10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended June 30, 2016

or

q TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Transition Period from _____________ to _____________

Commission File Number:  000-30111

Lexicon Pharmaceuticals, Inc.

(Exact Name of Registrant as Specified in its Charter)

Delaware	76-0474169
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification Number)

8800 Technology Forest Place

The Woodlands, Texas 77381

(Address of Principal Executive Offices and Zip Code)

(281) 863-3000

(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days.

Yes þ No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes þ No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.  See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer    Accelerated filer þ Non-accelerated filer    Smaller reporting company

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes No þ

As of August 1, 2016, 103,865,713 shares of the registrant’s common stock, par value $0.001 per share, were outstanding.

Lexicon Pharmaceuticals, Inc.

Table of Contents

		Page
Factors Affecting Forward-Looking Statements		2
Part I – Financial Information		3
Item 1.	Financial Statements	3
	Consolidated Balance Sheets – June 30, 2016 (unaudited) and December 31, 2015	3
	Consolidated Statements of Comprehensive Loss (unaudited) – Three and Six Months Ended June 30, 2016 and 2015	4
	Consolidated Statements of Stockholders’ Equity (unaudited) – Six Months Ended June 30, 2016 and 2015	5
	Consolidated Statements of Cash Flows (unaudited) – Six Months Ended June 30, 2016 and 2015	6
	Notes to Consolidated Financial Statements (unaudited)	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	16
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	22
Item 4.	Controls and Procedures	22
Part II – Other Information		23
Item 1.	Legal Proceedings	23
Item 1A.	Risk Factors	23
Item 6.	Exhibits	25
Signatures		26

The Lexicon name and logo are registered trademarks of Lexicon Pharmaceuticals, Inc.

——————

Factors Affecting Forward Looking Statements

This quarterly report on Form 10-Q contains forward-looking statements. These statements relate to future events or our future financial performance. We have attempted to identify forward-looking statements by terminology including “anticipate,” “believe,” “can,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “predict,” “should” or “will” or the negative of these terms or other comparable terminology. These statements are only predictions and involve known and unknown risks, uncertainties and other factors, including the risks outlined under “Part II, Item 1A. - Risk Factors,” that may cause our or our industry’s actual results, levels of activity, performance or achievements to be materially different from any future results, levels or activity, performance or achievements expressed or implied by these forward-looking statements.

Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, levels of activity, performance or achievements. We are not under any duty to update any of the forward-looking statements after the date of this quarterly report on Form 10-Q to conform these statements to actual results, unless required by law.

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Part I – Financial Information

Item 1.                 Financial Statements

Lexicon Pharmaceuticals, Inc.

Consolidated Balance Sheets

(In thousands, except par value)

	As of June 30,			As of December 31,
	2016			2015
Assets	(unaudited)
Current assets:
Cash and cash equivalents	$	38,410		$	202,989
Short-term investments	390,955			318,363
Accounts receivable, net of allowances of $4	1,018			911
Prepaid expenses and other current assets	9,071			10,137
Total current assets	439,454			532,400
Property and equipment, net of accumulated depreciation and amortization of $58,855 and $59,428, respectively	20,350			21,227
Goodwill	44,543			44,543
Other intangible assets	53,357			53,357
Other assets	430			433
Total assets	$	558,134		$	651,960
Liabilities and Equity
Current liabilities:
Accounts payable	$	28,225		$	19,725
Accrued liabilities	23,950			24,757
Current portion of deferred revenue	61,528			76,499
Current portion of long-term debt, net of deferred issuance costs	17,289			1,976
Total current liabilities	130,992			122,957
Deferred revenue, net of current portion	92,188			109,151
Long-term debt, net of deferred issuance costs	84,909			100,960
Deferred tax liabilities	18,675			18,675
Other long-term liabilities	14,037			14,367
Total liabilities	340,801			366,110
Commitments and contingencies
Equity:
Preferred stock, $.01 par value; 5,000 shares authorized; no shares issued and outstanding	—			—
Common stock, $.001 par value; 225,000 shares authorized; 104,152 and 103,860 shares issued, respectively	104			104
Additional paid-in capital	1,402,190			1,397,646
Accumulated deficit	(1,181,929		)	(1,108,934		)
Accumulated other comprehensive gain (loss)	336			(219		)
Treasury stock, at cost, 306 and 237 shares, respectively	(3,368		)	(2,747		)
Total equity	217,333			285,850
Total liabilities and equity	$	558,134		$	651,960

The accompanying notes are an integral part of these consolidated financial statements.

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Lexicon Pharmaceuticals, Inc.

Consolidated Statements of Comprehensive Loss

(In thousands, except per share amounts)

(Unaudited)

	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
Revenues:
Collaborative agreements	$	20,001		$	338		$	32,495		$	2,130
Subscription and license fees	88			38			88			38
Total revenues	20,089			376			$	32,583		$	2,168
Operating expenses:
Research and development, including stock-based compensation of $973, $868, $1,962 and $1,972, respectively	48,216			20,769			85,218			41,634
Increase (decrease) in fair value of Symphony Icon, Inc. purchase liability	478			(12		)	1,443			1,741
General and administrative, including stock-based compensation of $984, $920, $1,830 and $1,769, respectively	8,416			6,307			16,814			12,008
Total operating expenses	57,110			27,064			103,475			55,383
Loss from operations	(37,021		)	(26,688		)	(70,892		)	(53,215		)
Interest expense	(1,638		)	(1,655		)	(3,287		)	(3,357		)
Interest and other income, net	547			269			1,184			422
Net loss	$	(38,112	)	$	(28,074	)	$	(72,995	)	$	(56,150	)
Net loss per common share, basic and diluted	$	(0.37	)	$	(0.27	)	$	(0.70	)	$	(0.54	)
Shares used in computing consolidated net loss per common share, basic and diluted	103,830			103,608			103,756			103,562
Other comprehensive loss:
Unrealized gain on investments	39			75			555			161
Comprehensive loss	$	(38,073	)	$	(27,999	)	$	(72,440	)	$	(55,989	)

The accompanying notes are an integral part of these consolidated financial statements.

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Lexicon Pharmaceuticals, Inc.

Consolidated Statements of Stockholders’ Equity

(In thousands)

(Unaudited)

	Common Stock			Additional					Accumulated Other
	Shares	Par Value		Paid-In Capital		Accumulated Deficit			Comprehensive Gain (Loss)			Treasury Stock			Total
Balance at December 31, 2014	103,663	$	104	$	1,390,619	$	(1,104,252	)	$	(63	)	$	(2,390	)	$	284,018
Stock-based compensation	—	—		3,741		—			—			—			3,741
Issuance of common stock under Equity Incentive Plans	188	—		—		—			—			—			—
Repurchase of common stock	—	—		—		—			—			(357		)	(357		)
Net loss	—	—		—		(56,150		)	—			—			(56,150		)
Unrealized gain on investments	—	—		—		—			161			—			161
Other	—	—		61		—			—			—			61
Balance at June 30, 2015	103,851	$	104	$	1,394,421	$	(1,160,402	)	$	98		$	(2,747	)	$	231,474
Balance at December 31, 2015	103,860	$	104	$	1,397,646	$	(1,108,934	)	$	(219	)	$	(2,747	)	$	285,850
Stock-based compensation	—	—		3,792		—			—			—			3,792
Issuance of common stock under Equity Incentive Plans	292	—		752		—			—			—			752
Repurchase of common stock	—	—		—		—			—			(621		)	(621		)
Net loss	—	—		—		(72,995		)	—			—			(72,995		)
Unrealized gain on investments	—	—		—		—			555			—			555
Balance at June 30, 2016	104,152	$	104	$	1,402,190	$	(1,181,929	)	$	336		$	(3,368	)	$	217,333

The accompanying notes are an integral part of these consolidated financial statements.

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Lexicon Pharmaceuticals, Inc.

Consolidated Statements of Cash Flows

(In thousands)

(Unaudited)

	Six Months Ended June 30,
	2016			2015
Cash flows from operating activities:
Net loss	$	(72,995	)	$	(56,150	)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation and amortization	1,037			601
Increase in fair value of Symphony Icon, Inc. purchase liability	1,443			1,741
Stock-based compensation	3,792			3,741
Amortization of debt issuance costs	250			241
(Gain) loss on disposal of property and equipment	12			(59		)
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(107		)	719
(Increase) decrease in prepaid expenses and other current assets	1,066			(2,387		)
Increase in other assets	—			(413		)
Increase (decrease) in accounts payable and other liabilities	5,818			(3,326		)
Decrease in deferred revenue	(31,934		)	(371		)
Net cash used in operating activities	(91,618		)	(55,663		)
Cash flows from investing activities:
Purchases of property and equipment	(67		)	(480		)
Proceeds from disposal of property and equipment	—			334
Purchases of investments	(219,437		)	(70,505		)
Maturities of investments	147,400			—
Net cash used in investing activities	(72,104		)	(70,651		)
Cash flows from financing activities:
Proceeds from issuance of common stock	752			—
Repurchase of common stock	(621		)	(357		)
Repayment of debt borrowings	(988		)	(912		)
Other financing activities	—			61
Net cash used in financing activities	(857		)	(1,208		)
Net decrease in cash and cash equivalents	(164,579		)	(127,522		)
Cash and cash equivalents at beginning of period	202,989			137,266
Cash and cash equivalents at end of period	$	38,410		$	9,744
Supplemental disclosure of cash flow information:
Cash paid for interest	$	3,046		$	3,184
Supplemental disclosure of non-cash investing and financing activities:
Unrealized gain on investments	$	555		$	161

The accompanying notes are an integral part of these consolidated financial statements.

6

Lexicon Pharmaceuticals, Inc.

Notes to Consolidated Financial Statements

(Unaudited)

1. Basis of Presentation

The accompanying unaudited consolidated financial statements of Lexicon Pharmaceuticals, Inc. (“Lexicon” or the “Company”) have been prepared in accordance with generally accepted accounting principles for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. Operating results for the six-month period ended June 30, 2016 are not necessarily indicative of the results that may be expected for the year ended December 31, 2016.

The accompanying consolidated financial statements include the accounts of Lexicon and its wholly-owned subsidiaries. Intercompany transactions and balances are eliminated in consolidation.

For further information, refer to the financial statements and footnotes thereto included in Lexicon’s annual report on Form 10-K for the year ended December 31, 2015, as filed with the SEC.

2. Net Loss Per Share

Net loss per share is computed using the weighted average number of shares of common stock outstanding during the applicable period and excludes shares underlying convertible debt, stock options and restricted stock units because they are antidilutive.  There are no differences between basic and diluted net loss per share for all periods presented.

3. Stock-Based Compensation

The Company recorded $2.0 million and $1.8 million of stock-based compensation expense for the three months ended June 30, 2016 and 2015, respectively. The Company recorded $3.8 million and $3.7 million of stock-based compensation expense for the six months ended June 30, 2016 and 2015, respectively.  The Company utilized the Black-Scholes valuation model for estimating the fair value of the stock compensation granted, with the following weighted-average assumptions for options granted in the six months ended June 30, 2016 and 2015:

	Expected Volatility		Risk-free Interest Rate		Expected Term	Dividend Rate
June 30, 2016:
Employees	63	%	1.1	%	4	—	%
Officers and non-employee directors	83	%	1.6	%	8	—	%
June 30, 2015:
Employees	63	%	1.2	%	4	—	%
Officers and non-employee directors	81	%	1.8	%	8	—	%

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The following is a summary of option activity under Lexicon’s stock-based compensation plans for the six months ended June 30, 2016:

	Options		Weighted Average Exercise Price
	(in thousands)
Outstanding at December 31, 2015	4,217		$	12.35
Granted	1,130		9.23
Exercised	(66	)	9.98
Expired	(166	)	27.36
Forfeited	(12	)	8.65
Outstanding at June 30, 2016	5,103		11.21
Exercisable at June 30, 2016	2,911		$	12.94

During the six months ended June 30, 2016, Lexicon also granted its employees annual restricted stock units. These restricted stock units vest in four annual installments. The following is a summary of restricted stock units activity under Lexicon’s stock-based compensation plans for the six months ended June 30, 2016:

	Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Outstanding at December 31, 2015	637		$	8.74
Granted	496		8.20
Vested	(206	)	9.75
Forfeited	(33	)	10.95
Nonvested at June 30, 2016	894		$	8.12

During the six months ended June 30, 2016, Lexicon granted its non-employee directors 11,456 shares of restricted stock awards. The restricted stock awards had a weighted average grant date fair value of $13.96 per share and vested immediately.

4. Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers”, which amends FASB ASC Topic 606. ASU 2014-09 provides a single, comprehensive revenue recognition model for all contracts with customers. This standard contains principles for the determination of the measurement of revenue and the timing of when such revenue is recognized. Revenue recognition will reflect the transfer of goods or services to customers at an amount that is expected to be earned in exchange for those goods or services. ASU 2014-09 was scheduled to be effective for annual reporting periods beginning after December 15, 2016, and early adoption was not permitted. In August 2015, the FASB issued ASU No. 2015-14, “Revenue from Contracts with Customers: Deferral of Effective Date”, which defers the effective date of ASU 2014-09 by one year. ASU 2014-19 is now effective for annual periods after December 15, 2017 including interim periods within that reporting period. Early application is permitted only for annual periods beginning after December 15, 2016, including interim periods within that reporting period. Management is currently evaluating the impact of these pronouncements on Lexicon’s consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, “Simplifying the Presentation of Debt Issuance Costs.” ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. During the six months ended June 30, 2016, the Company adopted ASU No. 2015-03 retrospectively for all periods presented in the accompanying consolidated balance sheets. The reclassification of debt issuance costs resulted in reductions in other assets, current portion of long-term debt and long-term debt of $2.9 million, $39,000 and $2.8 million, respectively, as of December 31, 2015.

In November 2015, the FASB issued ASU No. 2015-17, “Income Taxes.” ASU 2015-17 simplifies the presentation of deferred income taxes, requiring that deferred tax assets and liabilities be classified as noncurrent in a classified balance sheet. The pronouncement is effective for fiscal years, and interim periods within those years, beginning after December 31, 2016, and early adoption is permitted. Management does not expect the adoption of this pronouncement to have a material impact on Lexicon’s consolidated financial statements.

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In January 2016, the FASB issued ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2016-01 requires that most equity investments be measured at fair value, with subsequent changes in fair value recognized in net income. The pronouncement also impacts financial liabilities under the fair value option and the presentation and disclosure requirements for financial instruments. This pronouncement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017, and early adoption is not permitted. Management does not expect the adoption of this pronouncement to have a material impact on Lexicon’s consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, “Leases.” ASU 2016-02 requires companies that lease assets to recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in its balance sheet. The pronouncement will also require additional disclosures about the amount, timing and uncertainty of cash flows arising from leases. This pronouncement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. Management is currently evaluating the impact of this pronouncement on Lexicon’s consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09, “Stock Compensation,” which is intended to simplify several aspects of the accounting for share-based payment award transactions. This pronouncement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016, and early adoption is permitted. Management is currently evaluating the impact of this pronouncement on Lexicon’s consolidated financial statements.

5. Cash and Cash Equivalents and Investments

The fair value of cash and cash equivalents and investments held at June 30, 2016 and December 31, 2015 are as follows:

	As of June 30, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(in thousands)
Cash and cash equivalents	$	38,410	$	—	$	—		$	38,410
Securities maturing within one year:
U.S. treasury securities	379,307		333		—			379,640
Corporate debt securities	11,312		6		(3		)	11,315
Total short-term investments	$	390,619	$	339	$	(3	)	$	390,955
Total cash and cash equivalents and investments	$	429,029	$	339	$	(3	)	$	429,365
	As of December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
			(in thousands)
Cash and cash equivalents	$	202,989	$	—	$	—		$	202,989
Securities maturing within one year:
U.S. treasury securities	313,105		2		(219		)	312,888
Corporate debt securities	5,477		—		(2		)	5,475
Total short-term investments	$	318,582	$	2	$	(221	)	$	318,363
Total cash and cash equivalents and investments	$	521,571	$	2	$	(221	)	$	521,352

There were no realized gains or losses for the six months ended June 30, 2016, and no realized gains or losses for the six months ended June 30, 2015. The cost of securities sold is based on the specific identification method.

6. Fair Value Measurements

The Company uses various inputs in determining the fair value of its investments and measures these assets on a recurring basis. Assets and liabilities recorded at fair value in the consolidated balance sheets are categorized by the level of objectivity associated with the inputs used to measure their fair value. The following levels are directly related to the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities:

• Level 1 - quoted prices in active markets for identical investments, which include U.S. treasury securities

9

• Level 2 - other significant observable inputs (including quoted prices for similar investments, market corroborated inputs, etc.), which includes corporate debt securities

• Level 3 - significant unobservable inputs (including the Company’s own assumptions in determining the fair value of the Symphony Icon purchase consideration liability)

The inputs or methodology used for valuing securities are not necessarily an indication of the credit risk associated with investing in those securities. The following table provides the fair value measurements of applicable Company assets and liabilities that are measured at fair value on a recurring basis according to the fair value levels described above as of June 30, 2016 and December 31, 2015.

	Assets and Liabilities at Fair Value as of June 30, 2016
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	38,410	$	—	$	—	$	38,410
Short-term investments	379,640		11,315		—		390,955
Total cash and cash equivalents and investments	$	418,050	$	11,315	$	—	$	429,365
Liabilities
Accrued liabilities	$	—	$	—	$	13,396	$	13,396
Other long-term liabilities	—		—		10,862		10,862
Total liabilities	$	—	$	—	$	24,258	$	24,258

	Assets and Liabilities at Fair Value as of December 31, 2015
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	200,526	$	2,463	$	—	$	202,989
Short-term investments	312,888		5,475		—		318,363
Total cash and cash equivalents and investments	$	513,414	$	7,938	$	—	$	521,352
Liabilities
Accrued liabilities	$	—	$	—	$	12,453	$	12,453
Other long-term liabilities	—		—		10,362		10,362
Total liabilities	$	—	$	—	$	22,815	$	22,815

The Company’s Level 3 liabilities, which consist of the Symphony Icon purchase consideration liability, is estimated using a probability-based income approach utilizing an appropriate discount rate. Subsequent changes in the fair value of the Symphony Icon purchase consideration liability are recorded as an increase or decrease in Symphony Icon purchase liability expense in the accompanying consolidated statements of comprehensive loss. The following table summarizes the change in consolidated balance sheet carrying value associated with Level 3 liabilities for the six months ended June 30, 2016 and 2015 (in thousands).

Balance at December 31, 2015	$	22,815
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	1,443
Balance at June 30, 2016	$	24,258
Balance at December 31, 2014	$	17,638
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	1,741
Payment of contingent payment obligation with cash	(750		)
Balance at June 30, 2015	$	18,629

The Company also has assets that under certain conditions are subject to measurement at fair value on a non-recurring basis. These assets include goodwill associated with the acquisitions of Coelacanth Corporation in 2001 and Symphony Icon in

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2010 and intangible assets associated with the acquisition of Symphony Icon in 2010. For these assets, measurement at fair value in periods subsequent to their initial recognition is applicable if one or more is determined to be impaired.

7.     Buildings and Land Held and Used

In 2014, Lexicon reclassified its buildings and land in The Woodlands, Texas to assets held for sale on its consolidated balance sheet, as it intended to sell these assets. In 2015, Lexicon began negotiations with a commercial developer (the “Purchaser”) to enter into a sales agreement, which would include a leaseback component, requiring a change to Lexicon’s original plan of sale. This resulted in reclassification of its buildings and land to assets held and used in accordance with the accounting guidance regarding selling assets with a leaseback requirement.

In January 2016, Lexicon entered into a Real Estate Purchase and Sale Agreement (“Real Estate Agreement”) with the Purchaser. Under the Real Estate Agreement, Lexicon agreed to sell these assets to the Purchaser for a purchase price of $21.2 million, subject to the negotiation and execution by the parties of a leaseback agreement with respect to a portion of the property. In March 2016, the Purchaser terminated the Real Estate Agreement due to uncertainty in real estate and financing market conditions. Lexicon intends to explore other strategic alternatives with respect to its strategy to reduce facilities costs, including the potential sale of the facilities to an alternative third party. Due to the likelihood that any sale will require a leaseback of a portion of the property, the buildings and land remain classified as assets held and used as of June 30, 2016.

When events or changes in circumstances indicate the carrying amount of property and equity and intangible or other long-lived assets related to specifically acquired assets may not be recoverable, an evaluation of the recoverability of currently recorded costs is performed. When an evaluation is performed, the estimated value of undiscounted future net cash flows associated with the asset is compared to the assets carrying value to determine whether a write-down to fair value is required. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. The Company did not recognize any impairment of long-lived assets in the six months ended June 30, 2016 and 2015.

8. Debt Obligations

Convertible Debt. In November 2014, Lexicon completed an offering of $87.5 million in aggregate principal amount of its 5.25% Convertible Senior Notes due 2021 (the “Notes”). The conversion feature did not meet the criteria for bifurcation as required by generally accepted accounting principles and the entire principal amount was recorded as long-term debt on the Company’s consolidated balance sheet.

The Notes are governed by an indenture (the “Indenture”), dated as of November 26, 2014, between the Company and Wells Fargo Bank, N.A., as trustee. The Notes bear interest at a rate of 5.25% per year, payable semiannually in arrears on June 1 and December 1 of each year, beginning on June 1, 2015. The Notes mature on December 1, 2021. The Company may not redeem the Notes prior to the maturity date, and no sinking fund is provided for the Notes.

Holders of the Notes may convert their Notes at their option at any time prior to the close of business on the business day immediately preceding the maturity date. Upon conversion, the Company will deliver for each $1,000 principal amount of converted Notes a number of shares of its common stock equal to the conversion rate, as described in the Indenture. The conversion rate is initially 118.4553 shares of common stock per $1,000 principal amount of Notes (equivalent to an initial conversion price of $8.442 per share of common stock). The conversion rate is subject to adjustment in some events but will not be adjusted for any accrued and unpaid interest. In addition, following certain corporate events that occur prior to the maturity date, the Company will increase the conversion rate for a holder who elects to convert its Notes in connection with such a corporate event in certain circumstances.

If the Company undergoes a fundamental change, holders may require the Company to repurchase for cash all or any portion of their Notes at a fundamental change repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

In connection with the issuance of the Notes, the Company incurred $3.4 million of debt issuance costs, which offsets long-term debt on the consolidated balance sheets. The debt issuance costs are amortized as interest expense over the expected life of the Notes using the effective interest method. The Company determined the expected life of the debt was equal to the seven-year term of the Notes. As of June 30, 2016, the balance of unamortized debt issuance costs was $2.6 million.

The fair value of the Notes was $159.8 million as of June 30, 2016 and was determined using Level 2 inputs based on the indicative pricing published by certain investment banks or trading levels of the Notes, which are not listed on any securities exchange or quoted on an inter-dealer automated quotation system.

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Mortgage Loan.  In April 2004, Lexicon obtained a $34.0 million mortgage on its facilities in The Woodlands, Texas.  The mortgage loan originally had a ten-year term with a 20-year amortization and a fixed interest rate of 8.23%. The mortgage was amended in September 2013 to extend the maturity date from April 2014 to April 2017, with the mortgage loan’s monthly payment amount and fixed interest rate each remaining unchanged.  The mortgage had a principal balance outstanding of $17.3 million as of June 30, 2016. The entire principal balance is recorded as current portion of long-term debt in the accompanying consolidated balance sheet as of June 30, 2016 as there is a balloon payment due in April 2017. Lexicon intends to refinance this debt prior to paying the balloon payment. The buildings and land that serve as collateral for the mortgage loan are included in property and equipment at $59.2 million and $2.7 million, respectively, before accumulated depreciation, as of June 30, 2016. The fair value of Lexicon’s mortgage loan approximates its carrying value.  The fair value of Lexicon’s mortgage loan was determined using Level 2 inputs using discounted cash flow analysis, based on the Company’s estimated current incremental borrowing rate.

9. Arrangements with Symphony Icon, Inc.

On June 15, 2007, Lexicon entered into a series of related agreements providing for the financing of the clinical development of certain of its drug candidates, including telotristat etiprate (LX1032) and LX1033, along with any other pharmaceutical compositions modulating the same targets as those drug candidates (the “Programs”). The agreements included a Novated and Restated Technology License Agreement pursuant to which the Company licensed to Symphony Icon, a then wholly-owned subsidiary of Symphony Icon Holdings LLC (“Holdings”), the Company's intellectual property rights related to the Programs. Holdings contributed $45 million to Symphony Icon in order to fund the clinical development of the Programs.

Under a Share Purchase Agreement, dated June 15, 2007, between the Company and Holdings, the Company issued and sold to Holdings 1,092,946 shares of its common stock on June 15, 2007 in exchange for $15 million and an exclusive purchase option (the “Purchase Option”) that gave the Company the right to acquire all of the equity of Symphony Icon, thereby allowing the Company to reacquire all of the Programs. On July 30, 2010, Lexicon entered into an Amended and Restated Purchase Option Agreement with Symphony Icon and Holdings and simultaneously exercised the Purchase Option, thereby reacquiring the Programs. Pursuant to the amended terms of the Purchase Option, Lexicon paid Holdings $10 million on July 30, 2010 and issued 1,891,074 shares of common stock to designees of Holdings on July 30, 2012 in satisfaction of an additional $35 million base payment obligation.

Lexicon also agreed to make up to $45 million in additional contingent payments, which will consist of 50% of any consideration Lexicon receives pursuant to any licensing transaction (a “Licensing Transaction”) under which Lexicon grants a third party rights to commercialize telotristat etiprate, LX1033 or other pharmaceutical compositions modulating the same target as those drug candidates (the “LG103 Programs”), subject to certain exceptions. The contingent payments will be due if and when Lexicon receives such consideration from a Licensing Transaction. In the event Lexicon receives regulatory approval in the United States for the marketing and sale of any product resulting from the LG103 Programs prior to entering into a Licensing Transaction for the commercialization of such product in the United States, in lieu of any contingent payment from such a Licensing Transaction, Lexicon will pay Holdings the sum of $15 million and the amount of certain expenses Lexicon incurred after its exercise of the Purchase Option which are attributable to the development of such product, reduced by up to 50% of such sum on account of any contingent payments paid prior to such United States regulatory approval attributable to any such Licensing Transaction outside of the United States with respect to such product. In the event Lexicon makes any such payment upon United States regulatory approval, Lexicon will have no obligation to make subsequent contingent payments attributable to any such Licensing Transactions for the commercialization of such product outside the United States until the proceeds of such Licensing Transactions exceed 50% of the payment made as a result of such United States regulatory approval. The contingent payments may be paid in cash or a combination of cash and common stock, in Lexicon’s discretion, provided that no more than 50% of any contingent payment will be paid in common stock. On December 4, 2014, Lexicon paid $5.8 million in cash and issued 666,111 shares of common stock to designees of Holdings in satisfaction of a $11.5 million contingent payment obligation as a result of receiving an upfront payment pursuant to Lexicon’s license and collaboration agreement with Ipsen Pharma SAS. On April 24, 2015, Lexicon paid $0.75 million in cash to Holdings in satisfaction of its contingent payment obligation as a result of receiving an additional upfront payment from Ipsen in March 2015 (see Note 11, Collaboration and License Agreements).

Lexicon accounted for the exercise of the Purchase Option and acquisition of Symphony Icon as a business combination. In connection with its acquisition of Symphony Icon, Lexicon paid $10.0 million in cash, and has also agreed to pay Holdings additional base and contingent payments as discussed above. The fair value of the base and contingent consideration payments was $45.6 million and was estimated by applying a probability-based income approach utilizing an appropriate discount rate. This estimation was based on significant inputs that are not observable in the market, referred to as Level 3 inputs. Key assumptions include: (1) a discount rate of 14% for the base payments; (2) a discount rate of 18% for the contingent payments; and (3) a probability adjusted contingency. The discount rate assumptions have not changed through

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June 30, 2016, and as programs progress, the probability adjusted contingency is adjusted as necessary. Subsequent changes in the fair value of the Symphony Icon purchase consideration liability are recorded as increase or decrease in fair value of Symphony Icon purchase liability expense in the accompanying consolidated statements of comprehensive loss. During the six months ended June 30, 2016 and 2015, the fair value of the Symphony Icon purchase consideration liability increased by $1.4 million and $1.7 million, respectively.

10.      Commitments and Contingencies

Operating Lease Obligations:  A Lexicon subsidiary leases office space in Basking Ridge, New Jersey under an operating lease agreement, the term of which began in June 2015 and terminates in December 2022. Rent expense is recognized on a straight-line basis over the lease term.  Lexicon is the guarantor of the obligations of its subsidiary under this lease agreement.  The maximum potential amount of future payments the Company could be required to make under this agreement is $4.0 million as of June 30, 2016. Additionally, Lexicon leases certain equipment under operating leases.

Legal Proceedings.  Lexicon is from time to time party to claims and legal proceedings that arise in the normal course of its business and that it believes will not have, individually or in the aggregate, a material adverse effect on its results of operations, financial condition or liquidity.

11. Collaboration and License Agreements

Lexicon has derived substantially all of its revenues from drug discovery and development collaborations, target validation collaborations for the development and, in some cases, analysis of the physiological effects of genes altered in knockout mice, government grants and contracts, technology licenses, subscriptions to its databases and compound library sales.

Sanofi. In November 2015, Lexicon entered into a Collaboration and License Agreement (the “Sanofi Agreement”) with Sanofi for the worldwide development of Lexicon’s diabetes drug candidate sotagliflozin (LX4211).

Under the Sanofi Agreement, Lexicon granted Sanofi an exclusive, worldwide, royalty-bearing right and license under its patent rights and know-how to develop, manufacture and commercialize sotagliflozin. Subject to specified exceptions, neither party may (a) perform clinical development activities relating to any other compound which inhibits sodium-glucose cotransporters type 1 or type 2 or (b) commercialize any such compounds in the United States, countries of the European Union and certain other specified countries, in each case during the royalty terms applicable in such countries. Among the specified exceptions is a right Lexicon retained to pursue the development of its LX2761 drug candidate, with respect to which Lexicon granted Sanofi certain rights of first negotiation specified in the Sanofi Agreement.

Under the Sanofi Agreement, Sanofi paid Lexicon an upfront payment of $300 million. In addition, Lexicon is eligible to receive from Sanofi (a) up to an aggregate of $430 million upon the achievement of specified development and regulatory milestones and (b) up to an aggregate of $990 million upon the achievement of specified sales milestones. Due to the uncertainty surrounding the achievement of the future development, regulatory and sales milestones, these payments will not be recognized as revenue unless and until they are earned as the Company is not able to reasonably predict if and when the milestones will be achieved. Lexicon is also entitled to tiered, escalating royalties ranging from low double digit percentages to forty percent of net sales of sotagliflozin, based on indication and territory, with royalties for the higher band of such range attributable to net sales for type 1 diabetes in the United States, and subject in each case to customary royalty reduction provisions. Royalties payable with respect to net sales of sotagliflozin for type 1 diabetes in the United States will also be reduced in the event Lexicon does not exercise its co-promotion option described below.

Lexicon will continue to be responsible for all clinical development activities relating to type 1 diabetes and will retain an exclusive option to co-promote and have a significant role, in collaboration with Sanofi, in the commercialization of sotagliflozin for the treatment of type 1 diabetes in the United States. If Lexicon exercises its co-promotion option, Lexicon will fund forty percent of the commercialization costs relating to such co-promotion activities. Sanofi will be responsible for all clinical development and commercialization of sotagliflozin for the treatment of type 2 diabetes worldwide and will be solely responsible for the commercialization of sotagliflozin for the treatment of type 1 diabetes outside the United States. Lexicon will share in the funding of a portion of the planned type 2 diabetes development costs over the next three years, up to an aggregate of $100 million. Sanofi will book sales worldwide in all indications.

The parties are responsible for using commercially reasonable efforts to perform their development and commercialization obligations pursuant to mutually approved development and commercialization plans.

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The parties’ activities under the Sanofi Agreement are governed by a joint steering committee and certain other governance committees which reflect equal or other appropriate representation from both parties. If the applicable governance committee is not able to make a decision by consensus and the parties are not able to resolve the issue through escalation to specified senior executive officers of the parties, then Sanofi will have final decision-making authority, subject to limitations specified in the Sanofi Agreement.

The Sanofi Agreement will expire upon the expiration of all applicable royalty terms for all licensed products in all countries. The royalty term for each licensed product in each country is the period commencing on the effective date of the Sanofi Agreement and ending on the latest of expiration of specified patent coverage, expiration of specified regulatory exclusivity and 10 years following the first commercial sale in the applicable country. Either party may terminate the Sanofi Agreement in the event of an uncured material breach by the other party. Prior to completion of the core development activities for type 2 diabetes specified in the development plan, Sanofi may terminate the Sanofi Agreement on a country-by-country and licensed product-by-licensed product basis, in the event of (a) notification of a material safety issue relating to the licensed product or the class of sodium-glucose cotransporters type 1 or type 2 inhibitors resulting in a recommendation or requirement that Lexicon or Sanofi cease development, (b) failure to achieve positive results with respect to certain clinical trial results, (c) the occurrence of specified fundamental adverse events or (d) the exploitation of the licensed product infringing third party intellectual property rights in specified major markets and Sanofi is unable to obtain a license to such third party intellectual property rights.

The Company considered the following deliverables with respect to the revenue recognition of the $300 million upfront payment:

• The exclusive worldwide license granted to Sanofi to develop and commercialize sotagliflozin;

• The development services Lexicon is performing for sotagliflozin relating to type 1 diabetes; and

• The funding Lexicon will provide for development relating to type 2 diabetes.

The Company determined that the license had stand-alone value because it is an exclusive license that gives Sanofi the right to develop and commercialize sotagliflozin or to sublicense its rights. In addition, sotagliflozin is currently in development and it is possible that Sanofi or another third party could conduct clinical trials without assistance from Lexicon. As a result, the Company considers the license and the development services under the Sanofi Agreement to be separate units of accounting. The Company recognized the portion of the consideration allocated to the license immediately because Lexicon delivered the license and earned the revenue at the inception of the arrangement. The Company is recognizing as revenue the amount allocated to the development services for type 1 diabetes and the obligation to provide funding for development services for type 2 diabetes over the period of time Lexicon performs services or provides funding, currently expected to be through 2020.

The Company determined that the initial allocable arrangement consideration was the $300 million upfront payment because it was the only payment that was fixed and determinable at the inception of the arrangement. There was considerable uncertainty at the date of the agreement as to whether Lexicon would earn milestone payments or royalty payments. As such, the Company did not include those payments in the allocable consideration. The Company allocated the allocable consideration based on the relative best estimate of selling price of each unit of accounting. The Company estimated the selling price of the license deliverable by applying a probability-based income approach utilizing an appropriate discount rate. The significant inputs the Company used to determine the projected income of the license included: exercising the option to copromote, estimated future product sales, estimated cost of goods sold, estimated operating expenses, income taxes, and an appropriate discount rate. The Company estimated the selling price of the development services for type 1 diabetes by using internal estimates of the cost to hire third parties to perform the services over the expected period to perform the development. The Company estimated the obligation to provide funding for type 2 diabetes by using internal estimates of the expected cash flows and timing for $100 million in funding.

As a result of the allocation, the Company recognized $126.8 million of the $300 million upfront payment for the license in 2015. The Company is recognizing the $113.8 million allocated to the development services deliverable and the $59.4 million allocated to the funding deliverable over the estimated period of performance as the development and funding occurs. Revenue recognized under the Sanofi Agreement was $31.7 million for the six months ended June 30, 2016.

Ipsen Pharma SAS. In October 2014, Lexicon entered into a License and Collaboration Agreement, which was subsequently amended in March 2015 (collectively, the “Ipsen Agreement”), with Ipsen Pharma SAS (“Ipsen”) for the development and commercialization of Lexicon’s drug candidate telotristat etiprate (LX1032) outside of the United States and Japan (the “Licensed Territory”).

Under the Ipsen Agreement, Lexicon granted Ipsen an exclusive, royalty-bearing right and license under its patent rights and know-how to commercialize telotristat etiprate in the Licensed Territory. Ipsen is responsible for using diligent

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efforts to commercialize telotristat etiprate in the Licensed Territory pursuant to a mutually approved commercialization plan. Subject to certain exceptions, Lexicon will be responsible for conducting clinical trials required to obtain regulatory approval for telotristat etiprate for carcinoid syndrome in the European Union, including those contemplated by a mutually approved initial development plan, and will have the first right to conduct most other clinical trials of telotristat etiprate. Lexicon is responsible for the costs of all clinical trials contemplated by the initial development plan. The costs of additional clinical trials will be allocated between the parties based on the nature of such clinical trials. Under the Ipsen Agreement, Ipsen has paid Lexicon an aggregate of $24.5 million through June 30, 2016. In addition, Lexicon is eligible to receive from Ipsen (a) up to an aggregate of approximately $34 million upon the achievement of specified regulatory and commercial launch milestones and (b) up to an aggregate of €72 million upon the achievement of specified sales milestones. Due to the uncertainty surrounding the achievement of the future regulatory and sales milestones, these payments will not be recognized as revenue unless and until they are earned as the Company is not able to reasonably predict if and when the milestones will be achieved. Lexicon is also entitled to tiered, escalating royalties ranging from low twenties to mid-thirties percentages of net sales of telotristat etiprate in the Licensed Territory, subject to a credit for amounts previously paid to Lexicon by Ipsen for the manufacture and supply of such units of telotristat etiprate. Lexicon’s receipt of these payments under the Ipsen Agreement triggers its obligation to make certain contingent payments to Holdings (see Note 9, Arrangements with Symphony Icon, Inc.). Lexicon and Ipsen have entered into a commercial supply agreement pursuant to which Lexicon will supply Ipsen’s commercial requirements of telotristat etiprate, and Ipsen will pay an agreed upon transfer price for such commercial supply.

The Company considered the following deliverables with respect to the revenue recognition of the $24.5 million upfront payments:

• The exclusive license granted to Ipsen to develop and commercialize telotristat etiprate in the Licensed Territory;

•The development services Lexicon is performing for telotristat etiprate;

• The obligation to participate in committees which govern the development of telotristat etiprate until commercialization; and

•The obligation to supply commercial supply of telotristat etiprate, under a commercial supply agreement.

The Company determined that the license had stand-alone value because it is an exclusive license that gives Ipsen the right to develop and commercialize telotristat etiprate or to sublicense its rights. In addition, telotristat etiprate is currently in development and it is possible that Ipsen or another third party could conduct clinical trials without assistance from Lexicon. As a result, the Company considers the license and the development services under the Ipsen Agreement to be separate units of accounting. The Company recognized the portion of the consideration allocated to the license immediately because Lexicon delivered the license and earned the revenue at the inception of the arrangement. The Company is recognizing as revenue the amount allocated to the development services and the obligation to participate in committees over the period of time Lexicon performs services, currently expected to be through mid-2017.

Due to the inherent uncertainty in obtaining regulatory approval, the applicability of the commercial supply agreement is outside the control of Lexicon and Ipsen. Accordingly, the Company has determined the commercial supply agreement is a contingent deliverable at the onset of the Ipsen Agreement. As a result, the Company has determined the commercial supply agreement does not meet the definition of a deliverable that needs to be accounted for at the inception of the arrangement. The Company has also determined that there is no significant and incremental discount related to the commercial supply agreement that should be accounted for at the inception of the arrangement.

The Company determined that the initial allocable arrangement consideration was the $24.5 million upfront payments because they were the only payments that were fixed and determinable at the inception of the arrangement. There was considerable uncertainty at the date of the agreement as to whether Lexicon would earn milestone payments, royalty payments or payments for finished drug product. As such, the Company did not include those payments in the allocable consideration. The Company allocated the allocable consideration based on the relative best estimate of selling price of each unit of accounting. The Company estimated the selling price of the license deliverable by applying a probability-based income approach utilizing an appropriate discount rate. The significant inputs the Company used to determine the projected income of the license included: estimated future product sales, estimated cost of goods sold, estimated operating expenses, income taxes, and an appropriate discount rate. The Company estimated the selling price of the development services by using internal estimates of the cost to hire third parties to perform the services over the expected period to perform the development. The Company estimated the selling price of the obligation to participate in committees by using internal estimates of the number of internal hours and salary and benefits costs to perform these services.

As a result of the allocation, the Company recognized $21.2 million of the $24.5 million upfront payments for the license in 2014, and an additional $1.4 million in 2015 upon entering into the amendment. The Company is recognizing the $1.7 million allocated to the development services deliverable over the estimated period of performance as development

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occurs, and is recognizing the $0.1 million allocated to the committee participation deliverable ratably over the estimated period of performance. Revenue recognized under the Ipsen Agreement was $0.2 million and $2.0 million for the six months ended June 30, 2016 and 2015, respectively.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Overview

We are a biopharmaceutical company focused on the development of breakthrough treatments for human disease.  We have advanced multiple drug candidates into clinical development and are presently devoting most of our resources to the development of our two most advanced drug candidates:

• We are developing telotristat etiprate, or LX1032, an orally-delivered small molecule drug candidate, as a treatment for carcinoid syndrome. We have reported positive top-line data from both our pivotal TELESTAR Phase 3 clinical trial and its companion TELECAST Phase 3 clinical trial of telotristat etiprate in carcinoid syndrome patients. We have submitted an application for regulatory approval to market telotristat etiprate in the United States and are presently preparing for the commercial launch of telotristat etiprate in the United States, if approved. We have granted Ipsen Pharma SAS an exclusive, royalty-bearing right to commercialize telotristat etiprate outside of the United States and Japan. Ipsen has submitted an application for regulatory approval to market telotristat etiprate in the European Union.

• We are developing sotagliflozin, or LX4211, an orally-delivered small molecule drug candidate, as a treatment for type 1 and type 2 diabetes. We have reported positive data from a Phase 2 clinical trial of sotagliflozin in type 1 diabetes patients and two additional Phase 2 clinical trials of sotagliflozin in type 2 diabetes patients. We have granted Sanofi an exclusive, worldwide, royalty-bearing right to develop, manufacture and commercialize sotagliflozin. We are presently conducting Phase 3 development of sotagliflozin for type 1 diabetes and preparing with Sanofi for Phase 3 development of sotagliflozin in type 2 diabetes.

Our most advanced drug candidates, as well as compounds from a number of additional drug discovery and development programs that we have advanced into various stages of clinical and preclinical development, originated from our own internal drug discovery efforts. These efforts were driven by a systematic, target biology-driven approach in which we used gene knockout technologies and an integrated platform of advanced medical technologies to systematically study the physiological and behavioral functions of almost 5,000 genes in mice and assessed the utility of the proteins encoded by the corresponding human genes as potential drug targets. We have identified and validated in living animals, or in vivo, more than 100 targets with promising profiles for drug discovery.

We are working both independently and through strategic collaborations and alliances with third parties to capitalize on our drug target discoveries and drug discovery and development programs. We seek to retain exclusive or co-exclusive rights to the benefits of certain drug discovery and development programs by developing and commercializing drug candidates from those programs internally, particularly in the United States for indications treated by specialist physicians. We seek to collaborate with other pharmaceutical and biotechnology companies, such as Ipsen, Sanofi and Bristol-Myers Squibb, with respect to drug discovery or the development and commercialization of certain of our drug candidates, particularly with respect to commercialization in territories outside the United States, commercialization in the United States for indications treated by primary care physicians, or when the collaboration may otherwise provide us with access to expertise and resources that we do not possess internally or are complementary to our own.

We have derived substantially all of our revenues from strategic collaborations and other research and development collaborations and technology licenses.  To date, we have generated a substantial portion of our revenues from a limited number of sources.

Our operating results and, in particular, our ability to generate additional revenues are dependent on many factors, including our success in obtaining regulatory approval for the marketing and sale of telotristat etiprate in the United States; if approved, our ability to successfully commercialize telotristat etiprate in the United States; the amount and timing of payments, if any, under our existing collaboration agreements with Sanofi, Ipsen and other entities; the success of our ongoing preclinical and clinical development efforts; our success in establishing new collaborations and licenses; the timing and willingness of such new collaborators to commercialize products that would result in milestone payments and royalties and their success in such efforts; and general and industry-specific economic conditions which may affect research and development expenditures. Future revenues from our existing collaborations are uncertain because they depend, to a large degree, on the achievement of milestones and payment of royalties we earn from any future products developed under the collaborations. Our ability to secure future revenue-generating agreements will depend upon our ability to address the needs of our potential future collaborators and licensees, and to negotiate agreements that we believe are in our long-term best interests. We may determine, as we have with certain of our drug candidates, including telotristat etiprate in the United States and Japan, that our interests are better served by retaining rights to our discoveries and advancing our therapeutic programs to a later stage, which could limit our near-term revenues and increase expenses. Because of these and other factors, our operating results have fluctuated in the past

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and are likely to do so in the future, and we do not believe that period-to-period comparisons of our operating results are a good indication of our future performance.

Since our inception, we have incurred significant losses and, as of June 30, 2016, we had an accumulated deficit of $1.2 billion. Our losses have resulted principally from costs incurred in research and development, general and administrative costs associated with our operations, and non-cash stock-based compensation expenses associated with stock options and restricted stock granted to employees and consultants. Research and development expenses consist primarily of salaries and related personnel costs, external research costs related to our nonclinical and clinical efforts, material costs, facility costs, depreciation on property and equipment, and other expenses related to our drug discovery and development programs. General and administrative expenses consist primarily of salaries and related expenses for executive and administrative personnel, professional fees and other corporate expenses, including information technology, facilities costs and general legal activities. We expect to continue to incur significant research and development costs in connection with the continuing development of our drug candidates. As a result, we will need to generate significantly higher revenues to achieve profitability.

Critical Accounting Policies

The preparation of financial statements in conformity with generally accepted accounting principles requires us to make judgments, estimates and assumptions in the preparation of our consolidated financial statements and accompanying notes.  Actual results could differ from those estimates.  We believe there have been no significant changes in our critical accounting policies as discussed in our Annual Report on Form 10-K for the year ended December 31, 2015.

Recent Accounting Pronouncements

See Note 4, Recent Accounting Pronouncements, of the Notes to Consolidated Financial Statements, for a discussion of the impact of the new accounting standards on our consolidated financial statements.

Results of Operations

Revenues

Total revenues and dollar and percentage changes as compared to the corresponding periods in the prior year are as follows (dollar amounts are presented in millions):

	Three Months Ended June 30,					Six Months Ended June 30,
	2016			2015		2016			2015
Total revenues	$	20.1		$	0.4	$	32.6		$	2.2
Dollar increase	$	19.7				$	30.4
Percentage increase	5,243		%			1,403		%

• Collaborative agreements – Revenue from collaborative agreements for the three months ended June 30, 2016 increased from $0.3 million to $20.0 million, and for the six months ended June 30, 2016 increased from $2.1 million to $32.5 million, primarily due to revenues recognized from the collaboration and license agreement with Sanofi.

Research and Development Expenses

Research and development expenses and dollar and percentage changes as compared to the corresponding periods in the prior year are as follows (dollar amounts are presented in millions):

	Three Months Ended June 30,					Six Months Ended June 30,
	2016			2015		2016			2015
Total research and development expense	$	48.2		$	20.8	$	85.2		$	41.6
Dollar increase	$	27.4				$	43.6
Percentage increase	132		%			105		%

Research and development expenses consist primarily of third-party and other services principally related to nonclinical and clinical development activities, salaries and other personnel-related expenses, stock-based compensation expense, and facility and equipment costs.

• Third-party and other services – Third-party and other services for the three months ended June 30, 2016 increased 180% to $40.5 million, and for the six months ended June 30, 2016 increased 146% to $70.1 million as compared to the corresponding periods in 2015, primarily due to increases in external clinical research and development costs.

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Third-party and other services relate principally to our clinical trial and related development activities, such as nonclinical and clinical studies and contract manufacturing.

• Personnel – Personnel costs for the three months ended June 30, 2016 increased 23% to $4.6 million, and for the six months ended June 30, 2016 increased 24% to $9.2 million, as compared to the corresponding periods in 2015, primarily due to increases in personnel. Salaries, bonuses, employee benefits, payroll taxes, recruiting and relocation costs are included in personnel costs.

• Stock-based compensation – Stock-based compensation expense for the three months ended June 30, 2016 increased 12% to $1.0 million, as compared to the corresponding period in 2015, and for the six months ended June 30, 2016 was $2.0 million, consistent with the corresponding period in 2015.

• Facilities and equipment – Facilities and equipment costs for the three months ended June 30, 2016 increased 15% to $0.7 million, and for the six months ended June 30, 2016 decreased 7% to $1.7 million, as compared to the corresponding periods in 2015.

• Other – Other costs for the three months ended June 30, 2016 increased 36% to $1.3 million, and for the six months ended June 30, 2016 increased 15% to $2.3 million, as compared to the corresponding periods in 2015.

Increase in Fair Value of Symphony Icon Liability

The fair value of the Symphony Icon purchase liability increased by $0.5 million in the three months ended June 30, 2016, decreased by $12,000 for the three months ended June 30, 2015, and increased by $1.4 million and $1.7 million for the six months ended June 30, 2016 and 2015, respectively (see Note 9, Arrangements with Symphony Icon, Inc., of the Notes to Consolidated Financial Statements, for more information).

General and Administrative Expenses

General and administrative expenses and dollar and percentage changes as compared to the corresponding periods in the prior year are as follows (dollar amounts are presented in millions):

	Three Months Ended June 30,					Six Months Ended June 30,
	2016			2015		2016			2015
Total general and administrative expense	$	8.4		$	6.3	$	16.8		$	12.0
Dollar increase	$	2.1				$	4.8
Percentage increase	33		%			40		%

General and administrative expenses consist primarily of professional fees such as marketing and legal fees, personnel costs to support our research and development activities, stock-based compensation expenses, and facility and equipment costs.

• Professional fees – Professional fees for the three months ended June 30, 2016 increased 67% to $3.6 million, and for the six months ended June 30, 2016 increased 115% to $7.0 million, as compared to the corresponding periods in 2015, primarily due to increased consulting costs in preparation for commercialization of telotristat etiprate.

• Personnel – Personnel costs for the three months ended June 30, 2016 increased 17% to $2.9 million, and for the six months ended June 30, 2016 increased 15% to $6.0 million, as compared to the corresponding periods in 2015, primarily due to increases in personnel. Salaries, bonuses, employee benefits, payroll taxes, recruiting and relocation costs are included in personnel costs.

• Stock-based compensation – Stock-based compensation expense for the three months ended June 30, 2016 increased 7% to $1.0 million, as compared to the corresponding period in 2015, and for the six months ended June 30, 2016 was $1.8 million, consistent with the corresponding period in 2015.

• Facilities and equipment – Facilities and equipment costs for the three months ended June 30, 2016 increased 78% to $0.4 million, and for the six months ended June 30, 2016 increased 48% to $0.7 million, as compared to the corresponding periods in 2015.

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• Other – Other costs for the three months ended June 30, 2016 was $0.5 million, and for the six months ended June 30, 2016 was $1.2 million, consistent with the corresponding periods in 2015.

Interest Expense and Interest and Other Income (Expense), Net

Interest Expense.  Interest expense for the three months ended June 30, 2016 and 2015 was $1.6 million and $1.7 million, respectively, and for the six months ended June 30, 2016 and 2015 was $3.3 million and $3.4 million, respectively.

Interest and Other Income (Expense), Net. Interest and other income, net for the three months ended June 30, 2016 and 2015 was $0.5 million and $0.3 million, respectively, and for the six months ended June 30, 2016 and 2015 was $1.2 million and $0.4 million, respectively.

Consolidated Net Loss and Consolidated Net Loss per Common Share

Consolidated Net Loss and Consolidated Net Loss per Common Share. Consolidated net loss increased to $38.1 million in the three months ended June 30, 2016 from $28.1 million in the corresponding period in 2015. Consolidated net loss per common share increased to $0.37 in the three months ended June 30, 2016 from $0.27 in the corresponding period in 2015. Consolidated net loss increased to $73.0 million in the six months ended June 30, 2016 from $56.2 million in the corresponding period in 2015. Consolidated net loss per common share increased to $0.70 in the six months ended June 30, 2016 from $0.54 in the corresponding period in 2015.

Our quarterly operating results have fluctuated in the past and are likely to do so in the future, and we believe that quarter-to-quarter comparisons of our operating results are not a good indication of our future performance.

Liquidity and Capital Resources

We have financed our operations from inception primarily through sales of common and preferred stock, contract and milestone payments to us under our strategic and other collaborations, target validation, database subscription and technology license agreements, government grants and contracts, and financing under debt and lease arrangements. We have also financed certain of our research and development activities under our agreements with Symphony Icon, Inc. From our inception through June 30, 2016, we had received net proceeds of $1.3 billion from issuances of common and preferred stock. In addition, from our inception through June 30, 2016, we received $783.1 million in cash payments from strategic and other collaborations, target validation, database subscription and technology license agreements, sales of compound libraries and reagents, and government grants and contracts, of which $630.2 million had been recognized as revenues through June 30, 2016.

As of June 30, 2016, we had $429.4 million in cash, cash equivalents and investments. As of December 31, 2015, we had $521.4 million in cash, cash equivalents and investments. We used cash of $91.6 million in operations in the six months ended June 30, 2016. This consisted primarily of the consolidated net loss for the period of $73.0 million and a net decrease in other operating liabilities net of assets of $25.2 million, partially offset by non-cash charges of $3.8 million related to stock-based compensation expense, $1.4 million related to the increase in fair value of the Symphony Icon purchase liability, and $1.0 million related to depreciation expense. Investing activities used cash of $72.1 million in the six months ended June 30, 2016, primarily due to net purchases of investments of $72.0 million. Financing activities used cash of $0.9 million, primarily due to repayment of debt borrowings of $1.0 million and repurchase of common stock of $0.6 million, partially offset by proceeds from issuance of common stock of $0.8 million.

Symphony Drug Development Financing Agreements. In June 2007, we entered into a series of related agreements providing for the financing of the clinical development of certain drug programs, including telotristat etiprate, along with any other pharmaceutical compositions modulating the same targets as those drug candidates. Under the financing arrangement, we licensed to Symphony Icon, Inc., a then wholly-owned subsidiary of Symphony Icon Holdings LLC, our intellectual property rights related to the programs and Holdings contributed $45 million to Symphony Icon in order to fund the clinical development of the programs. We also issued and sold to Holdings shares of our common stock in exchange for $15 million and received an exclusive option to acquire all of the equity of Symphony Icon, thereby allowing us to reacquire the programs.

Upon the recommendation of Symphony Icon’s development committee, which was comprised of an equal number of representatives from us and Symphony Icon, Symphony Icon’s board of directors had the right to require us to pay Symphony Icon up to $15 million for Symphony Icon’s use in the development of the programs in accordance with a specified development plan and related development budget. Symphony Icon’s board of directors requested that we pay Symphony Icon $9.3 million under the agreement, all of which was paid prior to the exercise of the purchase option in July 2010.

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In July 2010, we entered into an amended and restated purchase option agreement with Symphony Icon and Holdings and simultaneously exercised our purchase option. Pursuant to the amended terms of the purchase option, we paid Holdings $10 million in July 2010 and issued 1,891,074 shares of common stock to designees of Holdings in July 2012 in satisfaction of an additional $35 million base payment obligation.

We also agreed to make up to $45 million in additional contingent payments, which will consist of 50% of any consideration we receive pursuant to any licensing transaction under which we grant a third party rights to commercialize telotristat etiprate or other pharmaceutical compositions modulating the same target as those drug candidates, which we refer to as the “LG103 programs,” subject to certain exceptions. The contingent payments will be due if and when we receive such consideration from such a licensing transaction. In the event we receive regulatory approval in the United States for the marketing and sale of any product resulting from the LG103 programs prior to entering into such a licensing transaction for the commercialization of such product in the United States, in lieu of any contingent payment from such a licensing transaction, we will pay Holdings the sum of $15 million and the amount of certain expenses we incurred after our exercise of the purchase option which are attributable to the development of such product, reduced by up to 50% of such sum for the amount of any contingent payments paid prior to such United States regulatory approval attributable to any such licensing transaction outside of the United States with respect to such product. In the event we make any such payment upon United States regulatory approval, we will have no obligation to make subsequent contingent payments attributable to any such licensing transactions for the commercialization of such product outside the United States until the proceeds of such licensing transactions exceed 50% of the payment made as a result of such United States regulatory approval.

The contingent payments may be paid in cash or a combination of cash and common stock, in our discretion, provided that no more than 50% of any contingent payment will be paid in common stock. On December 4, 2014, we paid $5.8 million in cash and issued 666,111 shares of common stock to designees of Holdings in satisfaction of a $11.5 million contingent payment obligation as a result of receiving an upfront payment pursuant to our license and collaboration agreement with Ipsen Pharma SAS. On April 24, 2015, we paid $0.75 million in cash to Holdings in satisfaction of our contingent payment obligation as a result of receiving an additional upfront payment from Ipsen in March 2015 (see Note 11, Collaboration and License Agreements, of the Notes to Consolidated Financial Statements, for more information).

Texas Institute for Genomic Medicine. In July 2005, we received an award from the Texas Enterprise Fund for the creation of a knockout mouse embryonic stem cell library containing 350,000 cell lines for the Texas Institute for Genomic Medicine, or TIGM, using our proprietary gene trapping technology, which we completed in 2007. We also equipped TIGM with the bioinformatics software required for the management and analysis of data relating to the library. The Texas Enterprise Fund made an additional award to the Texas A&M University System for the creation of facilities and infrastructure to house the library.

Under the terms of our award, we are responsible for the creation of a specified number of jobs beginning in 2012, reaching an aggregate of 1,616 new jobs in Texas by December 31, 2016. We will receive credits against those job obligations based on funding received by TIGM and certain related parties from sources other than the State of Texas. We will also receive credits against those jobs obligations for any surplus jobs we create. We may be required to repay the state a portion of the award if we fail to meet those job obligations. Subject to these credits, if we fail to create the specified number of jobs, the State may require us to repay $2,415 for each job we fall short beginning in 2013. Our maximum aggregate exposure for such payments, if we fail to create any new jobs, is approximately $14.2 million, including $6.4 million through 2016, without giving effect to any credits to which we may be entitled.

Facilities. In April 2004, we obtained a $34.0 million mortgage on our facilities in The Woodlands, Texas. The mortgage loan originally had a ten-year term with a 20-year amortization and a fixed interest rate of 8.23%. The mortgage was amended in September 2013 to extend the maturity date from April 2014 to April 2017, with the mortgage loan’s monthly payment amount and fixed interest rate each remaining unchanged.  The mortgage had a principal balance outstanding of $17.3 million as of June 30, 2016. The entire principal balance is recorded as current portion of long-term debt in the accompanying consolidated balance sheet as of June 30, 2016 as there is a balloon payment due in April 2017. Lexicon intends to refinance this debt prior to paying the balloon payment.

In March 2015, our subsidiary Lexicon Pharmaceuticals (New Jersey), Inc. leased a 25,000 square-foot office space in Basking Ridge, New Jersey. The term of the lease extends from June 1, 2015 through December 31, 2022, and provides for escalating yearly base rent payments starting at $482,000 and increasing to $646,000 in the final year of the lease. We are the guarantor of the obligations of our subsidiary under the lease.

Our future capital requirements will be substantial and will depend on many factors, including the amount and timing of payments, if any, under our existing collaboration agreements with Sanofi, Ipsen and other entities, our ability to establish new collaborations and licenses and the amount and timing of payments under such agreements, the level and timing of our

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research, development and commercialization expenditures, market acceptance of our products, the resources we devote to developing and supporting our products and other factors. Our capital requirements will also be affected by any expenditures we make in connection with license agreements and acquisitions of and investments in complementary technologies and businesses. We expect to devote substantial capital resources to seek regulatory approval for and, if approved, to commercialize our drug candidates, to continue and expand our development efforts, and for other general corporate activities. We believe that our current unrestricted cash and investment balances and cash and revenues we expect to derive from strategic and other collaborations and other sources will be sufficient to fund our operations for at least the next 12 months. During or after this period, if cash generated by operations is insufficient to satisfy our liquidity requirements, we will need to sell additional equity or debt securities or obtain additional credit arrangements. Additional financing may not be available on terms acceptable to us or at all. The sale of additional equity or convertible debt securities may result in additional dilution to our stockholders.

Disclosure about Market Risk

We are exposed to limited market and credit risk on our cash equivalents which have maturities of three months or less at the time of purchase. We maintain a short-term investment portfolio which consists of U.S. Treasury bills and corporate debt securities that mature three to 12 months from the time of purchase, which we believe are subject to limited market and credit risk. We currently do not hedge interest rate exposure or hold any derivative financial instruments in our investment portfolio.

We had approximately $429.4 million in cash and cash equivalents and short-term investments as of June 30, 2016. We believe that the working capital available to us will be sufficient to fund our operations for at least the next 12 months.

We have operated primarily in the United States and substantially all sales to date have been made in U.S. dollars. Accordingly, we have not had any material exposure to foreign currency rate fluctuations.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

See “Disclosure about Market Risk” under “Item 2. Management’s Discussion and Analysisof Financial Condition and Results of Operations” for quantitative and qualitative disclosures about market risk.

Item 4. Controls and Procedures

Our principal executive officer and principal financial officer have concluded that our disclosure controls and procedures (as defined in rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934) are effective to ensure that the information required to be disclosed by us in the reports we file under the Securities Exchange Act is gathered, analyzed and disclosed with adequate timeliness, accuracy and completeness, based on an evaluation of such controls and procedures as of the end of the period covered by this report.

Subsequent to our evaluation, there were no significant changes in internal controls or other factors that could significantly affect internal controls, including any corrective actions with regard to significant deficiencies and material weaknesses.

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Part II -- Other Information 

Item 1. Legal Proceedings

We are from time to time party to claims and legal proceedings that arise in the normal course of our business and that we believe will not have, individually or in the aggregate, a material adverse effect on our results of operations, financial condition or liquidity.

Item 1A. Risk Factors

The following risks and uncertainties are important factors that could cause actual results or events to differ materially from those indicated by forward-looking statements. The factors described below are not the only ones we face and additional risks and uncertainties not presently known to us or that we currently deem immaterial also may impair our business operations.

Risks Related to Our Need for Additional Financing and Our Financial Results

• We will need additional capital in the future and, if it is unavailable, we will be forced to significantly curtail or cease our operations. If it is not available on reasonable terms, we will be forced to obtain funds, if at all, by entering into financing agreements on unattractive terms.

• We have a history of net losses, and we expect to continue to incur net losses and may not achieve or maintain profitability.

• Our operating results have been and likely will continue to fluctuate, and we believe that period-to-period comparisons of our operating results are not a good indication of our future performance.

• We have substantial indebtedness that may limit cash flow available to invest in the ongoing needs of our business.

• We may not have the ability to raise the funds necessary to repurchase the notes evidencing our existing indebtedness upon a fundamental change, and our future debt may contain limitations on our ability to repurchase the notes.

Risks Related to Our Drug Candidates

• We are dependent on the successful development and commercialization of telotristat etiprate and sotagliflozin.

• Clinical testing of our drug candidates in humans is an inherently risky and time-consuming process that may fail to demonstrate safety and efficacy, which could result in the delay, limitation or prevention of regulatory approval.

• Our drug candidates are subject to a lengthy and uncertain regulatory process that may not result in the necessary regulatory approvals, which could adversely affect our and our collaborators’ ability to commercialize products.

• If our potential products receive regulatory approval, we or our collaborators will remain subject to extensive and rigorous ongoing regulation.

• The commercial success of any products that we or our collaborators may develop will depend upon the degree of market acceptance of our products among physicians, patients, health care payors, private health insurers and the medical community.

• If we are unable to establish sales, marketing and distribution capabilities or enter into agreements with third parties to market and sell our drug candidates, we may be unable to generate product revenues.

• We are subject to certain healthcare laws, regulation and enforcement; our failure to comply with those laws could have a material adverse effect on our results of operations and financial condition.

• If we are unable to obtain adequate coverage and reimbursement from third-party payors for any products that we or our collaborators may develop, our revenues and prospects for profitability will suffer.

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• Current healthcare laws and regulations and future legislative or regulatory reforms to the healthcare system may negatively affect our revenues and prospects for profitability.

• Our competitors may develop products that make our or our collaborators’ products obsolete.

• We may not be able to manufacture our drug candidates in commercial quantities, which would prevent us from commercializing our drug candidates.

Risks Related to Our Relationships with Third Parties

• We are significantly dependent upon our collaborations with Ipsen, Sanofi and other pharmaceutical and biotechnology companies. If pharmaceutical products are not successfully and timely developed and commercialized under our collaborations, our opportunities to generate revenues from milestones and royalties will be greatly reduced.

• Conflicts with our collaborators could jeopardize the success of our collaborative agreements and harm our product development efforts.

• We rely on third parties to carry out drug development activities.

• We lack the capability to manufacture materials for nonclinical studies, clinical trials or commercial sales and rely on third parties to manufacture our drug candidates, which may harm or delay our product development and commercialization efforts.

Risks Related to Our Intellectual Property

• If we are unable to adequately protect our intellectual property, third parties may be able to use our products and technologies, which could adversely affect our ability to compete in the market.

• We may be involved in patent litigation and other disputes regarding intellectual property rights and may require licenses from third parties for our planned nonclinical and clinical development and commercialization activities. We may not prevail in any such litigation or other dispute or be able to obtain required licenses.

• We have not sought patent protection outside of the United States for some of our inventions, and some of our licensed patents only provide coverage in the United States. As a result, our international competitors could be granted foreign patent protection with respect to our discoveries.

• We may be subject to damages resulting from claims that we, our employees or independent contractors have wrongfully used or disclosed alleged trade secrets of their former employers.

Risks Related to Employees, Advisors and Facilities Operations

• The loss of key personnel or the inability to attract and retain additional personnel could impair our ability to expand our operations.

• Our collaborations with outside scientists may be subject to restriction and change.

• Security breaches may disrupt our operations and harm our operating results.

Risks Related to Environmental and Product Liability

• We use hazardous chemicals and radioactive and biological materials in our business. Any claims relating to improper handling, storage or disposal of these materials could be time consuming and costly.

• We may be sued for product liability.

Risks Related to Our Common Stock

• Invus, L.P., Invus C.V. and their affiliates own a controlling interest in our outstanding common stock and may have interests which conflict with those of our other stockholders.

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• Conversion of the notes evidencing our current indebtedness may dilute the ownership interest of our existing stockholders, including holders who had previously converted their notes, or may otherwise depress the price of our common stock.

• Invus has additional rights under our stockholders’ agreement with Invus, L.P. which provides Invus with substantial influence over certain significant corporate matters.

• Our stock price may be extremely volatile.

• We may engage in future acquisitions, which may be expensive and time consuming and from which we may not realize anticipated benefits.

• Future sales of our common stock may depress our stock price.

• If we are unable to meet Nasdaq continued listing requirements, Nasdaq may take action to delist our common stock.

For additional discussion of the risks and uncertainties that affect our business, see “Item 1A. Risk Factors” included in our annual report on Form 10-K for the year ended December 31, 2015 as filed with the Securities and Exchange Commission.

Item 6. Exhibits

Exhibit No.		Description
31.1	—	Certification of Principal Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	—	Certification of Principal Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1	—	Certification of Principal Executive and Principal Financial Officers Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS	—	XBRL Instance Document
101.SCH	—	XBRL Taxonomy Extension Schema Document
101.CAL	—	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	—	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	—	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	—	XBRL Taxonomy Extension Presentation Linkbase Document

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Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		Lexicon Pharmaceuticals, Inc.
Date:	August 4, 2016	By:	/s/ Lonnel Coats
			Lonnel Coats
			President and Chief Executive Officer

Date:	August 4, 2016	By:	/s/ Jeffrey L. Wade
			Jeffrey L. Wade
			Executive Vice President, Corporate and Administrative Affairs and Chief Financial Officer

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Index to Exhibits

Exhibit No.		Description
31.1	—	Certification of Principal Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	—	Certification of Principal Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1	—	Certification of Principal Executive and Principal Financial Officers Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS	—	XBRL Instance Document
101.SCH	—	XBRL Taxonomy Extension Schema Document
101.CAL	—	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	—	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	—	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	—	XBRL Taxonomy Extension Presentation Linkbase Document

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EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Lonnel Coats, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Lexicon Pharmaceuticals, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 4, 2016

/s/ Lonnel Coats

Lonnel Coats

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Jeffrey L. Wade, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Lexicon Pharmaceuticals, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 4, 2016

/s/ Jeffrey L. Wade

Jeffrey L. Wade

Executive Vice President, Corporate and Administrative Affairs and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. 1350, as adopted), Lonnel Coats, Principal Executive Officer of Lexicon Pharmaceuticals, Inc. (“Lexicon”), and Jeffrey L. Wade, Principal Financial Officer of Lexicon, each hereby certify that:

1. Lexicon's Quarterly Report on Form 10-Q for the period ended June 30, 2016, and to which this Certification is attached as Exhibit 32.1 (the “Periodic Report”), fully complies with the requirements of section 13(a) or section 15(d) of the Securities Exchange Act of 1934, and

2. The information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results of operations of Lexicon.

IN WITNESS WHEREOF, the undersigned have set their hands hereto as of the 4th day of August, 2016.

By:	/s/ Lonnel Coats
	Lonnel Coats
	President and Chief Executive Officer

By:	/s/ Jeffrey L. Wade
	Jeffrey L. Wade
	Executive Vice President, Corporate and Administrative Affairs and Chief Financial Officer

XML

Document and Entity Information Document - shares	6 Months Ended
	Jun. 30, 2016	Aug. 01, 2016
Document Information [Line Items]
Entity Registrant Name	LEXICON PHARMACEUTICALS, INC./DE
Entity Central Index Key	0001062822
Document Type	10-Q
Document Period End Date	Jun. 30, 2016
Amendment Flag	false
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		103,865,713

XML

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 38,410	$ 202,989
Short-term investments	390,955	318,363
Accounts receivable, net of allowances of $4	1,018	911
Prepaid expenses and other current assets	9,071	10,137
Total current assets	439,454	532,400
Property and equipment, net of accumulated depreciation and amortization of $58,855 and $59,428, respectively	20,350	21,227
Goodwill	44,543	44,543
Other intangible assets	53,357	53,357
Other assets	430	433
Total assets	558,134	651,960
Current liabilities:
Accounts payable	28,225	19,725
Accrued liabilities	23,950	24,757
Current portion of deferred revenue	61,528	76,499
Current portion of long-term debt, net of deferred issuance costs	17,289	1,976
Total current liabilities	130,992	122,957
Deferred revenue, net of current portion	92,188	109,151
Long-term debt, net of deferred issuance costs	84,909	100,960
Deferred tax liabilities	18,675	18,675
Other long-term liabilities	14,037	14,367
Total liabilities	340,801	366,110
Commitments and contingencies
Equity:
Preferred stock, $.01 par value; 5,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $.001 par value; 225,000 shares authorized; 104,152 and 103,860 shares issued, respectively	104	104
Additional paid-in capital	1,402,190	1,397,646
Accumulated deficit	(1,181,929)	(1,108,934)
Accumulated other comprehensive gain (loss)	336	(219)
Treasury stock, at cost, 306 and 237 shares, respectively	(3,368)	(2,747)
Total equity	217,333	285,850
Total liabilities and equity	$ 558,134	$ 651,960

XML

Balance Sheet Parenthetical (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Allowances for accounts receivable	$ 4	$ 4
Accumulated depreciation and amortization, property and equipment	$ 58,855	$ 59,428
Preferred stock, par value per share	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value per share	$ 0.001	$ 0.001
Common stock, shares authorized	225,000	225,000
Treasury stock, shares	306	237
Common Stock
Common stock, shares issued	104,152	103,860

XML

Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues:
Collaborative agreements	$ 20,001	$ 338	$ 32,495	$ 2,130
Subscription and license fees	88	38	88	38
Total revenues	20,089	376	32,583	2,168
Operating expenses:
Research and development, including stock-based compensation of $973, $868, $1,962 and $1,972, respectively	48,216	20,769	85,218	41,634
Increase (decrease) in fair value of Symphony Icon, Inc. purchase liability	478	(12)	1,443	1,741
General and administrative, including stock-based compensation of $984, $920, $1,830 and $1,769, respectively	8,416	6,307	16,814	12,008
Total operating expenses	57,110	27,064	103,475	55,383
Loss from operations	(37,021)	(26,688)	(70,892)	(53,215)
Interest expense	(1,638)	(1,655)	(3,287)	(3,357)
Interest and other income, net	547	269	1,184	422
Net loss	$ (38,112)	$ (28,074)	$ (72,995)	$ (56,150)
Net loss per common share, basic and diluted	$ (0.37)	$ (0.27)	$ (0.70)	$ (0.54)
Shares used in computing consolidated net loss per common share, basic and diluted	103,830	103,608	103,756	103,562
Unrealized gain on investments	$ 39	$ 75	$ 555	$ 161
Comprehensive loss	$ (38,073)	$ (27,999)	$ (72,440)	$ (55,989)

XML

Statements of Comprehensive Loss Parenthetical (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stock-based compensation expense associated with research and development expense	$ 973	$ 868	$ 1,962	$ 1,972
Stock-based compensation expense associated with general and administrative expense	$ 984	$ 920	$ 1,830	$ 1,769

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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Gain (Loss)	Treasury Stock
Balance, shares at Dec. 31, 2014		103,663
Balance, value at Dec. 31, 2014	$ 284,018	$ 104	$ 1,390,619	$ (1,104,252)	$ (63)	$ (2,390)
Stock-based compensation	3,741	$ 0	3,741	0	0	0
Issuance of common stock under Equity Incentive Plans, shares		188
Issuance of common stock under Equity Incentive Plans, value	0	$ 0	0	0	0	0
Repurchase of common stock	(357)	0	0	0	0	(357)
Net loss	(56,150)	0	0	(56,150)	0	0
Unrealized gain on investments	161	0	0	0	161	0
Other	61	$ 0	61	0	0	0
Balance, shares at Jun. 30, 2015		103,851
Balance, value at Jun. 30, 2015	231,474	$ 104	1,394,421	(1,160,402)	98	(2,747)
Balance, shares at Dec. 31, 2015		103,860
Balance, value at Dec. 31, 2015	285,850	$ 104	1,397,646	(1,108,934)	(219)	(2,747)
Stock-based compensation	3,792	$ 0	3,792	0	0	0
Issuance of common stock under Equity Incentive Plans, shares		292
Issuance of common stock under Equity Incentive Plans, value	752	$ 0	752	0	0	0
Repurchase of common stock	(621)	0	0	0	0	(621)
Net loss	(72,995)	0	0	(72,995)	0	0
Unrealized gain on investments	555	$ 0	0	0	555	0
Balance, shares at Jun. 30, 2016		104,152
Balance, value at Jun. 30, 2016	$ 217,333	$ 104	$ 1,402,190	$ (1,181,929)	$ 336	$ (3,368)

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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net loss	$ (72,995)	$ (56,150)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:
Depreciation and amortization	1,037	601
Increase in fair value of Symphony Icon, Inc. purchase liability	1,443	1,741
Stock-based compensation	3,792	3,741
Amortization of debt issuance costs	250	241
(Gain) loss on disposal of property and equipment	12	(59)
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(107)	719
(Increase) decrease in prepaid expenses and other current assets	1,066	(2,387)
Increase in other assets	0	(413)
Increase (decrease) in accounts payable and other liabilities	5,818	(3,326)
Decrease in deferred revenue	(31,934)	(371)
Net cash used in operating activities	(91,618)	(55,663)
Cash flows from investing activities:
Purchases of property and equipment	(67)	(480)
Proceeds from disposal of property and equipment	0	334
Purchases of investments	(219,437)	(70,505)
Maturities of investments	147,400	0
Net cash used in investing activities	(72,104)	(70,651)
Cash flows from financing activities:
Proceeds from issuance of common stock	752	0
Repurchase of common stock	(621)	(357)
Repayment of debt borrowings	(988)	(912)
Other financing activities	0	61
Net cash used in financing activities	(857)	(1,208)
Net decrease in cash and cash equivalents	(164,579)	(127,522)
Cash and cash equivalents at beginning of period	202,989	137,266
Cash and cash equivalents at end of period	38,410	9,744
Supplemental disclosure of cash flow information:
Cash paid for interest	3,046	3,184
Supplemental disclosure of non-cash investing and financing activities:
Unrealized gain on investments	$ 555	$ 161

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Basis of Presentation

6 Months Ended

Jun. 30, 2016

Basis of Presentation [Abstract]

Organization, Consolidation and Presentation of Financial Statements Disclosure

Basis of Presentation

The accompanying unaudited consolidated financial statements of Lexicon Pharmaceuticals, Inc. (“Lexicon” or the “Company”) have been prepared in accordance with generally accepted accounting principles for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. Operating results for the six-month period ended June 30, 2016 are not necessarily indicative of the results that may be expected for the year ended December 31, 2016.

The accompanying consolidated financial statements include the accounts of Lexicon and its wholly-owned subsidiaries. Intercompany transactions and balances are eliminated in consolidation.

For further information, refer to the financial statements and footnotes thereto included in Lexicon’s annual report on Form 10-K for the year ended December 31, 2015, as filed with the SEC.

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Net Loss Per Share

6 Months Ended

Jun. 30, 2016

Net Loss Per Share [Abstract]

Earnings Per Share

Net Loss Per Share

Net loss per share is computed using the weighted average number of shares of common stock outstanding during the applicable period and excludes shares underlying convertible debt, stock options and restricted stock units because they are antidilutive.  There are no differences between basic and diluted net loss per share for all periods presented.

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Stock-Based Compensation

6 Months Ended

Jun. 30, 2016

Stock-Based Compensation [Abstract]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

Stock-Based Compensation

The Company recorded $2.0 million and $1.8 million of stock-based compensation expense for the three months ended June 30, 2016 and 2015, respectively. The Company recorded $3.8 million and $3.7 million of stock-based compensation expense for the six months ended June 30, 2016 and 2015, respectively.  The Company utilized the Black-Scholes valuation model for estimating the fair value of the stock compensation granted, with the following weighted-average assumptions for options granted in the six months ended June 30, 2016 and 2015:

	Expected Volatility		Risk-free Interest Rate		Expected Term	Dividend Rate
June 30, 2016:
Employees	63	%	1.1	%	4	—	%
Officers and non-employee directors	83	%	1.6	%	8	—	%
June 30, 2015:
Employees	63	%	1.2	%	4	—	%
Officers and non-employee directors	81	%	1.8	%	8	—	%

The following is a summary of option activity under Lexicon’s stock-based compensation plans for the six months ended June 30, 2016:

	Options		Weighted Average Exercise Price
	(in thousands)
Outstanding at December 31, 2015	4,217		$	12.35
Granted	1,130		9.23
Exercised	(66	)	9.98
Expired	(166	)	27.36
Forfeited	(12	)	8.65
Outstanding at June 30, 2016	5,103		11.21
Exercisable at June 30, 2016	2,911		$	12.94

During the six months ended June 30, 2016, Lexicon also granted its employees annual restricted stock units. These restricted stock units vest in four annual installments. The following is a summary of restricted stock units activity under Lexicon’s stock-based compensation plans for the six months ended June 30, 2016:

	Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Outstanding at December 31, 2015	637		$	8.74
Granted	496		8.20
Vested	(206	)	9.75
Forfeited	(33	)	10.95
Nonvested at June 30, 2016	894		$	8.12

During the six months ended June 30, 2016, Lexicon granted its non-employee directors 11,456 shares of restricted stock awards. The restricted stock awards had a weighted average grant date fair value of $13.96 per share and vested immediately.

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Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2016

Recent Accounting Pronouncements [Abstract]

New Accounting Pronouncements, Policy

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers”, which amends FASB ASC Topic 606. ASU 2014-09 provides a single, comprehensive revenue recognition model for all contracts with customers. This standard contains principles for the determination of the measurement of revenue and the timing of when such revenue is recognized. Revenue recognition will reflect the transfer of goods or services to customers at an amount that is expected to be earned in exchange for those goods or services. ASU 2014-09 was scheduled to be effective for annual reporting periods beginning after December 15, 2016, and early adoption was not permitted. In August 2015, the FASB issued ASU No. 2015-14, “Revenue from Contracts with Customers: Deferral of Effective Date”, which defers the effective date of ASU 2014-09 by one year. ASU 2014-19 is now effective for annual periods after December 15, 2017 including interim periods within that reporting period. Early application is permitted only for annual periods beginning after December 15, 2016, including interim periods within that reporting period. Management is currently evaluating the impact of these pronouncements on Lexicon’s consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, “Simplifying the Presentation of Debt Issuance Costs.” ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. During the six months ended June 30, 2016, the Company adopted ASU No. 2015-03 retrospectively for all periods presented in the accompanying consolidated balance sheets. The reclassification of debt issuance costs resulted in reductions in other assets, current portion of long-term debt and long-term debt of $2.9 million, $39,000 and $2.8 million, respectively, as of December 31, 2015.

In November 2015, the FASB issued ASU No. 2015-17, “Income Taxes.” ASU 2015-17 simplifies the presentation of deferred income taxes, requiring that deferred tax assets and liabilities be classified as noncurrent in a classified balance sheet. The pronouncement is effective for fiscal years, and interim periods within those years, beginning after December 31, 2016, and early adoption is permitted. Management does not expect the adoption of this pronouncement to have a material impact on Lexicon’s consolidated financial statements.

In January 2016, the FASB issued ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2016-01 requires that most equity investments be measured at fair value, with subsequent changes in fair value recognized in net income. The pronouncement also impacts financial liabilities under the fair value option and the presentation and disclosure requirements for financial instruments. This pronouncement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017, and early adoption is not permitted. Management does not expect the adoption of this pronouncement to have a material impact on Lexicon’s consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, “Leases.” ASU 2016-02 requires companies that lease assets to recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in its balance sheet. The pronouncement will also require additional disclosures about the amount, timing and uncertainty of cash flows arising from leases. This pronouncement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. Management is currently evaluating the impact of this pronouncement on Lexicon’s consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09, “Stock Compensation,” which is intended to simplify several aspects of the accounting for share-based payment award transactions. This pronouncement is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016, and early adoption is permitted. Management is currently evaluating the impact of this pronouncement on Lexicon’s consolidated financial statements.

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Cash and Cash Equivalents and Investments

6 Months Ended

Jun. 30, 2016

Cash and Cash Equivalents and Investments [Abstract]

Cash and Cash Equivalents Disclosure

Cash and Cash Equivalents and Investments

The fair value of cash and cash equivalents and investments held at June 30, 2016 and December 31, 2015 are as follows:

	As of June 30, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(in thousands)
Cash and cash equivalents	$	38,410	$	—	$	—		$	38,410
Securities maturing within one year:
U.S. treasury securities	379,307		333		—			379,640
Corporate debt securities	11,312		6		(3		)	11,315
Total short-term investments	$	390,619	$	339	$	(3	)	$	390,955
Total cash and cash equivalents and investments	$	429,029	$	339	$	(3	)	$	429,365
	As of December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
			(in thousands)
Cash and cash equivalents	$	202,989	$	—	$	—		$	202,989
Securities maturing within one year:
U.S. treasury securities	313,105		2		(219		)	312,888
Corporate debt securities	5,477		—		(2		)	5,475
Total short-term investments	$	318,582	$	2	$	(221	)	$	318,363
Total cash and cash equivalents and investments	$	521,571	$	2	$	(221	)	$	521,352

There were no realized gains or losses for the six months ended June 30, 2016, and no realized gains or losses for the six months ended June 30, 2015. The cost of securities sold is based on the specific identification method.

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Fair Value Measurements

6 Months Ended

Jun. 30, 2016

Fair Value Measurements [Abstract]

Fair Value, Measurement Inputs, Disclosure

Fair Value Measurements

The Company uses various inputs in determining the fair value of its investments and measures these assets on a recurring basis. Assets and liabilities recorded at fair value in the consolidated balance sheets are categorized by the level of objectivity associated with the inputs used to measure their fair value. The following levels are directly related to the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities:

• Level 1 - quoted prices in active markets for identical investments, which include U.S. treasury securities

• Level 2 - other significant observable inputs (including quoted prices for similar investments, market corroborated inputs, etc.), which includes corporate debt securities

• Level 3 - significant unobservable inputs (including the Company’s own assumptions in determining the fair value of the Symphony Icon purchase consideration liability)

The inputs or methodology used for valuing securities are not necessarily an indication of the credit risk associated with investing in those securities. The following table provides the fair value measurements of applicable Company assets and liabilities that are measured at fair value on a recurring basis according to the fair value levels described above as of June 30, 2016 and December 31, 2015.

	Assets and Liabilities at Fair Value as of June 30, 2016
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	38,410	$	—	$	—	$	38,410
Short-term investments	379,640		11,315		—		390,955
Total cash and cash equivalents and investments	$	418,050	$	11,315	$	—	$	429,365
Liabilities
Accrued liabilities	$	—	$	—	$	13,396	$	13,396
Other long-term liabilities	—		—		10,862		10,862
Total liabilities	$	—	$	—	$	24,258	$	24,258

	Assets and Liabilities at Fair Value as of December 31, 2015
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	200,526	$	2,463	$	—	$	202,989
Short-term investments	312,888		5,475		—		318,363
Total cash and cash equivalents and investments	$	513,414	$	7,938	$	—	$	521,352
Liabilities
Accrued liabilities	$	—	$	—	$	12,453	$	12,453
Other long-term liabilities	—		—		10,362		10,362
Total liabilities	$	—	$	—	$	22,815	$	22,815

The Company’s Level 3 liabilities, which consist of the Symphony Icon purchase consideration liability, is estimated using a probability-based income approach utilizing an appropriate discount rate. Subsequent changes in the fair value of the Symphony Icon purchase consideration liability are recorded as an increase or decrease in Symphony Icon purchase liability expense in the accompanying consolidated statements of comprehensive loss. The following table summarizes the change in consolidated balance sheet carrying value associated with Level 3 liabilities for the six months ended June 30, 2016 and 2015 (in thousands).

Balance at December 31, 2015	$	22,815
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	1,443
Balance at June 30, 2016	$	24,258
Balance at December 31, 2014	$	17,638
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	1,741
Payment of contingent payment obligation with cash	(750		)
Balance at June 30, 2015	$	18,629

The Company also has assets that under certain conditions are subject to measurement at fair value on a non-recurring basis. These assets include goodwill associated with the acquisitions of Coelacanth Corporation in 2001 and Symphony Icon in 2010 and intangible assets associated with the acquisition of Symphony Icon in 2010. For these assets, measurement at fair value in periods subsequent to their initial recognition is applicable if one or more is determined to be impaired.

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Buildings and Land Held for Sale

6 Months Ended

Jun. 30, 2016

Property, Plant and Equipment Impairment or Disposal [Abstract]

Disclosure of Long Lived Assets Held-for-sale

Buildings and Land Held and Used

In 2014, Lexicon reclassified its buildings and land in The Woodlands, Texas to assets held for sale on its consolidated balance sheet, as it intended to sell these assets. In 2015, Lexicon began negotiations with a commercial developer (the “Purchaser”) to enter into a sales agreement, which would include a leaseback component, requiring a change to Lexicon’s original plan of sale. This resulted in reclassification of its buildings and land to assets held and used in accordance with the accounting guidance regarding selling assets with a leaseback requirement.

In January 2016, Lexicon entered into a Real Estate Purchase and Sale Agreement (“Real Estate Agreement”) with the Purchaser. Under the Real Estate Agreement, Lexicon agreed to sell these assets to the Purchaser for a purchase price of $21.2 million, subject to the negotiation and execution by the parties of a leaseback agreement with respect to a portion of the property. In March 2016, the Purchaser terminated the Real Estate Agreement due to uncertainty in real estate and financing market conditions. Lexicon intends to explore other strategic alternatives with respect to its strategy to reduce facilities costs, including the potential sale of the facilities to an alternative third party. Due to the likelihood that any sale will require a leaseback of a portion of the property, the buildings and land remain classified as assets held and used as of June 30, 2016.

When events or changes in circumstances indicate the carrying amount of property and equity and intangible or other long-lived assets related to specifically acquired assets may not be recoverable, an evaluation of the recoverability of currently recorded costs is performed. When an evaluation is performed, the estimated value of undiscounted future net cash flows associated with the asset is compared to the assets carrying value to determine whether a write-down to fair value is required. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. The Company did not recognize any impairment of long-lived assets in the six months ended June 30, 2016 and 2015.

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Debt Obligations

6 Months Ended

Jun. 30, 2016

Debt Obligations [Abstract]

Debt Disclosure

Debt Obligations

Convertible Debt. In November 2014, Lexicon completed an offering of $87.5 million in aggregate principal amount of its 5.25% Convertible Senior Notes due 2021 (the “Notes”). The conversion feature did not meet the criteria for bifurcation as required by generally accepted accounting principles and the entire principal amount was recorded as long-term debt on the Company’s consolidated balance sheet.

The Notes are governed by an indenture (the “Indenture”), dated as of November 26, 2014, between the Company and Wells Fargo Bank, N.A., as trustee. The Notes bear interest at a rate of 5.25% per year, payable semiannually in arrears on June 1 and December 1 of each year, beginning on June 1, 2015. The Notes mature on December 1, 2021. The Company may not redeem the Notes prior to the maturity date, and no sinking fund is provided for the Notes.

Holders of the Notes may convert their Notes at their option at any time prior to the close of business on the business day immediately preceding the maturity date. Upon conversion, the Company will deliver for each $1,000 principal amount of converted Notes a number of shares of its common stock equal to the conversion rate, as described in the Indenture. The conversion rate is initially 118.4553 shares of common stock per $1,000 principal amount of Notes (equivalent to an initial conversion price of $8.442 per share of common stock). The conversion rate is subject to adjustment in some events but will not be adjusted for any accrued and unpaid interest. In addition, following certain corporate events that occur prior to the maturity date, the Company will increase the conversion rate for a holder who elects to convert its Notes in connection with such a corporate event in certain circumstances.

If the Company undergoes a fundamental change, holders may require the Company to repurchase for cash all or any portion of their Notes at a fundamental change repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

In connection with the issuance of the Notes, the Company incurred $3.4 million of debt issuance costs, which offsets long-term debt on the consolidated balance sheets. The debt issuance costs are amortized as interest expense over the expected life of the Notes using the effective interest method. The Company determined the expected life of the debt was equal to the seven-year term of the Notes. As of June 30, 2016, the balance of unamortized debt issuance costs was $2.6 million.

The fair value of the Notes was $159.8 million as of June 30, 2016 and was determined using Level 2 inputs based on the indicative pricing published by certain investment banks or trading levels of the Notes, which are not listed on any securities exchange or quoted on an inter-dealer automated quotation system.

Mortgage Loan.  In April 2004, Lexicon obtained a $34.0 million mortgage on its facilities in The Woodlands, Texas.  The mortgage loan originally had a ten-year term with a 20-year amortization and a fixed interest rate of 8.23%. The mortgage was amended in September 2013 to extend the maturity date from April 2014 to April 2017, with the mortgage loan’s monthly payment amount and fixed interest rate each remaining unchanged.  The mortgage had a principal balance outstanding of $17.3 million as of June 30, 2016. The entire principal balance is recorded as current portion of long-term debt in the accompanying consolidated balance sheet as of June 30, 2016 as there is a balloon payment due in April 2017. Lexicon intends to refinance this debt prior to paying the balloon payment. The buildings and land that serve as collateral for the mortgage loan are included in property and equipment at $59.2 million and $2.7 million, respectively, before accumulated depreciation, as of June 30, 2016. The fair value of Lexicon’s mortgage loan approximates its carrying value.  The fair value of Lexicon’s mortgage loan was determined using Level 2 inputs using discounted cash flow analysis, based on the Company’s estimated current incremental borrowing rate.

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Arrangements with Symphony Icon Inc

6 Months Ended

Jun. 30, 2016

Arrangements with Symphony Icon Inc [Abstract]

Arrangements with Symphony Icon Inc

Arrangements with Symphony Icon, Inc.

On June 15, 2007, Lexicon entered into a series of related agreements providing for the financing of the clinical development of certain of its drug candidates, including telotristat etiprate (LX1032) and LX1033, along with any other pharmaceutical compositions modulating the same targets as those drug candidates (the “Programs”). The agreements included a Novated and Restated Technology License Agreement pursuant to which the Company licensed to Symphony Icon, a then wholly-owned subsidiary of Symphony Icon Holdings LLC (“Holdings”), the Company's intellectual property rights related to the Programs. Holdings contributed $45 million to Symphony Icon in order to fund the clinical development of the Programs.

Under a Share Purchase Agreement, dated June 15, 2007, between the Company and Holdings, the Company issued and sold to Holdings 1,092,946 shares of its common stock on June 15, 2007 in exchange for $15 million and an exclusive purchase option (the “Purchase Option”) that gave the Company the right to acquire all of the equity of Symphony Icon, thereby allowing the Company to reacquire all of the Programs. On July 30, 2010, Lexicon entered into an Amended and Restated Purchase Option Agreement with Symphony Icon and Holdings and simultaneously exercised the Purchase Option, thereby reacquiring the Programs. Pursuant to the amended terms of the Purchase Option, Lexicon paid Holdings $10 million on July 30, 2010 and issued 1,891,074 shares of common stock to designees of Holdings on July 30, 2012 in satisfaction of an additional $35 million base payment obligation.

Lexicon also agreed to make up to $45 million in additional contingent payments, which will consist of 50% of any consideration Lexicon receives pursuant to any licensing transaction (a “Licensing Transaction”) under which Lexicon grants a third party rights to commercialize telotristat etiprate, LX1033 or other pharmaceutical compositions modulating the same target as those drug candidates (the “LG103 Programs”), subject to certain exceptions. The contingent payments will be due if and when Lexicon receives such consideration from a Licensing Transaction. In the event Lexicon receives regulatory approval in the United States for the marketing and sale of any product resulting from the LG103 Programs prior to entering into a Licensing Transaction for the commercialization of such product in the United States, in lieu of any contingent payment from such a Licensing Transaction, Lexicon will pay Holdings the sum of $15 million and the amount of certain expenses Lexicon incurred after its exercise of the Purchase Option which are attributable to the development of such product, reduced by up to 50% of such sum on account of any contingent payments paid prior to such United States regulatory approval attributable to any such Licensing Transaction outside of the United States with respect to such product. In the event Lexicon makes any such payment upon United States regulatory approval, Lexicon will have no obligation to make subsequent contingent payments attributable to any such Licensing Transactions for the commercialization of such product outside the United States until the proceeds of such Licensing Transactions exceed 50% of the payment made as a result of such United States regulatory approval. The contingent payments may be paid in cash or a combination of cash and common stock, in Lexicon’s discretion, provided that no more than 50% of any contingent payment will be paid in common stock. On December 4, 2014, Lexicon paid $5.8 million in cash and issued 666,111 shares of common stock to designees of Holdings in satisfaction of a $11.5 million contingent payment obligation as a result of receiving an upfront payment pursuant to Lexicon’s license and collaboration agreement with Ipsen Pharma SAS. On April 24, 2015, Lexicon paid $0.75 million in cash to Holdings in satisfaction of its contingent payment obligation as a result of receiving an additional upfront payment from Ipsen in March 2015 (see Note 11, Collaboration and License Agreements).

Lexicon accounted for the exercise of the Purchase Option and acquisition of Symphony Icon as a business combination. In connection with its acquisition of Symphony Icon, Lexicon paid $10.0 million in cash, and has also agreed to pay Holdings additional base and contingent payments as discussed above. The fair value of the base and contingent consideration payments was $45.6 million and was estimated by applying a probability-based income approach utilizing an appropriate discount rate. This estimation was based on significant inputs that are not observable in the market, referred to as Level 3 inputs. Key assumptions include: (1) a discount rate of 14% for the base payments; (2) a discount rate of 18% for the contingent payments; and (3) a probability adjusted contingency. The discount rate assumptions have not changed through June 30, 2016, and as programs progress, the probability adjusted contingency is adjusted as necessary. Subsequent changes in the fair value of the Symphony Icon purchase consideration liability are recorded as increase or decrease in fair value of Symphony Icon purchase liability expense in the accompanying consolidated statements of comprehensive loss. During the six months ended June 30, 2016 and 2015, the fair value of the Symphony Icon purchase consideration liability increased by $1.4 million and $1.7 million, respectively.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2016

Commitments and Contingencies [Abstract]

Commitments and Contingencies Disclosure

Commitments and Contingencies

Operating Lease Obligations:  A Lexicon subsidiary leases office space in Basking Ridge, New Jersey under an operating lease agreement, the term of which began in June 2015 and terminates in December 2022. Rent expense is recognized on a straight-line basis over the lease term.  Lexicon is the guarantor of the obligations of its subsidiary under this lease agreement.  The maximum potential amount of future payments the Company could be required to make under this agreement is $4.0 million as of June 30, 2016. Additionally, Lexicon leases certain equipment under operating leases.

Legal Proceedings.  Lexicon is from time to time party to claims and legal proceedings that arise in the normal course of its business and that it believes will not have, individually or in the aggregate, a material adverse effect on its results of operations, financial condition or liquidity.

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Collaboration and License Agreements

6 Months Ended

Jun. 30, 2016

Collaboration and License Agreements [Abstract]

Collaborative Arrangement Disclosure

Collaboration and License Agreements

Lexicon has derived substantially all of its revenues from drug discovery and development collaborations, target validation collaborations for the development and, in some cases, analysis of the physiological effects of genes altered in knockout mice, government grants and contracts, technology licenses, subscriptions to its databases and compound library sales.

Sanofi. In November 2015, Lexicon entered into a Collaboration and License Agreement (the “Sanofi Agreement”) with Sanofi for the worldwide development of Lexicon’s diabetes drug candidate sotagliflozin (LX4211).

Under the Sanofi Agreement, Lexicon granted Sanofi an exclusive, worldwide, royalty-bearing right and license under its patent rights and know-how to develop, manufacture and commercialize sotagliflozin. Subject to specified exceptions, neither party may (a) perform clinical development activities relating to any other compound which inhibits sodium-glucose cotransporters type 1 or type 2 or (b) commercialize any such compounds in the United States, countries of the European Union and certain other specified countries, in each case during the royalty terms applicable in such countries. Among the specified exceptions is a right Lexicon retained to pursue the development of its LX2761 drug candidate, with respect to which Lexicon granted Sanofi certain rights of first negotiation specified in the Sanofi Agreement.

Under the Sanofi Agreement, Sanofi paid Lexicon an upfront payment of $300 million. In addition, Lexicon is eligible to receive from Sanofi (a) up to an aggregate of $430 million upon the achievement of specified development and regulatory milestones and (b) up to an aggregate of $990 million upon the achievement of specified sales milestones. Due to the uncertainty surrounding the achievement of the future development, regulatory and sales milestones, these payments will not be recognized as revenue unless and until they are earned as the Company is not able to reasonably predict if and when the milestones will be achieved. Lexicon is also entitled to tiered, escalating royalties ranging from low double digit percentages to forty percent of net sales of sotagliflozin, based on indication and territory, with royalties for the higher band of such range attributable to net sales for type 1 diabetes in the United States, and subject in each case to customary royalty reduction provisions. Royalties payable with respect to net sales of sotagliflozin for type 1 diabetes in the United States will also be reduced in the event Lexicon does not exercise its co-promotion option described below.

Lexicon will continue to be responsible for all clinical development activities relating to type 1 diabetes and will retain an exclusive option to co-promote and have a significant role, in collaboration with Sanofi, in the commercialization of sotagliflozin for the treatment of type 1 diabetes in the United States. If Lexicon exercises its co-promotion option, Lexicon will fund forty percent of the commercialization costs relating to such co-promotion activities. Sanofi will be responsible for all clinical development and commercialization of sotagliflozin for the treatment of type 2 diabetes worldwide and will be solely responsible for the commercialization of sotagliflozin for the treatment of type 1 diabetes outside the United States. Lexicon will share in the funding of a portion of the planned type 2 diabetes development costs over the next three years, up to an aggregate of $100 million. Sanofi will book sales worldwide in all indications.

The parties are responsible for using commercially reasonable efforts to perform their development and commercialization obligations pursuant to mutually approved development and commercialization plans.

The parties’ activities under the Sanofi Agreement are governed by a joint steering committee and certain other governance committees which reflect equal or other appropriate representation from both parties. If the applicable governance committee is not able to make a decision by consensus and the parties are not able to resolve the issue through escalation to specified senior executive officers of the parties, then Sanofi will have final decision-making authority, subject to limitations specified in the Sanofi Agreement.

The Sanofi Agreement will expire upon the expiration of all applicable royalty terms for all licensed products in all countries. The royalty term for each licensed product in each country is the period commencing on the effective date of the Sanofi Agreement and ending on the latest of expiration of specified patent coverage, expiration of specified regulatory exclusivity and 10 years following the first commercial sale in the applicable country. Either party may terminate the Sanofi Agreement in the event of an uncured material breach by the other party. Prior to completion of the core development activities for type 2 diabetes specified in the development plan, Sanofi may terminate the Sanofi Agreement on a country-by-country and licensed product-by-licensed product basis, in the event of (a) notification of a material safety issue relating to the licensed product or the class of sodium-glucose cotransporters type 1 or type 2 inhibitors resulting in a recommendation or requirement that Lexicon or Sanofi cease development, (b) failure to achieve positive results with respect to certain clinical trial results, (c) the occurrence of specified fundamental adverse events or (d) the exploitation of the licensed product infringing third party intellectual property rights in specified major markets and Sanofi is unable to obtain a license to such third party intellectual property rights.

The Company considered the following deliverables with respect to the revenue recognition of the $300 million upfront payment:

• The exclusive worldwide license granted to Sanofi to develop and commercialize sotagliflozin;

• The development services Lexicon is performing for sotagliflozin relating to type 1 diabetes; and

• The funding Lexicon will provide for development relating to type 2 diabetes.

The Company determined that the license had stand-alone value because it is an exclusive license that gives Sanofi the right to develop and commercialize sotagliflozin or to sublicense its rights. In addition, sotagliflozin is currently in development and it is possible that Sanofi or another third party could conduct clinical trials without assistance from Lexicon. As a result, the Company considers the license and the development services under the Sanofi Agreement to be separate units of accounting. The Company recognized the portion of the consideration allocated to the license immediately because Lexicon delivered the license and earned the revenue at the inception of the arrangement. The Company is recognizing as revenue the amount allocated to the development services for type 1 diabetes and the obligation to provide funding for development services for type 2 diabetes over the period of time Lexicon performs services or provides funding, currently expected to be through 2020.

The Company determined that the initial allocable arrangement consideration was the $300 million upfront payment because it was the only payment that was fixed and determinable at the inception of the arrangement. There was considerable uncertainty at the date of the agreement as to whether Lexicon would earn milestone payments or royalty payments. As such, the Company did not include those payments in the allocable consideration. The Company allocated the allocable consideration based on the relative best estimate of selling price of each unit of accounting. The Company estimated the selling price of the license deliverable by applying a probability-based income approach utilizing an appropriate discount rate. The significant inputs the Company used to determine the projected income of the license included: exercising the option to copromote, estimated future product sales, estimated cost of goods sold, estimated operating expenses, income taxes, and an appropriate discount rate. The Company estimated the selling price of the development services for type 1 diabetes by using internal estimates of the cost to hire third parties to perform the services over the expected period to perform the development. The Company estimated the obligation to provide funding for type 2 diabetes by using internal estimates of the expected cash flows and timing for $100 million in funding.

As a result of the allocation, the Company recognized $126.8 million of the $300 million upfront payment for the license in 2015. The Company is recognizing the $113.8 million allocated to the development services deliverable and the $59.4 million allocated to the funding deliverable over the estimated period of performance as the development and funding occurs. Revenue recognized under the Sanofi Agreement was $31.7 million for the six months ended June 30, 2016.

Ipsen Pharma SAS. In October 2014, Lexicon entered into a License and Collaboration Agreement, which was subsequently amended in March 2015 (collectively, the “Ipsen Agreement”), with Ipsen Pharma SAS (“Ipsen”) for the development and commercialization of Lexicon’s drug candidate telotristat etiprate (LX1032) outside of the United States and Japan (the “Licensed Territory”).

Under the Ipsen Agreement, Lexicon granted Ipsen an exclusive, royalty-bearing right and license under its patent rights and know-how to commercialize telotristat etiprate in the Licensed Territory. Ipsen is responsible for using diligent efforts to commercialize telotristat etiprate in the Licensed Territory pursuant to a mutually approved commercialization plan. Subject to certain exceptions, Lexicon will be responsible for conducting clinical trials required to obtain regulatory approval for telotristat etiprate for carcinoid syndrome in the European Union, including those contemplated by a mutually approved initial development plan, and will have the first right to conduct most other clinical trials of telotristat etiprate. Lexicon is responsible for the costs of all clinical trials contemplated by the initial development plan. The costs of additional clinical trials will be allocated between the parties based on the nature of such clinical trials. Under the Ipsen Agreement, Ipsen has paid Lexicon an aggregate of $24.5 million through June 30, 2016. In addition, Lexicon is eligible to receive from Ipsen (a) up to an aggregate of approximately $34 million upon the achievement of specified regulatory and commercial launch milestones and (b) up to an aggregate of €72 million upon the achievement of specified sales milestones. Due to the uncertainty surrounding the achievement of the future regulatory and sales milestones, these payments will not be recognized as revenue unless and until they are earned as the Company is not able to reasonably predict if and when the milestones will be achieved. Lexicon is also entitled to tiered, escalating royalties ranging from low twenties to mid-thirties percentages of net sales of telotristat etiprate in the Licensed Territory, subject to a credit for amounts previously paid to Lexicon by Ipsen for the manufacture and supply of such units of telotristat etiprate. Lexicon’s receipt of these payments under the Ipsen Agreement triggers its obligation to make certain contingent payments to Holdings (see Note 9, Arrangements with Symphony Icon, Inc.). Lexicon and Ipsen have entered into a commercial supply agreement pursuant to which Lexicon will supply Ipsen’s commercial requirements of telotristat etiprate, and Ipsen will pay an agreed upon transfer price for such commercial supply.

The Company considered the following deliverables with respect to the revenue recognition of the $24.5 million upfront payments:

• The exclusive license granted to Ipsen to develop and commercialize telotristat etiprate in the Licensed Territory;

•The development services Lexicon is performing for telotristat etiprate;

• The obligation to participate in committees which govern the development of telotristat etiprate until commercialization; and

•The obligation to supply commercial supply of telotristat etiprate, under a commercial supply agreement.

The Company determined that the license had stand-alone value because it is an exclusive license that gives Ipsen the right to develop and commercialize telotristat etiprate or to sublicense its rights. In addition, telotristat etiprate is currently in development and it is possible that Ipsen or another third party could conduct clinical trials without assistance from Lexicon. As a result, the Company considers the license and the development services under the Ipsen Agreement to be separate units of accounting. The Company recognized the portion of the consideration allocated to the license immediately because Lexicon delivered the license and earned the revenue at the inception of the arrangement. The Company is recognizing as revenue the amount allocated to the development services and the obligation to participate in committees over the period of time Lexicon performs services, currently expected to be through mid-2017.

Due to the inherent uncertainty in obtaining regulatory approval, the applicability of the commercial supply agreement is outside the control of Lexicon and Ipsen. Accordingly, the Company has determined the commercial supply agreement is a contingent deliverable at the onset of the Ipsen Agreement. As a result, the Company has determined the commercial supply agreement does not meet the definition of a deliverable that needs to be accounted for at the inception of the arrangement. The Company has also determined that there is no significant and incremental discount related to the commercial supply agreement that should be accounted for at the inception of the arrangement.

The Company determined that the initial allocable arrangement consideration was the $24.5 million upfront payments because they were the only payments that were fixed and determinable at the inception of the arrangement. There was considerable uncertainty at the date of the agreement as to whether Lexicon would earn milestone payments, royalty payments or payments for finished drug product. As such, the Company did not include those payments in the allocable consideration. The Company allocated the allocable consideration based on the relative best estimate of selling price of each unit of accounting. The Company estimated the selling price of the license deliverable by applying a probability-based income approach utilizing an appropriate discount rate. The significant inputs the Company used to determine the projected income of the license included: estimated future product sales, estimated cost of goods sold, estimated operating expenses, income taxes, and an appropriate discount rate. The Company estimated the selling price of the development services by using internal estimates of the cost to hire third parties to perform the services over the expected period to perform the development. The Company estimated the selling price of the obligation to participate in committees by using internal estimates of the number of internal hours and salary and benefits costs to perform these services.

As a result of the allocation, the Company recognized $21.2 million of the $24.5 million upfront payments for the license in 2014, and an additional $1.4 million in 2015 upon entering into the amendment. The Company is recognizing the $1.7 million allocated to the development services deliverable over the estimated period of performance as development occurs, and is recognizing the $0.1 million allocated to the committee participation deliverable ratably over the estimated period of performance. Revenue recognized under the Ipsen Agreement was $0.2 million and $2.0 million for the six months ended June 30, 2016 and 2015, respectively.

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Net Loss Per Share Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2016

Net Loss Per Share [Abstract]

Earnings Per Share, Policy

Net loss per share is computed using the weighted average number of shares of common stock outstanding during the applicable period and excludes shares underlying convertible debt, stock options and restricted stock units because they are antidilutive.

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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

Stock-Based Compensation [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Expected Volatility		Risk-free Interest Rate		Expected Term	Dividend Rate
June 30, 2016:
Employees	63	%	1.1	%	4	—	%
Officers and non-employee directors	83	%	1.6	%	8	—	%
June 30, 2015:
Employees	63	%	1.2	%	4	—	%
Officers and non-employee directors	81	%	1.8	%	8	—	%

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Options		Weighted Average Exercise Price
	(in thousands)
Outstanding at December 31, 2015	4,217		$	12.35
Granted	1,130		9.23
Exercised	(66	)	9.98
Expired	(166	)	27.36
Forfeited	(12	)	8.65
Outstanding at June 30, 2016	5,103		11.21
Exercisable at June 30, 2016	2,911		$	12.94

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

	Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Outstanding at December 31, 2015	637		$	8.74
Granted	496		8.20
Vested	(206	)	9.75
Forfeited	(33	)	10.95
Nonvested at June 30, 2016	894		$	8.12

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Cash and Cash Equivalents and Investments (Tables)

6 Months Ended

Jun. 30, 2016

Cash and Cash Equivalents and Investments [Abstract]

Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block]

	As of June 30, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(in thousands)
Cash and cash equivalents	$	38,410	$	—	$	—		$	38,410
Securities maturing within one year:
U.S. treasury securities	379,307		333		—			379,640
Corporate debt securities	11,312		6		(3		)	11,315
Total short-term investments	$	390,619	$	339	$	(3	)	$	390,955
Total cash and cash equivalents and investments	$	429,029	$	339	$	(3	)	$	429,365
	As of December 31, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
			(in thousands)
Cash and cash equivalents	$	202,989	$	—	$	—		$	202,989
Securities maturing within one year:
U.S. treasury securities	313,105		2		(219		)	312,888
Corporate debt securities	5,477		—		(2		)	5,475
Total short-term investments	$	318,582	$	2	$	(221	)	$	318,363
Total cash and cash equivalents and investments	$	521,571	$	2	$	(221	)	$	521,352

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Measurements [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

	Assets and Liabilities at Fair Value as of June 30, 2016
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	38,410	$	—	$	—	$	38,410
Short-term investments	379,640		11,315		—		390,955
Total cash and cash equivalents and investments	$	418,050	$	11,315	$	—	$	429,365
Liabilities
Accrued liabilities	$	—	$	—	$	13,396	$	13,396
Other long-term liabilities	—		—		10,862		10,862
Total liabilities	$	—	$	—	$	24,258	$	24,258

	Assets and Liabilities at Fair Value as of December 31, 2015
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	200,526	$	2,463	$	—	$	202,989
Short-term investments	312,888		5,475		—		318,363
Total cash and cash equivalents and investments	$	513,414	$	7,938	$	—	$	521,352
Liabilities
Accrued liabilities	$	—	$	—	$	12,453	$	12,453
Other long-term liabilities	—		—		10,362		10,362
Total liabilities	$	—	$	—	$	22,815	$	22,815

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Balance at December 31, 2015	$	22,815
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	1,443
Balance at June 30, 2016	$	24,258
Balance at December 31, 2014	$	17,638
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	1,741
Payment of contingent payment obligation with cash	(750		)
Balance at June 30, 2015	$	18,629

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Stock-Based Compensation (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	$ 2.0	$ 1.8	$ 3.8	$ 3.7

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Stock-Based Compensation (Details 2) - Stock Option [Member]	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Volatility Rate, Employees	63.00%	63.00%
Expected Volatility Rate, Officers and Non-employee Directors	83.00%	81.00%
Risk Free Interest Rate, Employees	1.10%	1.20%
Risk Free Interest Rate, Officers and Non-employee Directors	1.60%	1.80%
Expected Term, Employees	4 years	4 years
Expected Term, Officers and Non-employee Directors	8 years	8 years
Expected Dividend Rate, Employees	0.00%	0.00%
Expected Dividend Rate, Officers and Non-employee Directors	0.00%	0.00%

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Stock-Based Compensation (Details 3) - Stock Options [Member] - $ / shares shares in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding	5,103	4,217
Stock Options Outstanding, Weighted Average Exercise Price	$ 11.21	$ 12.35
Stock Options Granted	1,130
Stock Options Granted, Weighted Average Exercise Price	$ 9.23
Stock Options Exercised	(66)
Stock Options Exercised, Weighted Average Exercise Price	$ 9.98
Stock Options Expired	(166)
Stock Options Expired, Weighted Average Exercise Price	$ 27.36
Stock Options Forfeited	(12)
Stock Options Forfeited, Weighted Average Exercise Price	$ 8.65
Stock Options Exercisable	2,911
Stock Options Exercisable, Weighted Average Exercise Price	$ 12.94

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Stock-Based Compensation (Details 4) - Restricted Stock Units [Member] - $ / shares shares in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units Outstanding	894	637
Restricted Stock Units Outstanding, Weighted Average Grant Date Fair Value	$ 8.12	$ 8.74
Restricted Stock Units Granted	496
Restricted Stock Units Granted, Weighted Average Grant Date Fair Value	$ 8.20
Restricted Stock Units Vested	(206)
Restricted Stock Units Vested, Weighted Average Grant Date Fair Value	$ 9.75
Restricted Stock Units Forfeited	(33)
Restricted Stock Units Forfeited, Weighted Average Grant Date Fair Value	$ 10.95

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Stock-Based Compensation (Details 5)	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award Stock Bonus and Restricted Stock Grants in Period Shares | shares	11,456
Share Based Compensation Arrangement By Share Based Payment Award Stock Bonus and Restricted Stock Grants in Period Weighted Average Grant Date Fair Value | $ / shares	$ 13.96

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Recent Accounting Pronouncements (Details)	Dec. 31, 2015 USD ($)
Recent Accounting Pronouncements [Abstract]
Reclassification of Debt Issuance Costs Impact to Other Assets	$ 2,900,000
Reclassification of Debt Issuance Costs Impact to Current Portion of Long-term Debt	39,000
Reclassification of Debt Issuance Costs Impact to Long-term Debt	$ 2,800,000

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Cash and Cash Equivalents and Investments (Details 1) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Cash and Cash Equivalents
Fair Value
Amortized Cost	$ 38,410	$ 202,989
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	38,410	202,989
U.S. Treasury Securities
Fair Value
Amortized Cost	379,307	313,105
Gross Unrealized Gains	333	2
Gross Unrealized Losses	0	(219)
Estimated Fair Value	379,640	312,888
Corporate Debt Securities
Fair Value
Amortized Cost	11,312	5,477
Gross Unrealized Gains	6	0
Gross Unrealized Losses	(3)	(2)
Estimated Fair Value	11,315	5,475
Total Short-term Investments
Fair Value
Amortized Cost	390,619	318,582
Gross Unrealized Gains	339	2
Gross Unrealized Losses	(3)	(221)
Estimated Fair Value	390,955	318,363
Total Cash and Cash Equivalents and Investments
Fair Value
Amortized Cost	429,029	521,571
Gross Unrealized Gains	339	2
Gross Unrealized Losses	(3)	(221)
Estimated Fair Value	$ 429,365	$ 521,352

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Cash and Cash Equivalents and Investments (Details 2) - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Schedule of Investments [Line Items]
Realized Investment Gains (Losses)	$ 0	$ 0

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Fair Value Measurements (Details 1) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Level 1
Fair Value
Cash and Cash Equivalents	$ 38,410	$ 200,526
Short-term Investments	379,640	312,888
Total Cash and Cash Equivalents and Investments	418,050	513,414
Accrued Liabilities	0	0
Other Long-term Liabilities	0	0
Total Liabilities	0	0
Fair Value, Level 2
Fair Value
Cash and Cash Equivalents	0	2,463
Short-term Investments	11,315	5,475
Total Cash and Cash Equivalents and Investments	11,315	7,938
Accrued Liabilities	0	0
Other Long-term Liabilities	0	0
Total Liabilities	0	0
Fair Value, Level 3
Fair Value
Cash and Cash Equivalents	0	0
Short-term Investments	0	0
Total Cash and Cash Equivalents and Investments	0	0
Accrued Liabilities	13,396	12,453
Other Long-term Liabilities	10,862	10,362
Total Liabilities	24,258	22,815
Fair Value, Total
Fair Value
Cash and Cash Equivalents	38,410	202,989
Short-term Investments	390,955	318,363
Total Cash and Cash Equivalents and Investments	429,365	521,352
Accrued Liabilities	13,396	12,453
Other Long-term Liabilities	10,862	10,362
Total Liabilities	$ 24,258	$ 22,815

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Fair Value Measurements (Details 2) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	$ 1,443	$ 1,741
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	$ 24,258	18,629	$ 22,815	$ 17,638
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements		$ (750)

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Fair Value Measurements (Details 3) $ in Millions	Jul. 30, 2012 USD ($) shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Symphony Base Payment in Shares | shares	1,891,074
Symphony Base Payment Obligation | $	$ 35

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Buildings and Land Held for Sale (Details) $ in Millions	1 Months Ended
	Jan. 31, 2016 USD ($)
Property, Plant and Equipment Impairment or Disposal [Abstract]
Real Estate Selling Price	$ 21.2

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Debt Obligations (Details) $ / shares in Units, $ in Millions	1 Months Ended
	Nov. 30, 2014 USD ($)	Apr. 30, 2004 USD ($)	Jun. 30, 2016 USD ($) $ / shares
Debt Instrument [Line Items]
Proceeds from Convertible Debt	$ 87.5
Convertible Debt Instrument Interest Rate Stated Percentage			5.25%
Debt Instrument, Convertible, Conversion Ratio	118.4553
Debt Instrument, Convertible, Conversion Price | $ / shares			$ 8.442
Debt Issuance Cost	$ 3.4
Unamortized Debt Issuance Expense			$ 2.6
Debt Instrument, Fair Value Disclosure			159.8
Buildings Collateral			59.2
Land Collateral			$ 2.7
Mortgage Loans on Real Estate, New Mortgage Loans		$ 34.0
Debt Instrument, Interest Rate, Stated Percentage			8.23%
Mortgage Loans on Real Estate, Carrying Amount of Mortgages			$ 17.3

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Arrangements with Symphony Icon Inc (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Apr. 24, 2015	Dec. 04, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jul. 30, 2012	Jul. 30, 2010	Jun. 15, 2007
Loss Contingencies [Line Items]
Holdings Contribution to Icon									$ 45,000
Lexicon Sold Shares to Holdings									1,092,946
Lexicon Received Cash from Holdings									$ 15,000
Lexicon Paid Holdings Cash								$ 10,000
Symphony Base Payment in Shares							1,891,074
Symphony Base Payment Obligation							$ 35,000
Symphony Contingent Payment Maximum								$ 45,000
Symphony Contingent Payment Percentage								50.00%
Symphony Regulatory Approval Payment								$ 15,000
Symphony Regulatory Approval Reduction Percentage								50.00%
Symphony Regulatory Approval Percentage Limit								50.00%
Symphony Payment in Stock Limitation								50.00%
Symphony Contingent Payment In Cash	$ 750	$ 5,800
Symphony Contingent Payment in Shares		666,111
Symphony Contingent Payment Total		$ 11,500
Symphony Fair Value of Base and Contingent Payments								$ 45,600
Symphony Base Payment Discount Rate								14.00%
Symphony Contingent Payment Discount Rate								18.00%
Increase (decrease) in fair value of Symphony Icon, Inc. purchase liability			$ 478	$ (12)	$ 1,443	$ 1,741

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Commitments and Contingencies (Details) $ in Millions	Jun. 30, 2016 USD ($)
Operating Leased Assets [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 4.0

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Collaboration and License Agreements (Details) € in Millions, $ in Millions	1 Months Ended				6 Months Ended		12 Months Ended
	Nov. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Oct. 31, 2014 USD ($)	Oct. 31, 2014 EUR (€)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Collaboration and License Agreements [Abstract]
Sanofi Upfront Payment	$ 300.0
Sanofi Development and Regulatory Milestone Payments	430.0
Sanofi Sales Milestone Payments	990.0
Sanofi Commercialization Costs Funded by Lexicon Maximum Amount	100.0
Sanofi Revenue Allocated to License Deliverable	126.8
Sanofi Revenue Allocated to Development Deliverable	113.8
Sanofi Revenue Allocated to Funding Deliverable	$ 59.4
Sanofi Revenue Recognized					$ 31.7
Ipsen Maximum Regulatory And Commercial Milestones			$ 34.0
Ipsen Maximum Sales Milestones | €				€ 72
Ipsen Total Upfront Payments		$ 24.5
Ipsen Revenue Allocated to License Deliverable						$ 1.4	$ 21.2
Ipsen Revenue Allocated to Development Deliverable			1.7
Ipsen Revenue Allocated to Committee Deliverable			$ 0.1
Ipsen Revenue Recognized					$ 0.2	$ 2.0