EX-99.1 2 q42018financialresults-ear.htm EXHIBIT 99.1 Exhibit


Tenable Announces Fourth Quarter and Full Year 2018 Financial Results
Fourth quarter revenue of $75.2 million, up 39% year-over-year.
Fourth quarter calculated current billings of $97.3 million, up 36% year-over-year.
Added 66 net new six-figure enterprise platform customers in fourth quarter, most in Tenable history.
COLUMBIA, Maryland, February 5, 2019 — Tenable Holdings, Inc. (“Tenable”) (Nasdaq: TENB), the Cyber Exposure company, today announced financial results for the quarter and year ended December 31, 2018.
“The fourth quarter was a great finish to 2018, with full year revenue growth of 42% year-over-year," said Amit Yoran, Chairman and CEO of Tenable. “Digital transformation continues to elevate the importance of and investment in Cyber Exposure. Understanding and reducing Cyber Exposure remains a strategic C-suite and Board level issue and enterprise organizations are increasingly recognizing Tenable as a strategic and foundational component of this effort.”
Fourth Quarter 2018 Financial Highlights
Revenue was $75.2 million, representing a 39% increase year-over-year.
Calculated current billings was $97.3 million, representing a 36% increase year-over-year.
GAAP loss from operations was $19.6 million, compared to a loss of $11.6 million in the fourth quarter of 2017.
Non-GAAP loss from operations was $10.8 million, compared to a loss of $9.2 million in the fourth quarter of 2017.
GAAP net loss was $19.6 million, compared to a loss of $11.7 million in the fourth quarter of 2017.
GAAP net loss per share was $0.21, compared to a loss of $0.52 in the fourth quarter of 2017.
Non-GAAP net loss was $10.9 million, compared to a loss of $9.3 million in the fourth quarter of 2017.
Pro forma non-GAAP net loss per share was $0.12, compared to a loss per share of $0.12 in the fourth quarter of 2017.
Cash and cash equivalents and short-term investments were $283.2 million as of December 31, 2018.
Net cash used in operating activities was $1.6 million, compared to $5.5 million used in the fourth quarter of 2017.
Free cash flow was $(3.1) million, compared to $(6.6) million in the fourth quarter of 2017.
Full Year 2018 Financial Highlights
Revenue was $267.4 million, representing a 42% increase year-over-year.
Calculated current billings was $326.1 million, representing a 38% increase year-over-year.
GAAP loss from operations was $72.6 million, compared to a loss of $40.8 million in 2017.
Non-GAAP loss from operations was $49.1 million, compared to a loss of $32.4 million in 2017.
GAAP net loss was $73.5 million, compared to a loss of $41.0 million in 2017.
GAAP net loss per share was $1.38, compared to a loss of $1.88 in 2017.
Non-GAAP net loss was $50.3 million, compared to a loss of $32.7 million in 2017.
Pro forma non-GAAP net loss per share was $0.59, compared to a loss per share of $0.42 in 2017.
Net cash used in operating activities was $2.6 million, compared to $6.3 million used in 2017.
Free cash flow was $(8.3) million, compared to $(9.0) million in 2017.
Fourth Quarter 2018 and Recent Business Highlights
Added 337 new logo enterprise platform customers and 66 net new six-figure customers, the largest addition of six-figure customers in Tenable history.
Released the Vulnerability Intelligence Report from Tenable Research, which identified that enterprises are triaging over 100 critical vulnerabilities every day, on average. This provides evidence that prioritization based solely on the industry standard common vulnerability scoring system (CVSS) leaves organizations unable to effectively and confidently focus on which vulnerabilities require immediate action.

1



Announced Predictive Prioritization, a novel innovation for both Tenable.scTM and Tenable.io®, which is designed to enable organizations to focus on the vulnerabilities that will most likely be leveraged by threat actors and therefore pose the greatest business risk.
Integrated with the Amazon Web Services (AWS) Security Hub to provide users with a comprehensive view of their high-priority security alerts and compliance status by aggregating, organizing, and prioritizing alerts from multiple AWS services. Also announced that Tenable.io is now available on the AWS marketplace.
Released the "Measuring and Managing the Cyber Risks to Business Operations Report," an independent study conducted by Ponemon Institute. It found that 60% of organizations globally had suffered two or more business-disrupting cyber events in the last 24 months, yet the inability to quantify the business cost of cyber risks leaves most boards of directors unable to prioritize their strategic response.
Financial Outlook
For the first quarter of 2019, we currently expect:
Revenue in the range of $77.5 million to $78.5 million.
Non-GAAP loss from operations in the range of $17.0 million to $16.0 million.
Non-GAAP net loss in the range of $18.0 million to $17.0 million.
Non-GAAP net loss per share in the range of $0.19 to $0.18, assuming 93.2 million weighted average shares outstanding.
For the year ending December 31, 2019, we currently expect:
Revenue in the range of $338.0 million to $343.0 million.
Calculated current billings in the range of $410.0 million to $415.0 million.
Non-GAAP loss from operations in the range of $60.0 million to $55.0 million.
Non-GAAP net loss in the range of $59.0 million to $54.0 million.
Non-GAAP net loss per share in the range of $0.62 to $0.57, assuming 95.1 million weighted average shares outstanding.
Conference Call Information
Tenable will host a conference call at 4:30 p.m Eastern Time to discuss its financial results. The conference call can be accessed at 877-407-9716 (U.S.) and 201-493-6779 (international). A live webcast of the event will be available on the Tenable Investor Relations website at https://investors.tenable.com. A replay of the webcast will be available until February 19, 2019.
About Tenable
Tenable® is the Cyber Exposure company. Over 27,000 organizations around the globe rely on Tenable to understand and reduce cyber risk. As the creator of Nessus®, Tenable extended its expertise in vulnerabilities to deliver the world’s first platform to see and secure any digital asset on any computing platform. Tenable customers include more than 50 percent of the Fortune 500, more than 25 percent of the Global 2000 and large government agencies. Learn more at tenable.com.
Contact Information
Investor Relations
Andrea DiMarco
investors@tenable.com
Media Relations
Cayla Baker
tenablepr@tenable.com

2



Forward-Looking Statements
This press release includes forward-looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. All statements contained in this press release other than statements of historical fact, including statements regarding our future results of operations and financial position, business strategy and plans and objectives for future operations, are forward-looking statements and represent our views as of the date of this press release. The words “anticipate,” believe,” “continue,” “estimate,” “expect,” “intend,” “may,” “will” and similar expressions are intended to identify forward-looking statements. We have based these forward-looking statements on our current expectations and projections about future events and financial trends that we believe may affect our financial condition, results of operations, business strategy, short-term and long-term business operations and objectives and financial needs. These forward-looking statements are subject to a number of assumptions and risks and uncertainties, many of which involve factors or circumstances that are beyond our control that could affect our financial results. These risks and uncertainties are detailed in the sections titled "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" in our Quarterly Report on Form 10-Q for the quarter ended September 30, 2018 and other filings that we make from time to time with the SEC, which are available on the SEC's website at sec.gov. Moreover, we operate in a very competitive and rapidly changing environment. New risks emerge from time to time. It is not possible for our management to predict all risks, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. In light of these risks, uncertainties and assumptions, the future events and trends discussed in this press release may not occur and actual results could differ materially and adversely from those anticipated or implied in any forward-looking statements. Except as required by law, we are under no obligation to update these forward-looking statements subsequent to the date of this press release, or to update the reasons if actual results differ materially from those anticipated in the forward-looking statements.
Non-GAAP Financial Measures and Other Key Metrics
To supplement our consolidated financial statements, which are prepared and presented in accordance with GAAP, we use certain non-GAAP financial measures, as described below, to understand and evaluate our core operating performance. These non-GAAP financial measures, which may be different than similarly titled measures used by other companies, are presented to enhance investors’ overall understanding of our financial performance and should not be considered a substitute for, or superior to, the financial information prepared and presented in accordance with GAAP.
We believe that these non-GAAP financial measures provide useful information about our financial performance, enhance the overall understanding of our past performance and future prospects and allow for greater transparency with respect to important metrics used by management for financial and operational decision-making. We present these non-GAAP metrics to assist investors in seeing our financial performance using a management view and because we believe that these measures provide an additional tool for investors to use in comparing our core financial performance over multiple periods with other companies in our industry.
Reconciliations of non-GAAP financial measures to the most directly comparable GAAP financial measures are included in the financial tables accompanying this press release.
Calculated Current Billings: We define calculated current billings, a non-GAAP financial measure, as total revenue recognized in a period plus the change in current deferred revenue in the corresponding period. We believe that calculated current billings is a key metric to measure our periodic performance. Given that most of our customers pay in advance (including multi-year contracts), but we generally recognize the related revenue ratably over time, we use calculated current billings to measure and monitor our ability to provide our business with the working capital generated by upfront payments from our customers. We believe that calculated current billings, which excludes deferred revenue for periods beyond twelve months in a customer’s contractual term, more closely correlates with annual contract value and that the variability in total billings, depending on the timing of large multi-year contracts and the preference for annual billing versus multi-year upfront billing, may distort growth in one period over another.
Free Cash Flow: We define free cash flow, a non-GAAP financial measure, as net cash used in operating activities less purchases of property and equipment. We believe free cash flow is an important liquidity measure of the cash (if any) that is available, after purchases of property and equipment, for investment in our business and to make acquisitions. We believe that free cash flow is useful to investors as a liquidity measure because it measures our ability to generate or use cash.

3



Non-GAAP Loss from Operations and Non-GAAP Operating Margin: We define these non-GAAP financial measures as their respective GAAP measures, excluding the effect of stock-based compensation and amortization of intangible assets.
Non-GAAP Net Loss, Non-GAAP Net Loss Per Share and Pro Forma Non-GAAP Net Loss Per Share: We define non-GAAP net loss as GAAP net loss attributable to common stockholders, excluding the effect of the accretion of Series A and B redeemable convertible preferred stock, stock-based compensation and amortization of intangible assets, including the applicable tax impact. We use non-GAAP net loss to calculate non-GAAP net loss per share and pro forma non-GAAP net loss per share. Pro forma non-GAAP net loss per share is calculated by giving effect to the conversion of our redeemable convertible preferred stock into common stock as though the conversion occurred at the beginning of each period presented.
Non-GAAP Gross Profit and Non-GAAP Gross Margin: We define non-GAAP gross profit as GAAP gross profit, excluding the effect of stock-based compensation and amortization of intangible assets. Non-GAAP gross margin is defined as non-GAAP gross profit as a percentage of revenue.
Non-GAAP Sales and Marketing Expense, Non-GAAP Research and Development Expense and Non-GAAP General and Administrative Expense: We define these non-GAAP measures as their respective GAAP measures, excluding stock-based compensation.



4



TENABLE HOLDINGS, INC.
CONSOLIDATED STATEMENTS OF OPERATIONS
(unaudited)
 
Three Months Ended
December 31,
 
Year Ended
December 31,
(in thousands, except per share data)
2018
 
2017
 
2018
 
2017
Revenue
$
75,221

 
$
54,117

 
$
267,360

 
$
187,727

Cost of revenue(1)
12,399

 
8,378

 
43,167

 
25,588

Gross profit
62,822

 
45,739

 
224,193

 
162,139

Operating expenses:
 
 
 
 
 
 
 
Sales and marketing(1)
47,380

 
32,784

 
173,344

 
116,299

Research and development(1)
21,169

 
15,633

 
76,698

 
57,673

General and administrative(1)
13,864

 
8,945

 
46,732

 
28,927

Total operating expenses
82,413

 
57,362

 
296,774

 
202,899

Loss from operations
(19,591
)
 
(11,623
)
 
(72,581
)
 
(40,760
)
Other income (expense), net
1,184

 
(26
)
 
1,424

 
(91
)
Loss before income taxes
(18,407
)
 
(11,649
)
 
(71,157
)
 
(40,851
)
Provision for income taxes
1,207

 
20

 
2,364

 
171

Net loss and comprehensive loss
(19,614
)
 
(11,669
)
 
(73,521
)
 
(41,022
)
Accretion of Series A and B redeemable convertible preferred stock

 
(193
)
 
(434
)
 
(763
)
Net loss attributable to common stockholders
$
(19,614
)
 
$
(11,862
)
 
$
(73,955
)
 
$
(41,785
)
 
 
 
 
 
 
 
 
Net loss per share attributable to common stockholders, basic and diluted
$
(0.21
)
 
$
(0.52
)
 
$
(1.38
)
 
$
(1.88
)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted
92,187

 
22,827

 
53,669

 
22,211

_______________
(1)    Includes stock-based compensation as follows:
 
Three Months Ended
December 31,
 
Year Ended
December 31,
 
2018
 
2017
 
2018
 
2017
Cost of revenue
$
824

 
$
114

 
$
1,707

 
$
281

Sales and marketing
2,927

 
542

 
6,911

 
1,579

Research and development
2,210

 
426

 
5,804

 
1,782

General and administrative
2,708

 
1,175

 
8,453

 
4,118

Total stock-based compensation
$
8,669

 
$
2,257

 
$
22,875

 
$
7,760


5



TENABLE HOLDINGS, INC.
CONSOLIDATED BALANCE SHEETS
(unaudited)
 
December 31,
(in thousands, except per share data)
2018
 
2017
Assets
 
 
 
Current assets:
 
 
 
Cash and cash equivalents
$
165,116

 
$
27,210

Short-term investments
118,119

 

Accounts receivable (net of allowance for doubtful accounts of $188 and $160 at December 31, 2018 and 2017, respectively)
68,261

 
50,881

Deferred commissions
23,272

 
17,170

Prepaid expenses and other current assets
22,020

 
15,994

Total current assets
396,788

 
111,255

Property and equipment, net
11,348

 
10,754

Construction in progress

 
2,252

Deferred commissions (net of current portion)
36,162

 
33,006

Operating lease right-of-use assets
8,504

 

Other assets
7,810

 
7,070

Total assets
$
460,612

 
$
164,337

 
 
 
 
Liabilities, Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit)
 
 
 
Current liabilities:
 
 
 
Accounts payable
$
171

 
$
338

Accrued expenses
5,554

 
4,878

Accrued compensation
29,594

 
18,482

Deferred revenue
213,644

 
154,898

Operating lease liabilities
4,262

 

Other current liabilities
1,079

 
1,750

Total current liabilities
254,304

 
180,346

Deferred revenue (net of current portion)
76,259

 
70,920

Operating lease liabilities (net of current portion)
6,055

 

Financing obligation

 
1,802

Other liabilities
2,231

 
5,199

Total liabilities
338,849

 
258,267

 
 
 
 
Redeemable convertible Series A preferred stock (par value: $0.01; no shares and 15,848 shares authorized, issued and outstanding at December 31, 2018 and 2017, respectively, with liquidation preference of $50,000 at December 31, 2017)

 
49,935

Redeemable convertible Series B preferred stock (par value: $0.01; no shares and 42,000 shares authorized, 39,538 issued and outstanding at December 31, 2018 and 2017, respectively, with liquidation preference of $230,008 at December 31, 2017)

 
227,800

Stockholders’ equity (deficit):
 
 
 
Common stock (par value: $0.01; 500,000 and 93,855 shares authorized, 93,126 and 24,472 shares issued and outstanding at December 31, 2018 and 2017, respectively)
931

 
246

Additional paid-in capital
586,940

 
20,676

Accumulated deficit
(466,108
)
 
(392,587
)
Total stockholders’ equity (deficit)
121,763

 
(371,665
)
Total liabilities, redeemable convertible preferred stock and stockholders’ equity (deficit)
$
460,612

 
$
164,337


6



TENABLE HOLDINGS, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(unaudited)
 
Year Ended December 31,
(in thousands)
2018
 
2017
Cash flows from operating activities:
 
 
 
Net loss
$
(73,521
)
 
$
(41,022
)
Adjustments to reconcile net loss to net cash used in operating activities:
 
 
 
Depreciation and amortization
6,192

 
4,692

Stock-based compensation
22,875

 
7,760

Other
533

 
(748
)
Changes in operating assets and liabilities:
 
 
 
Accounts receivable
(17,408
)
 
(14,769
)
Prepaid expenses and other current assets
(6,105
)
 
(8,345
)
Deferred commissions
(9,258
)
 
(20,058
)
Other assets
(1,876
)
 
(3,267
)
Accounts payable and accrued expenses
294

 
1,922

Accrued compensation
11,112

 
4,298

Deferred revenue
64,085

 
63,404

Other current liabilities
408

 
421

Other liabilities
110

 
(554
)
Net cash used in operating activities
(2,559
)
 
(6,266
)
 
 
 
 
Cash flows from investing activities:
 
 
 
Purchases of property and equipment
(5,733
)
 
(2,755
)
Purchases of short-term investments
(117,488
)
 

Net cash used in investing activities
(123,221
)
 
(2,755
)
 
 
 
 
Cash flows from financing activities:
 
 
 
Proceeds from initial public offering, net of underwriting discounts and commissions
268,531

 

Payments of costs related to initial public offering
(3,932
)
 

Principal payments under financing lease obligations
(1,443
)
 
(306
)
Credit facility issuance costs

 
(238
)
Proceeds from the exercise of stock options
1,668

 
3,020

Repurchases of common stock
(75
)
 
(385
)
Net cash provided by financing activities
264,749

 
2,091

Effect of exchange rate changes on cash and cash equivalents and restricted cash
(1,063
)
 
(68
)
Net increase (decrease) in cash and cash equivalents and restricted cash
137,906

 
(6,998
)
Cash and cash equivalents and restricted cash at beginning of year
27,472

 
34,470

Cash and cash equivalents and restricted cash at end of year
$
165,378

 
$
27,472



7



TENABLE HOLDINGS, INC.
REVENUE COMPONENTS AND RECONCILIATION OF GAAP TO NON-GAAP FINANCIAL MEASURES
(unaudited)
Revenue
Three Months Ended
December 31,
 
Year Ended
December 31,
(in thousands)
2018
 
2017
 
2018
 
2017
Subscription revenue
$
59,259

 
$
39,395

 
$
205,827

 
$
132,873

Perpetual license and maintenance revenue
13,869

 
13,208

 
54,622

 
50,337

Professional services and other revenue
2,093

 
1,514

 
6,911

 
4,517

Revenue(1)
$
75,221

 
$
54,117

 
$
267,360

 
$
187,727

_______________
(1)    Recurring revenue, which includes revenue from subscription arrangements for software and cloud-based solutions and maintenance associated with perpetual licenses represented 90%, 87%, 89% and 86% of revenue for the three months ended December 31, 2018 and 2017 and the year ended December 31, 2018 and 2017, respectively.
Calculated Current Billings
Three Months Ended
December 31,
 
Year Ended
December 31,
(in thousands)
2018
 
2017
 
2018
 
2017
Revenue
$
75,221

 
$
54,117

 
$
267,360

 
$
187,727

Deferred revenue (current), end of period
213,644

 
154,898

 
213,644

 
154,898

Deferred revenue (current), beginning of period(1)
(191,578
)
 
(137,521
)
 
(154,898
)
 
(107,006
)
Calculated current billings
$
97,287

 
$
71,494

 
$
326,106

 
$
235,619

________________
(1)    In connection with adopting ASC 606, we recorded $19.0 million of current deferred revenue on January 1, 2017 related to perpetual license revenue recognized in prior periods.
Free Cash Flow
Three Months Ended
December 31,
 
Year Ended
December 31,
(in thousands)
2018
 
2017
 
2018
 
2017
Net cash used in operating activities
$
(1,554
)
 
$
(5,452
)
 
$
(2,559
)
 
$
(6,266
)
Purchases of property and equipment
(1,593
)
 
(1,127
)
 
(5,733
)
 
(2,755
)
Free cash flow(1)
$
(3,147
)
 
$
(6,579
)
 
$
(8,292
)
 
$
(9,021
)
________________
(1)    Contributions to our employee stock purchase plan during the three months and year ended December 31, 2018 contributed $4.0 million and $6.3 million, respectively, to free cash flow.
Non-GAAP Loss from Operations and Non-GAAP Operating Margin
Three Months Ended
December 31,
 
Year Ended
December 31,
(dollars in thousands)
2018
 
2017
 
2018
 
2017
Loss from operations
$
(19,591
)
 
$
(11,623
)
 
$
(72,581
)
 
$
(40,760
)
Stock-based compensation
8,669

 
2,257

 
22,875

 
7,760

Amortization of intangible assets
150

 
150

 
603

 
603

Non-GAAP loss from operations
$
(10,772
)
 
$
(9,216
)
 
$
(49,103
)
 
$
(32,397
)
Operating margin
(26
)%
 
(21
)%
 
(27
)%
 
(22
)%
Non-GAAP operating margin
(14
)%
 
(17
)%
 
(18
)%
 
(17
)%

8



Non-GAAP Net Loss, Non-GAAP Net Loss Per Share and Pro forma Non-GAAP Net Loss Per Share
Three Months Ended
December 31,
 
Year Ended
December 31,
(in thousands, except per share data)
2018
 
2017
 
2018
 
2017
Net loss attributable to common stockholders
$
(19,614
)
 
$
(11,862
)
 
$
(73,955
)
 
$
(41,785
)
Accretion of Series A and B redeemable convertible preferred stock

 
193

 
434

 
763

Stock-based compensation
8,669

 
2,257

 
22,875

 
7,760

Tax impact of stock-based compensation(1)
(80
)
 
(19
)
 
(218
)
 
(54
)
Amortization of intangible assets(1)
150

 
150

 
603

 
603

Non-GAAP net loss
$
(10,875
)
 
$
(9,281
)
 
$
(50,261
)
 
$
(32,713
)
 
 
 
 
 
 
 
 
Net loss per share attributable to common stockholders, basic and diluted
$
(0.21
)
 
$
(0.52
)
 
$
(1.38
)
 
$
(1.88
)
Accretion of Series A and B redeemable convertible preferred stock

 
0.01

 
0.01

 
0.03

Stock-based compensation
0.09

 
0.10

 
0.42

 
0.35

Tax impact of stock-based compensation(1)

 

 

 

Amortization of intangible assets(1)

 

 
0.01

 
0.03

Non-GAAP net loss per share, basic and diluted
$
(0.12
)
 
$
(0.41
)
 
$
(0.94
)
 
$
(1.47
)
 
 
 
 
 
 
 
 
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted
92,187
 
22,827
 
53,669
 
22,211
Pro forma adjustment to reflect the assumed conversion of our convertible redeemable preferred stock as of the beginning of the period

 
55,386
 
31,107
 
55,386
Weighted-average shares used to compute pro forma non-GAAP net loss per share, basic and diluted
92,187
 
78,213
 
84,776
 
77,597
 
 
 
 
 
 
 
 
Pro forma non-GAAP net loss per share, basic and diluted
$
(0.12
)
 
$
(0.12
)
 
$
(0.59
)
 
$
(0.42
)
________________
(1)    The tax impact of stock-based compensation is based on the tax treatment for the applicable tax jurisdictions. There was no tax impact related to the amortization of intangible assets as it was incurred in the United States in periods in which we maintained a full valuation allowance.
Non-GAAP Gross Profit and Non-GAAP Gross Margin
Three Months Ended
December 31,
 
Year Ended
December 31,
(dollars in thousands)
2018
 
2017
 
2018
 
2017
Gross profit
$
62,822

 
$
45,739

 
$
224,193

 
$
162,139

Stock-based compensation
824

 
114

 
1,707

 
281

Amortization of intangible assets
150

 
150

 
603

 
603

Non-GAAP gross profit
$
63,796

 
$
46,003

 
$
226,503

 
$
163,023

Gross margin
84
%
 
85
%
 
84
%
 
86
%
Non-GAAP gross margin
85
%
 
85
%
 
85
%
 
87
%
Non-GAAP Sales and Marketing Expense
Three Months Ended
December 31,
 
Year Ended
December 31,
(dollars in thousands)
2018
 
2017
 
2018
 
2017
Sales and marketing expense
$
47,380

 
$
32,784

 
$
173,344

 
$
116,299

Less: Stock-based compensation
2,927

 
542

 
6,911

 
1,579

Non-GAAP sales and marketing expense
$
44,453

 
$
32,242

 
$
166,433

 
$
114,720

Non-GAAP sales and marketing expense % of revenue
59
%
 
60
%
 
62
%
 
61
%

9



Non-GAAP Research and Development Expense
Three Months Ended
December 31,
 
Year Ended
December 31,
(dollars in thousands)
2018
 
2017
 
2018
 
2017
Research and development expense
$
21,169

 
$
15,633

 
$
76,698

 
$
57,673

Less: Stock-based compensation
2,210

 
426

 
5,804

 
1,782

Non-GAAP research and development expense
$
18,959

 
$
15,207

 
$
70,894

 
$
55,891

Non-GAAP research and development expense % of revenue
25
%
 
28
%
 
27
%
 
30
%
Non-GAAP General and Administrative Expense
Three Months Ended
December 31,
 
Year Ended
December 31,
(dollars in thousands)
2018
 
2017
 
2018
 
2017
General and administrative expense
$
13,864

 
$
8,945

 
$
46,732

 
$
28,927

Less: Stock-based compensation
2,708

 
1,175

 
8,453

 
4,118

Non-GAAP general and administrative expense
$
11,156

 
$
7,770

 
$
38,279

 
$
24,809

Non-GAAP general and administrative expense % of revenue
15
%
 
14
%
 
14
%
 
13
%
Forecasted Non-GAAP Loss from Operations
Three Months Ended
March 31, 2019
 
Year Ended
December 31, 2019
(in millions)
Low
 
High
 
Low
 
High
Forecasted loss from operations
$
(27.2
)
 
$
(26.2
)
 
$
(108.4
)
 
$
(103.4
)
Forecasted stock-based compensation
10.0

 
10.0

 
48.0

 
48.0

Forecasted amortization of intangible assets
0.2

 
0.2

 
0.4

 
0.4

Forecasted non-GAAP loss from operations
$
(17.0
)
 
$
(16.0
)
 
$
(60.0
)
 
$
(55.0
)
Forecasted Non-GAAP Net Loss and Non-GAAP Net Loss Per Share
Three Months Ended
March 31, 2019
 
Year Ended
December 31, 2019
(in millions, except per share data)
Low
 
High
 
Low
 
High
Forecasted net loss
$
(28.2
)
 
$
(27.2
)
 
$
(107.4
)
 
$
(102.4
)
Forecasted stock-based compensation(1)
10.0

 
10.0

 
48.0

 
48.0

Forecasted amortization of intangible assets
0.2

 
0.2

 
0.4

 
0.4

Forecasted non-GAAP net loss
$
(18.0
)
 
$
(17.0
)

$
(59.0
)

$
(54.0
)
 
 
 
 
 
 
 
 
Forecasted net loss per share, basic and diluted
$
(0.30
)
 
$
(0.29
)
 
$
(1.13
)
 
$
(1.08
)
Forecasted stock-based compensation(1)
0.11

 
0.11

 
0.51

 
0.51

Forecasted amortization of intangible assets

 

 

 

Forecasted Non-GAAP net loss per share, basic and diluted
$
(0.19
)
 
$
(0.18
)
 
$
(0.62
)
 
$
(0.57
)
 
 
 
 
 
 
 
 
Forecasted weighted-average shares used to compute net loss per share, basic and diluted
93.2
 
93.2
 
95.1
 
95.1
________________
(1)    The tax impact of stock-based compensation is immaterial for purposes of this reconciliation.

10