hours are incurred. The following table presents our revenues disaggregated by revenue type: For the Three Months Ended June 30, For the Six Months Ended June 30, (Dollars in thousands) 2021 2020 2021 2020 Wireless products and services $ 19,859 $ 21,078 $ 39,979 $ 42,465 License 818 749 2,325 1,704 Services 4,865 3,812 9,219 8,359 Equipment 482 601 1,098 1,327 Subscription 90 — 135 — Maintenance 9,609 9,499 19,003 19,151 Total revenue $ 35,723 $ 35,739 $ 71,759 $ 73,006 The U.S. was the only country that accounted for more than 10% of the Company’s total revenue for the three and six months ended June 30, 2021, and 2020. Revenue generated in the U.S. and internationally consisted of the following for the periods stated: For the Three Months Ended June 30, For the Six Months Ended June 30, (Dollars in thousands) 2021 2020 2021 2020 United States $ 34,799 $ 35,328 $ 69,973 $ 71,831 International 924 411 1,786 1,175 Total revenue $ 35,723 $ 35,739 $ 71,759 $ 73,006 Deferred Revenues Our deferred revenues represent payments made by, or due from, customers in advance of our performance. Changes in the balance of total deferred revenue during the six months ended June 30, 2021, are as follows: (Dollars in thousands) December 31, 2020 Additions Revenue Recognized June 30, 2021 Deferred Revenue $ 29,796 $ 29,171 $ (31,653) $ 27,314 During the six months ended June 30, 2021, the Company recognized $17.5 million related to amounts deferred as of December 31, 2020. Prepaid Commissions Our prepaid commissions represent payments made to employees in advance of our performance on the related underlying contracts. These costs have been incurred directly in relation to obtaining a contract. As such, these costs are amortized over the estimated period of benefit. Changes in the balance of total prepaid commissions during the six months ended June 30, 2021 are as follows: (Dollars in thousands) December 31, 2020 Additions Commissions Recognized June 30, 2021 Prepaid Commissions $ 2,290 $ 2,143 $ (2,349) $ 2,084 Prepaid commissions are included within Prepaid expenses on the Condensed Consolidated Balance Sheets and commissions expense is included within Selling and marketing on the Condensed Consolidated Statements of Operations. Remaining Performance Obligations The balance of remaining performance obligations at June 30, 2021, was $45.6 million. We expect to recognize approximately $33.2 million of our remaining performance obligations over the next 12 months, with the remaining balance recognized thereafter.

Leases

Leases	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Leases	LEASES We have operating lease arrangements for corporate offices, cellular towers, storage units and small building space. The building space is used to house infrastructure, such as transmitters, antennae and other various types of equipment for the Company’s wireless paging services. For leases with a term of 12 months or less, renewal terms are generally of an evergreen nature (either month-to-month or year-to-year). For leases with a term greater than 12 months, renewal terms are generally explicit and provide for one to five optional renewals consistent with the initial term. Many of our leases, with the exception of those for our corporate offices, include options to terminate the lease within one year. Variable lease payments, residual value guarantees or purchase options are not generally present in these leases. Lease costs are included in technology operations and general and administrative expenses on the Condensed Consolidated Statements of Operations. The following table presents lease costs disaggregated by type: For the Three Months Ended June 30, For the Six Months Ended June 30, (Dollars in thousands) 2021 2020 2021 2020 Operating lease cost $ 1,491 $ 1,392 $ 2,961 $ 2,774 Short-term lease cost 2,642 2,037 5,383 4,014 Short-term lease cost - related party (1) — 899 — 1,789 Total lease cost $ 4,133 $ 4,328 $ 8,344 $ 8,577 (1) A former member of our Board of Directors, who departed the Board during the third quarter of 2020, concurrently served as a director for an entity that leases transmission tower sites to the Company. The following table presents supplemental cash flow information: For the Six Months Ended June 30, (Dollars in thousands) 2021 2020 Cash paid for amounts included in the measurement of lease liabilities - operating leases $ 2,641 $ 2,711 The following table presents the weighted-average remaining lease term and discount rate: (Dollars in thousands) June 30, 2021 Weighted-average remaining lease term - operating leases (in years) 4.97 Weighted-average discount rate - operating leases 4.60% In March 2021, we relocated our corporate headquarters to office space located in Alexandria, Virginia, consisting of approximately 26,000 square feet of space under a lease that will expire on September 30, 2026. At that time, we recorded $4.4 million in a right-of-use asset and corresponding operating lease liability for this lease. Over the life of this lease, cash payments are expected to total approximately $4.9 million. Maturities of lease liabilities as of June 30, 2021, were as follows: For the Year Ended December 31, (Dollars in thousands) 2021 (remaining six months) $ 3,150 2022 4,849 2023 3,695 2024 2,815 2025 2,090 Thereafter 3,595 Total future lease payments 20,194 Imputed interest (2,158) Total $ 18,036

Consolidated Financial Statemen

Consolidated Financial Statement Components	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidated Financial Statement Components	CONSOLIDATED FINANCIAL STATEMENT COMPONENTS Depreciation, Amortization and Accretion Depreciation, amortization and accretion expenses consisted of the following for the periods stated: For the Three Months Ended June 30, For the Six Months Ended June 30, (Dollars in thousands) 2021 2020 2021 2020 Depreciation Leasehold improvements $ 18 $ 14 $ 34 $ 30 Asset retirement costs (22) (160) (44) (321) Paging and computer equipment 982 1,395 2,052 2,873 Furniture, fixtures and vehicles 62 81 120 151 Total depreciation 1,040 1,330 2,162 2,733 Amortization Intangible assets — 625 417 1,250 Capitalized software development costs 1,263 — 2,297 — Total amortization 1,263 625 2,714 1,250 Accretion 154 117 308 235 Total depreciation, amortization and accretion expense $ 2,457 $ 2,072 $ 5,184 $ 4,218 Accounts Receivable, Net Accounts receivable was recorded net of an allowance of $1.6 million and $1.7 million at June 30, 2021, and December 31, 2020, respectively. Accounts receivable, net includes $7.4 million and $7.0 million of unbilled receivables at June 30, 2021, and December 31, 2020, respectively. Unbilled receivables are defined as the Company's right to consideration in exchange for goods or services that we have transferred to the customer but have not yet billed for, generally as a result of contractual billing terms. Property and Equipment, Net Property and equipment, net consisted of the following as of the dates stated: (Dollars in thousands) Useful Life June 30, 2021 December 31, 2020 Leasehold improvements shorter of useful life or lease term $ 3,179 $ 3,628 Asset retirement costs 1-5 3,717 3,717 Paging and computer equipment 1-5 91,856 92,608 Furniture, fixtures and vehicles 3-5 3,518 3,517 Total property and equipment 102,270 103,470 Accumulated depreciation (94,409) (95,655) Total property and equipment, net $ 7,861 $ 7,815 Capitalized Software Development Capitalized software development costs at June 30, 2021, primarily consisted of costs related to the development of Spok Go. These costs are generally amortized on a straight-line basis over the estimated useful life of the asset, typically three years. The net consolidated balance of capitalized software development consisted of the following at June 30, 2021: (Dollars in thousands) Useful Life Gross Carrying Accumulated Net Balance Capitalized software development 3 $ 16,869 $ (3,370) $ 13,499 For the three and six months ended June 30, 2021, capitalized software development costs were $2.7 million and $5.6 million, respectively. For the three and six months ended June 30, 2020, capitalized software development costs were $3.6 million and $5.3 million, respectively.

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Net	6 Months Ended
	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, Net	GOODWILL AND INTANGIBLE ASSETS, NET Goodwill During the three months ended June 30, 2021, we performed a qualitative assessment of goodwill and determined that a triggering event had not occurred. While an impairment assessment is performed annually in the fourth quarter, the Company monitors its business environment for potential triggering events on a quarterly basis. There is potential for further impairment charges being recognized in future periods based on these ongoing assessments. Intangible Assets Amortizable intangible assets at June 30, 2021, related primarily to customer relationships that resulted from our acquisition of Amcom Software, Inc. in 2011. These intangibles, with an original gross carrying amount of $25.0 million, were being amortized over a period of 10 years and became fully amortized during the quarter ended March 31, 2021.

Asset Retirement Obligations

Asset Retirement Obligations	6 Months Ended
	Jun. 30, 2021
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	ASSET RETIREMENT OBLIGATIONS The components of the changes in the asset retirement obligation liabilities were: (Dollars in thousands) Short-Term Long-Term Total Balance at December 31, 2020 $ 335 $ 7,289 $ 7,624 Accretion (63) 371 308 Amounts paid (148) — (148) Reclassifications 195 (195) — Balance at June 30, 2021 $ 319 $ 7,465 $ 7,784 The short-term portion of the balance above is included within other current liabilities on the Condensed Consolidated Balance Sheet at June 30, 2021, and December 31, 2020. The cost associated with the estimated removal costs and timing refinements due to ongoing network rationalization activities is expected to accrete to a total liability of $9.3 million. The total estimated liability is based on the transmitter locations remaining after we have consolidated the number of networks we operate and assume the underlying leases continue to be renewed to that future date. Accretion expense related solely to asset retirement obligations and was recorded based on the interest method.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Stockholders' Equity	STOCKHOLDERS' EQUITY General 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. At June 30, 2021, and December 31, 2020, we had no stock options outstanding. At June 30, 2021, and December 31, 2020, there were 19,401,170 and 19,384,192 shares of common stock outstanding, respectively, and no shares of preferred stock outstanding. Dividends The following table details our cash dividends declared in 2021. Cash dividends paid as disclosed in the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2021, and 2020 include previously declared cash dividends on shares of vested restricted common stock ("restricted stock") issued to our non-executive directors and dividends related to vested restricted stock units ("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. (Dollars in thousands) Declaration Date Record Date Payment Date Per Share Amount Total Declared (1) February 17, 2021 March 16, 2021 March 30, 2021 $ 0.125 $ 2,553 April 28, 2021 May 25, 2021 June 24, 2021 0.125 2,553 Total $ 0.250 $ 5,106 (1) The total declared reflects the cash dividends declared in relation to common stock, deferred stock units ("DSUs") and unvested RSUs. On July 28, 2021, our Board of Directors declared a regular quarterly cash dividend of $0.125 per share of common stock with a record date of August 17, 2021, and a payment date of September 10, 2021. This cash dividend of approximately $2.4 million will be paid from available cash on hand. Net Income (Loss) per Common Share Basic net income (loss) per common share is computed on the basis of the weighted average common shares outstanding. Diluted net income (loss) 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 (loss) per common share were as follows for the periods stated: For the Three Months Ended June 30, For the Six Months Ended June 30, (in thousands, except for share and per share amounts) 2021 2020 2021 2020 Numerator: Net (loss) income $ (719) $ 3,759 $ (3,016) $ (780) Denominator: Basic weighted average common shares outstanding 19,395,364 19,016,853 19,335,081 18,987,469 Diluted weighted average common shares outstanding 19,395,364 19,115,148 19,335,081 18,987,469 Basic and diluted net (loss) income per common share $ (0.04) $ 0.20 $ (0.16) $ (0.04) For the three and six months ended June 30, 2021, and 2020 the following securities were excluded from the calculation of diluted shares outstanding as the effect would have been anti-dilutive: For the Three Months Ended June 30, For the Six Months Ended June 30, 2021 2020 2021 2020 Restricted stock units 181,592 — 318,248 232,825 Stock-Based Compensation Plans On March 23, 2012, our Board of Directors adopted the Spok Holdings, Inc. 2012 Equity Incentive Award Plan (the “2012 Equity Plan”) that our stockholders subsequently approved on May 16, 2012. A total of 2,194,986 shares of common stock were reserved for issuance under this plan. On April 29, 2020, our Board of Directors adopted the Spok Holdings, Inc. 2020 Equity Incentive Award Plan (the “2020 Equity Plan” and, together with the 2012 Equity Plan, the "Equity Plans") that our stockholders subsequently approved on July 28, 2020. As of that date, a total of 1,699,950 shares of common stock have been reserved for issuance under the 2020 Equity Plan, and no further grants will be made under the 2012 Equity Plan. However, the 2012 Equity Plan will continue to govern all outstanding awards thereunder. Awards under the 2020 Equity Plan may be in the form of stock options, restricted common stock, RSUs, performance awards, dividend equivalents, stock payment awards, deferred stock, DSUs, stock appreciation rights or other stock or cash-based awards. Restricted stock awards generally vest one year from the date of grant. Related dividends accumulate during the vesting period and are paid at the time of vesting. Contingent RSUs generally vest over a three-year performance period upon successful completion of the performance objectives. Non-contingent RSUs generally vest in thirds, annually, over a three-year period. Dividend equivalent rights generally accompany each RSU award and those rights accumulate and vest along with the underlying RSU. Dividend equivalent rights generally accompany each DSU award and are paid to participants in cash on the Company's applicable dividend payment date whether the DSU is vested or unvested. The dividend equivalent right associated with a DSU continues until delivery of the underlying shares of common stock is made. Payment of the underlying shares of common stock occurs at the earliest of a participant's separation from service, disability, death, or a change in control. Any shares subject to an award under the 2012 Equity Plan that are forfeited or expire will be available for the future grant of awards under the 2020 Equity Plan. As of June 30, 2021, the aggregate amount of unvested RSUs and restricted stock outstanding under the 2012 Equity Plan was 510,211. The following table summarizes the activities under the Equity Plans from January 1, 2021, through June 30, 2021: Activity Total equity securities available at January 1, 2021 1,699,314 RSU, DSU, and restricted stock awarded to eligible employees, net of forfeitures (520,359) Issuance of common stock in lieu of cash compensation (109,171) Total equity securities available at June 30, 2021 1,069,784 The following table details activities with respect to outstanding RSUs, DSUs, and restricted stock under the Equity Plans for the six months ended June 30, 2021: Shares Weighted- Unvested at January 1, 2021 636,722 $ 12.16 Granted 616,743 11.09 Vested (17,097) 11.16 Forfeited (96,384) 12.34 Unvested at June, 30 2021 1,139,984 $ 11.58 Of the 1,139,984 unvested RSUs, DSUs and restricted stock outstanding at June 30, 2021, 535,239 RSUs include contingent performance requirements for vesting purposes. At June 30, 2021, there was $7.1 million of unrecognized net compensation cost related to RSUs and restricted stock, which is expected to be recognized over a weighted average period of 1.9 years. For 2021, qualified employees are receiving a portion of their compensation in the form of shares of the Company's common stock in lieu of cash. These awards are made in advance on a quarterly basis and vest immediately. For the six months ended June 30, 2021, 109,171 shares of common stock were issued, with a weighted average grant date fair value of $11.35. Employee Stock Purchase Plan In 2016, our Board of Directors adopted the Spok Holdings, Inc. Employee Stock Purchase Plan ("ESPP") that our stockholders subsequently approved on July 25, 2016. A total of 250,000 shares of common stock were reserved for issuance under this plan. The ESPP allows employees to purchase shares of common stock at a discounted rate, subject to plan limitations. Under the ESPP, eligible participants can voluntarily elect to have contributions withheld from their pay for the duration of an offering period, subject to the ESPP limits. At the end of an offering period, contributions will be used to purchase the Company's common stock at a discount to the market price based on the first or last day of the offering period, whichever is lower. Participants are required to hold common stock for a minimum period of two years from the grant date. Participants will begin earning dividends on shares after the purchase date. Each offering period will generally last for no longer than six months. Once an offering period begins, participants cannot adjust their withholding amount. If a participant chooses to withdraw, any previously withheld funds will be returned to the participant, with no stock purchased, and that participant will be eligible to participate in the ESPP during the next offering period. If the participant terminates employment with the Company during the offering period, all contributions will be returned to the employee and no stock will be purchased. The Company uses the Black-Scholes model to calculate the fair value of the common stock to be purchased each offering period on the offer date. The Black-Scholes model requires the use of estimates for the expected term, the expected volatility of the underlying common stock over the expected term, the risk-free interest rate and the expected dividend payment. For the three months ended June 30, 2021, and 2020, employees purchased 16,015 and 18,586 shares of the Company's common stock for a total cost of $0.1 million and $0.2 million, respectively. The following table summarizes the activities under the ESPP from January 1, 2021, through June 30, 2021: Activity Total ESPP equity securities available at January 1, 2021 149,199 ESPP common stock purchased by eligible employees (16,015) Total ESPP securities available at June 30, 2021 133,184 Amounts withheld from participants will be classified as Accrued compensation and benefits on the Condensed Consolidated Balance Sheets until funds are used to purchase shares. This liability amount is immaterial to the Condensed Consolidated Financial Statements. Stock-Based Compensation Expense We record all stock-based compensation, which consist of RSUs, DSUs, restricted stock, equity in lieu of salary, and the option to purchase common stock under the ESPP, at fair value as of the grant date. Stock-based compensation expense is recognized based on a straight-line amortization basis over the respective service period. Forfeitures and withdrawals are accounted for as incurred. The following table reflects the items for stock-based compensation expense on the Condensed Consolidated Statements of Operations for the periods stated: For the Three Months Ended June 30, For the Six Months Ended June 30, (Dollars in thousands) 2021 2020 2021 2020 Performance-based RSUs $ 182 $ 516 $ 755 $ 860 Time-based RSUs, DSUs and restricted stock 958 815 1,981 1,628 Equity in lieu of salary 618 — 1,240 — ESPP 23 31 44 56 Total stock-based compensation $ 1,781 $ 1,362 $ 4,020 $ 2,544

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The Coronavirus Aid, Relief, and Economic Security ("CARES") Act was signed into law on March 27, 2020. The CARES Act was initiated to provide stimulus and relief in response to the coronavirus disease 2019 ("COVID-19") pandemic and resulting economic collapse. While the CARES Act provides a number of potential benefits to companies, the Company has made use of the following provisions: • Payroll Tax Deferral - Allows for the deferral of payment on the Company's share of the 6.2% Social Security tax on wages paid beginning on March 27, 2020 and ending on December 31, 2020. Deferred amounts are payable in two installments, with 50% of such taxes due on December 31, 2021, and the remainder due on December 31, 2022. This resulted in a total deferral of approximately $2.1 million of payroll taxes under this provision, as of December 31, 2020. We do not anticipate additional deferrals in 2021. • Employee Retention Credits - Allows for a refundable tax credit for the Company's share of the 6.2% Social Security tax on wages. This tax credit applies to the first $10,000 in qualified wages paid to each employee commencing on March 13, 2020. To be eligible, the Company must (i) have had operations fully or partially suspended because of a shut-down order from a governmental authority related to COVID-19, or (ii) have had gross receipts decline by more than 50% in a calendar quarter when compared to the same quarter in 2019. Qualified wages are limited to wages paid to employees who were not providing services due to the COVID-19 pandemic. This resulted in a total claim of approximately $1.3 million in employee retention credits under this provision, as of December 31, 2020. We do not anticipate additional material employee retention credits in 2021. • Alternative Minimum Tax ("AMT") Credit - Allows for an immediate refund of all refundable AMT credits resulting from passage of the Tax Cuts and Jobs Act of 2017. This resulted in accelerated collection of approximately $1.3 million of other current assets which was received during the third quarter of 2020. Spok files a consolidated U.S. federal income tax return and income tax returns in various state, local and foreign jurisdictions as required. Our quarterly tax provision and our quarterly estimate of our annual effective tax rate are subject to significant variation due to several factors, including variability in accurately predicting our pre-tax and taxable income and loss and the mix of jurisdictions to which they relate, changes in how we do business, changes in our stock price, foreign currency gains (losses), tax law developments (including changes in statutes, regulations, case law, and administrative practices), and relative changes of expenses or losses for which tax benefits are not recognized. Additionally, our effective tax rate can be more or less volatile based on the amount of pre-tax income or loss. For example, the impact of discrete items and non-deductible expenses on our effective tax rate is greater when our pre-tax income is lower. For 2021, the anticipated effective income tax rate is expected to continue to differ from the federal statutory rate of 21% primarily due to the effect of state income taxes, research and development credits and related valuation allowance, permanent differences between book and taxable income, and certain discrete items. We had total net deferred income tax assets ("DTAs") of $26.0 million and $25.8 million at June 30, 2021, and December 31, 2020, respectively. We had a valuation allowance of $23.1 million and $22.1 million at June 30, 2021, and December 31, 2020, respectively. We assess the recoverability of our deferred income tax assets, which represent the tax benefits of future tax deductions, based on available positive and negative evidence and by considering the adequacy of future taxable income from all sources, including prudent and feasible tax planning strategies. This assessment is required to determine whether, based on all available evidence, it is "more likely than not" (meaning a probability of greater than 50%) that all or some portion of the deferred income tax assets will be realized in future periods. During the fourth quarter of each year, we update our multi-year forecast of taxable income for our operations, which assists in analyzing the recoverability of our DTAs. Deferred income tax assets which are not currently covered by a valuation allowance are those that are indefinite-lived, or whose temporary differences would reverse in the future and may result in the creation of an indefinite-lived deferred income tax asset, which we consider to be realized through future taxable income despite near term uncertainties. The amount of deferred income tax assets considered realizable, however, could be adjusted in the future if objective negative evidence in the form of cumulative losses is no longer present, additional weight is given to subjective evidence such as our projections for future profitability and growth, or other relevant factors arise.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIESThere have been no material changes during the six months ended June 30, 2021, to the commitments and contingencies previously reported in the 2020 Annual Report.

Related Parties

Related Parties	6 Months Ended
	Jun. 30, 2021
Related Party Transactions [Abstract]
Related Parties	RELATED PARTIES A member of our Board of Directors, who was appointed at the beginning of 2020, serves as Chief Information Officer for an entity that is also a customer of the Company. For both the three months ended June 30, 2021, and 2020, we recognized revenues of $0.2 million related to contracts from the entity at which the individual is employed. For the six months ended June 30, 2021, and 2020, we recognized revenues of $0.4 million and $0.3 million, respectively related to the contracts from the entity at which the individual is employed.

Organization and Significant _2

Organization and Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation 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. Our Condensed Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) and the rules and regulations of the United States Securities and Exchange Commission (the “SEC”). In management's opinion, the unaudited Condensed Consolidated Financial Statements include all adjustments and accruals that are necessary for the presentation of the results of all interim periods reported herein and all such adjustments are of a normal, recurring nature. Amounts shown on the Condensed Consolidated Statements of Operations within the operating expense categories of Cost of revenue; Research and development; Technology operations; Selling and marketing; and General and administrative are recorded exclusive of depreciation, amortization and accretion. Certain immaterial prior period amounts in the Condensed Consolidated Financial Statements have been reclassified to conform to the current period's presentation. These reclassifications had no effect on the reported results of operations or the statement of financial position. The financial information included herein, other than the Condensed Consolidated Balance Sheet as of December 31, 2020, is unaudited. The Condensed Consolidated Balance Sheet as of December 31, 2020, 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, 2020. 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, 2020 (the “2020 Annual Report”). The Condensed Consolidated Statements of Operations for the interim periods presented are not necessarily indicative of the results that may be expected for a full year.
Use of Estimates	Use of Estimates The preparation of these Condensed Consolidated Financial Statements requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosures. On an ongoing basis, we evaluate estimates and assumptions, including, but not limited to, those related to the impairment of long-lived assets, intangible assets subject to amortization and goodwill, accounts receivable allowances, revenue recognition, determining the standalone selling price of performance obligations, variable consideration, depreciation expense, asset retirement obligations, income taxes and capitalization of software costs. We base our estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.
Recent Accounting Standards	RECENT ACCOUNTING STANDARDS The Company considers the applicability and impact of all Accounting Standards Updates ("ASUs") issued by the Financial Accounting Standards Board ("FASB"). The Company has determined that all recent ASUs issued by the FASB are either not applicable or are expected to have minimal impact on the Company's Condensed Consolidated Financial Statements.

Revenue, Deferred Revenue And_2

Revenue, Deferred Revenue And Prepaid Commissions (Tables)	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Schedule of Revenue	The following table presents our revenues disaggregated by revenue type: For the Three Months Ended June 30, For the Six Months Ended June 30, (Dollars in thousands) 2021 2020 2021 2020 Wireless products and services $ 19,859 $ 21,078 $ 39,979 $ 42,465 License 818 749 2,325 1,704 Services 4,865 3,812 9,219 8,359 Equipment 482 601 1,098 1,327 Subscription 90 — 135 — Maintenance 9,609 9,499 19,003 19,151 Total revenue $ 35,723 $ 35,739 $ 71,759 $ 73,006 For the Three Months Ended June 30, For the Six Months Ended June 30, (Dollars in thousands) 2021 2020 2021 2020 United States $ 34,799 $ 35,328 $ 69,973 $ 71,831 International 924 411 1,786 1,175 Total revenue $ 35,723 $ 35,739 $ 71,759 $ 73,006
Schedule of Deferred Revenue	Changes in the balance of total deferred revenue during the six months ended June 30, 2021, are as follows: (Dollars in thousands) December 31, 2020 Additions Revenue Recognized June 30, 2021 Deferred Revenue $ 29,796 $ 29,171 $ (31,653) $ 27,314
Schedule of Deferred Commissions	Changes in the balance of total prepaid commissions during the six months ended June 30, 2021 are as follows: (Dollars in thousands) December 31, 2020 Additions Commissions Recognized June 30, 2021 Prepaid Commissions $ 2,290 $ 2,143 $ (2,349) $ 2,084

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Schedule of Lease Costs	The following table presents lease costs disaggregated by type: For the Three Months Ended June 30, For the Six Months Ended June 30, (Dollars in thousands) 2021 2020 2021 2020 Operating lease cost $ 1,491 $ 1,392 $ 2,961 $ 2,774 Short-term lease cost 2,642 2,037 5,383 4,014 Short-term lease cost - related party (1) — 899 — 1,789 Total lease cost $ 4,133 $ 4,328 $ 8,344 $ 8,577 (1) A former member of our Board of Directors, who departed the Board during the third quarter of 2020, concurrently served as a director for an entity that leases transmission tower sites to the Company. The following table presents supplemental cash flow information: For the Six Months Ended June 30, (Dollars in thousands) 2021 2020 Cash paid for amounts included in the measurement of lease liabilities - operating leases $ 2,641 $ 2,711 The following table presents the weighted-average remaining lease term and discount rate: (Dollars in thousands) June 30, 2021 Weighted-average remaining lease term - operating leases (in years) 4.97 Weighted-average discount rate - operating leases 4.60%
Schedule of Maturities of Lease Liabilities	Maturities of lease liabilities as of June 30, 2021, were as follows: For the Year Ended December 31, (Dollars in thousands) 2021 (remaining six months) $ 3,150 2022 4,849 2023 3,695 2024 2,815 2025 2,090 Thereafter 3,595 Total future lease payments 20,194 Imputed interest (2,158) Total $ 18,036

Consolidated Financial Statem_2

Consolidated Financial Statement Components (Tables)	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [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 June 30, For the Six Months Ended June 30, (Dollars in thousands) 2021 2020 2021 2020 Depreciation Leasehold improvements $ 18 $ 14 $ 34 $ 30 Asset retirement costs (22) (160) (44) (321) Paging and computer equipment 982 1,395 2,052 2,873 Furniture, fixtures and vehicles 62 81 120 151 Total depreciation 1,040 1,330 2,162 2,733 Amortization Intangible assets — 625 417 1,250 Capitalized software development costs 1,263 — 2,297 — Total amortization 1,263 625 2,714 1,250 Accretion 154 117 308 235 Total depreciation, amortization and accretion expense $ 2,457 $ 2,072 $ 5,184 $ 4,218
Property, Plant and Equipment	Property and equipment, net consisted of the following as of the dates stated: (Dollars in thousands) Useful Life June 30, 2021 December 31, 2020 Leasehold improvements shorter of useful life or lease term $ 3,179 $ 3,628 Asset retirement costs 1-5 3,717 3,717 Paging and computer equipment 1-5 91,856 92,608 Furniture, fixtures and vehicles 3-5 3,518 3,517 Total property and equipment 102,270 103,470 Accumulated depreciation (94,409) (95,655) Total property and equipment, net $ 7,861 $ 7,815
Schedule Of Capitalized Computer Software	The net consolidated balance of capitalized software development consisted of the following at June 30, 2021: (Dollars in thousands) Useful Life Gross Carrying Accumulated Net Balance Capitalized software development 3 $ 16,869 $ (3,370) $ 13,499

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	6 Months Ended
	Jun. 30, 2021
Asset Retirement Obligation Disclosure [Abstract]
Changes in Asset Retirement Obligation Liabilities	The components of the changes in the asset retirement obligation liabilities were: (Dollars in thousands) Short-Term Long-Term Total Balance at December 31, 2020 $ 335 $ 7,289 $ 7,624 Accretion (63) 371 308 Amounts paid (148) — (148) Reclassifications 195 (195) — Balance at June 30, 2021 $ 319 $ 7,465 $ 7,784

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Cash Dividends Declared	The following table details our cash dividends declared in 2021. Cash dividends paid as disclosed in the Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2021, and 2020 include previously declared cash dividends on shares of vested restricted common stock ("restricted stock") issued to our non-executive directors and dividends related to vested restricted stock units ("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. (Dollars in thousands) Declaration Date Record Date Payment Date Per Share Amount Total Declared (1) February 17, 2021 March 16, 2021 March 30, 2021 $ 0.125 $ 2,553 April 28, 2021 May 25, 2021 June 24, 2021 0.125 2,553 Total $ 0.250 $ 5,106 (1) The total declared reflects the cash dividends declared in relation to common stock, deferred stock units ("DSUs") and unvested RSUs.
Basic and Diluted Net Income (Loss) Per Common Shares	The components of basic and diluted net income (loss) per common share were as follows for the periods stated: For the Three Months Ended June 30, For the Six Months Ended June 30, (in thousands, except for share and per share amounts) 2021 2020 2021 2020 Numerator: Net (loss) income $ (719) $ 3,759 $ (3,016) $ (780) Denominator: Basic weighted average common shares outstanding 19,395,364 19,016,853 19,335,081 18,987,469 Diluted weighted average common shares outstanding 19,395,364 19,115,148 19,335,081 18,987,469 Basic and diluted net (loss) income per common share $ (0.04) $ 0.20 $ (0.16) $ (0.04)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	For the three and six months ended June 30, 2021, and 2020 the following securities were excluded from the calculation of diluted shares outstanding as the effect would have been anti-dilutive: For the Three Months Ended June 30, For the Six Months Ended June 30, 2021 2020 2021 2020 Restricted stock units 181,592 — 318,248 232,825
Activities Under Equity Plan	The following table summarizes the activities under the Equity Plans from January 1, 2021, through June 30, 2021: Activity Total equity securities available at January 1, 2021 1,699,314 RSU, DSU, and restricted stock awarded to eligible employees, net of forfeitures (520,359) Issuance of common stock in lieu of cash compensation (109,171) Total equity securities available at June 30, 2021 1,069,784 The following table summarizes the activities under the ESPP from January 1, 2021, through June 30, 2021: Activity Total ESPP equity securities available at January 1, 2021 149,199 ESPP common stock purchased by eligible employees (16,015) Total ESPP securities available at June 30, 2021 133,184
Summary of Outstanding RSUs	The following table details activities with respect to outstanding RSUs, DSUs, and restricted stock under the Equity Plans for the six months ended June 30, 2021: Shares Weighted- Unvested at January 1, 2021 636,722 $ 12.16 Granted 616,743 11.09 Vested (17,097) 11.16 Forfeited (96,384) 12.34 Unvested at June, 30 2021 1,139,984 $ 11.58
Stock Based Compensation Expense	The following table reflects the items for stock-based compensation expense on the Condensed Consolidated Statements of Operations for the periods stated: For the Three Months Ended June 30, For the Six Months Ended June 30, (Dollars in thousands) 2021 2020 2021 2020 Performance-based RSUs $ 182 $ 516 $ 755 $ 860 Time-based RSUs, DSUs and restricted stock 958 815 1,981 1,628 Equity in lieu of salary 618 — 1,240 — ESPP 23 31 44 56 Total stock-based compensation $ 1,781 $ 1,362 $ 4,020 $ 2,544

Revenue, Deferred Revenue And_3

Revenue, Deferred Revenue And Prepaid Commissions - Additional Information and Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)revenue_component	Jun. 30, 2020USD ($)
Revenues from External Customers and Long-Lived Assets
Total revenue	$ 35,723	$ 35,739	$ 71,759	$ 73,006
Deferred revenue recognized from previous period			17,500
United States
Revenues from External Customers and Long-Lived Assets
Total revenue	34,799	35,328	69,973	71,831
International
Revenues from External Customers and Long-Lived Assets
Total revenue	924	411	1,786	1,175
Wireless products and services
Revenues from External Customers and Long-Lived Assets
Total revenue	19,859	21,078	39,979	42,465
License
Revenues from External Customers and Long-Lived Assets
Total revenue	818	749	2,325	1,704
Services
Revenues from External Customers and Long-Lived Assets
Total revenue	4,865	3,812	9,219	8,359
Equipment
Revenues from External Customers and Long-Lived Assets
Total revenue	482	601	1,098	1,327
Subscription
Revenues from External Customers and Long-Lived Assets
Total revenue	90	0	$ 135	0
Maintenance
Revenues from External Customers and Long-Lived Assets
Typical duration of revenue recognition			Maintenance revenue is for ongoing support of our software solutions or related equipment and access to when-and-if available software updates.
Total revenue	$ 9,609	$ 9,499	$ 19,003	$ 19,151
Wireless products and services
Revenues from External Customers and Long-Lived Assets
Revenue primary component | revenue_component			2
Software
Revenues from External Customers and Long-Lived Assets
Revenue primary component | revenue_component			2

Revenue, Deferred Revenue And_4

Revenue, Deferred Revenue And Prepaid Commissions - Deferred Revenues (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)
Contract With Customer, Asset And Liability [Roll Forward]
December 31, 2020	$ 29,796
Additions	29,171
Revenue Recognized	(31,653)
June 30, 2021	$ 27,314

Revenue, Deferred Revenue And_5

Revenue, Deferred Revenue And Prepaid Commissions - Prepaid Commissions (Details) - Prepaid Commissions $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)
Capitalized Contract Cost
December 31, 2020	$ 2,290
Additions	2,143
Commissions Recognized	(2,349)
June 30, 2021	$ 2,084

Revenue, Deferred Revenue And_6

Revenue, Deferred Revenue And Prepaid Commissions - Remaining Performance Obligations (Details) $ in Millions	Jun. 30, 2021USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 45.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 33.2
Remaining performance obligation, period	12 months

Leases - Additional Information

Leases - Additional Information (Details) ft² in Thousands, $ in Thousands	1 Months Ended	6 Months Ended
	Mar. 31, 2021ft²	Jun. 30, 2021USD ($)renewal	Dec. 31, 2020USD ($)
Lessee, Lease, Description [Line Items]
Termination term		1 year
Area of lease | ft²	26
Operating lease right-of-use assets		$ 16,769	$ 14,016
Lease liability		18,036
Expected cash payments		20,194
Building
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets		4,400
Lease liability		4,400
Expected cash payments		$ 4,900
Minimum
Lessee, Lease, Description [Line Items]
Number of renewal options | renewal		1
Maximum
Lessee, Lease, Description [Line Items]
Number of renewal options | renewal		5

Leases - Lease Costs (Details)

Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating lease cost	$ 1,491	$ 1,392	$ 2,961	$ 2,774
Short-term lease cost	2,642	2,037	5,383	4,014
Short-term lease cost - related party	0	899	0	1,789
Total lease cost	$ 4,133	$ 4,328	8,344	8,577
Cash paid for amounts included in the measurement of lease liabilities - operating leases			$ 2,641	$ 2,711
Weighted-average remaining lease term - operating leases (in years)	4 years 11 months 19 days		4 years 11 months 19 days
Weighted-average discount rate - operating leases	4.60%		4.60%

Leases - Lease Maturities (Deta

Leases - Lease Maturities (Details) $ in Thousands	Jun. 30, 2021USD ($)
Leases [Abstract]
2021 (remaining six months)	$ 3,150
2022	4,849
2023	3,695
2024	2,815
2025	2,090
Thereafter	3,595
Total future lease payments	20,194
Imputed interest	(2,158)
Total	$ 18,036

Consolidated Financial Statem_3

Consolidated Financial Statement Components - Depreciation, Amortization and Accretion (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Property, Plant and Equipment [Line Items]
Depreciation	$ 1,040	$ 1,330	$ 2,162	$ 2,733
Intangible assets	0	625	417	1,250
Capitalized software development costs	1,263	0	2,297	0
Total amortization	1,263	625	2,714	1,250
Accretion	154	117	308	235
Total depreciation, amortization and accretion expense	2,457	2,072	5,184	4,218
Leasehold improvements
Property, Plant and Equipment [Line Items]
Depreciation	18	14	34	30
Asset retirement costs
Property, Plant and Equipment [Line Items]
Depreciation	22	160	44	321
Paging and computer equipment
Property, Plant and Equipment [Line Items]
Depreciation	982	1,395	2,052	2,873
Furniture, fixtures and vehicles
Property, Plant and Equipment [Line Items]
Depreciation	$ 62	$ 81	$ 120	$ 151

Consolidated Financial Statem_4

Consolidated Financial Statement Components - Accounts Receivable, Net (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Allowance for doubtful accounts receivable	$ 1.6	$ 1.7
Unbilled receivables	$ 7.4	$ 7

Consolidated Financial Statem_5

Consolidated Financial Statement Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Useful Life (In Years)	3 years
Total property and equipment	$ 102,270	$ 103,470
Accumulated depreciation	(94,409)	(95,655)
Total property and equipment, net	7,861	7,815
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	3,179	3,628
Asset retirement costs
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 3,717	3,717
Asset retirement costs | Minimum
Property, Plant and Equipment [Line Items]
Useful Life (In Years)	1 year
Asset retirement costs | Maximum
Property, Plant and Equipment [Line Items]
Useful Life (In Years)	5 years
Paging and computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 91,856	92,608
Paging and computer equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Life (In Years)	1 year
Paging and computer equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Life (In Years)	5 years
Furniture, fixtures and vehicles
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 3,518	$ 3,517
Furniture, fixtures and vehicles | Minimum
Property, Plant and Equipment [Line Items]
Useful Life (In Years)	3 years
Furniture, fixtures and vehicles | Maximum
Property, Plant and Equipment [Line Items]
Useful Life (In Years)	5 years

Consolidated Financial Statem_6

Consolidated Financial Statement Components - Capitalized Software Development (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Useful life			3 years
Gross Carrying Amount	$ 16,869		$ 16,869
Accumulated Amortization	(3,370)		(3,370)
Capitalized software development, net	13,499		13,499		$ 10,179
Capitalized software development costs, additions	$ 2,700	$ 3,600	$ 5,600	$ 5,300
Capitalized software
Property, Plant and Equipment [Line Items]
Useful life			3 years

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, Net - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Gross Carrying Amount	$ 25
Useful Life (In Years)	10 years

Asset Retirement Obligations -

Asset Retirement Obligations - Changes in Asset Retirement Obligation Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at December 31, 2020	$ 7,624
Accretion	308
Amounts paid	(148)
Reclassifications	0
Balance at June 30, 2021	7,784
Short-Term Portion
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at December 31, 2020	335
Accretion	(63)
Amounts paid	(148)
Reclassifications	195
Balance at June 30, 2021	319
Long-Term Portion
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at December 31, 2020	7,289
Accretion	371
Amounts paid	0
Reclassifications	(195)
Balance at June 30, 2021	$ 7,465

Asset Retirement Obligations _2

Asset Retirement Obligations - Additional Information (Details) $ in Millions	Jun. 30, 2021USD ($)
Asset Retirement Obligation Disclosure [Abstract]
Estimated liability	$ 9.3

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jul. 28, 2021	Dec. 31, 2020	Jul. 28, 2020	May 16, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized (shares)	75,000,000		75,000,000
Common stock par value (usd per share)	$ 0.0001		$ 0.0001
Preferred stock authorized (shares)	25,000,000		25,000,000
Preferred stock par value (usd per share)	$ 0.0001		$ 0.0001
Options outstanding (shares)	0		0		0
Common stock outstanding (shares)	19,401,170		19,401,170		19,384,192
Preferred stock outstanding (shares)	0		0		0
Issuance of common stock under the employee stock purchase plan (shares)	16,015	18,586
Issuance of common stock under the employee stock purchase plan	$ 0.1	$ 0.2
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend rate (usd per share)				$ 0.125
Dividends declared				$ 2.4
Unvested RSUs, DSUs and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, nonvested (shares)	1,139,984		1,139,984		636,722
Shares issued, weighted average grant date fair value (usd per share)			$ 11.09
2012 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)							2,194,986
Shares issued (shares)			109,171
2012 Equity Plan | Contingent RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, nonvested (shares)	535,239		535,239
2012 Equity Plan | Restricted Stock and Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, nonvested (shares)	510,211		510,211
Compensation cost not yet recognized, share-based awards other than options	$ 7.1		$ 7.1
Weighted-average period over which cost is expected to be recognized			1 year 10 months 24 days
2012 Equity Plan | Share-based Payment Arrangement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued, weighted average grant date fair value (usd per share)			$ 11.35
2020 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)						1,699,950
2020 Equity Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year
2020 Equity Plan | Contingent RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
2020 Equity Plan | Non-contingent RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	250,000		250,000
Award required holding period			2 years
ESPP | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering period, maximum			6 months

Stockholders' Equity - Cash Div

Stockholders' Equity - Cash Dividends Declared to Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Per Share Amount (usd per share)	$ 0.125		$ 0.125		$ 0.250	$ 0.250
Total Declared	$ 2,553	$ 2,553	$ 2,491	$ 2,488
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Per Share Amount (usd per share)					$ 0.250
Total Declared					$ 5,106
Common Stock | Installment One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Declaration Date					Feb. 17, 2021
Record Date					Mar. 16, 2021
Payment Date					Mar. 30, 2021
Per Share Amount (usd per share)					$ 0.125
Total Declared					$ 2,553
Common Stock | Installment Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Declaration Date					Apr. 28, 2021
Record Date					May 25, 2021
Payment Date					Jun. 24, 2021
Per Share Amount (usd per share)					$ 0.125
Total Declared					$ 2,553

Stockholders' Equity - Basic an

Stockholders' Equity - Basic and Diluted Net Income (Loss) Per Common Shares (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net (loss) income	$ (719)	$ (2,297)	$ 3,759	$ (4,539)	$ (3,016)	$ (780)
Denominator:
Basic weighted average common shares outstanding (in shares)	19,395,364		19,016,853		19,335,081	18,987,469
Diluted weighted average common shares outstanding (in shares)	19,395,364		19,115,148		19,335,081	18,987,469
Basic net loss per common share (usd per share)	$ (0.04)		$ 0.20		$ (0.16)	$ (0.04)
Diluted net loss per common share (usd per share)	$ (0.04)		$ 0.20		$ (0.16)	$ (0.04)

Stockholders' Equity - Antidilu

Stockholders' Equity - Antidilutive Securities Excluded from Computation of Net Income Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity [Abstract]
Antidilutive securities restricted stock units (in shares)	181,592	0	318,248	232,825

Stockholders' Equity - Activiti

Stockholders' Equity - Activities Under Equity Plan (Details)	6 Months Ended
	Jun. 30, 2021shares
2012 Equity Plan
Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]
RSU, DSU, and restricted stock awarded to eligible employees (shares)	(520,359)
Issuance of common stock in lieu of cash compensation (shares)	(109,171)
ESPP
Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]
Shares available for grant (shares)	149,199
ESPP common stock purchased by eligible employees (shares)	(16,015)
Shares available for grant (shares)	133,184
Unvested RSUs, DSUs and Restricted Stock
Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]
RSU, DSU, and restricted stock awarded to eligible employees (shares)	(616,743)
Unvested RSUs, DSUs and Restricted Stock | 2012 Equity Plan
Share-based Compensation Arrangement By Share-based Payment Award, Shares Authorized [Roll Forward]
Shares available for grant (shares)	1,699,314
Shares available for grant (shares)	1,069,784

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Outstanding RSUs (Details) - Unvested RSUs, DSUs and Restricted Stock	6 Months Ended
	Jun. 30, 2021$ / sharesshares
Shares
Beginning Balance (shares) | shares	636,722
Granted (shares) | shares	616,743
Vested (shares) | shares	(17,097)
Forfeited (shares) | shares	(96,384)
Ending Balance (shares) | shares	1,139,984
Weighted- Average Grant Date Fair Value
Beginning Balance (usd per share) | $ / shares	$ 12.16
Granted (usd per share) | $ / shares	11.09
Vested (usd per share) | $ / shares	11.16
Forfeited (usd per share) | $ / shares	12.34
Ending Balance (usd per share) | $ / shares	$ 11.58

Stockholders' Equity - Stock-ba

Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	$ 1,781	$ 1,362	$ 4,020	$ 2,544
Performance-based RSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	182	516	755	860
Time-based RSUs, DSUs and restricted stock
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	958	815	1,981	1,628
Equity in lieu of salary
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	618	0	1,240	0
ESPP
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	$ 23	$ 31	$ 44	$ 56

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Jun. 30, 2021	Sep. 30, 2020
Income Tax Contingency [Line Items]
Deferred income tax assets, net	$ 25,826	$ 25,969
Valuation allowance	22,100	$ 23,100
CARES Act
Income Tax Contingency [Line Items]
Deferred payroll taxes, CARES Act	2,100
Tax credits	$ 1,300
Alternative minimum tax credits received			$ 1,300

Related Parties (Details)

Related Parties (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Director
Related Party Transaction [Line Items]
Revenue from related parties	$ 0.2	$ 0.2	$ 0.4	$ 0.3