10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

(Mark One)

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

For the quarterly period ended March 31, 2019

OR

☐ 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: 000-51173

Catalyst Biosciences, Inc.

(Exact Name of Registrant as Specified in its Charter)

Delaware	56-2020050
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)

611 Gateway Blvd., Suite 710 South San Francisco, California	94080
(Address of Principal Executive Offices)	(Zip Code)

(650) 871-0761

(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  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    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, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act (Check one):

Large accelerated filer	☐	Accelerated filer	☒
Non-accelerated filer	☐	Smaller reporting company	☒
Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

As of April 30, 2019, the number of outstanding shares of the registrant’s common stock, par value $0.001 per share, was 11,980,103.

Securities registered or to be registered pursuant to Section 12(b) of theAct.

Title ofeachclass	Trading Symbol(s)	Name ofeachexchangeon whichregistered
Common Stock	CBIO	NASDAQ

CATALYST BIOSCIENCES, INC.

TABLE OF CONTENTS

		Page No.
PART I. FINANCIAL INFORMATION		3
Item 1.	Financial Statements:	3
	Condensed Consolidated Balance Sheets as of March 31, 2019 (unaudited) and December 31, 2018	3
	Condensed Consolidated Statements of Operations for the three months ended March 31, 2019 and 2018 (unaudited)	4
	Condensed Consolidated Statements of Comprehensive Loss for the three months ended March 31, 2019 and 2018 (unaudited)	5
	Condensed Consolidated Statements of Stockholders’ Equity for the three months ended March 31, 2019 and 2018 (unaudited)	6
	Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2019 and 2018 (unaudited)	7
	Notes to the Unaudited Interim Condensed Consolidated Financial Statements	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	14
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	21
Item 4.	Controls and Procedures	21
PART II. OTHER INFORMATION		22
Item 1.	Legal Proceedings	22
Item 1A.	Risk Factors	22
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	22
Item 3.	Defaults Upon Senior Securities	22
Item 4.	Mine Safety Disclosures	22
Item 5.	Other Information	22
Item 6.	Exhibits	22
Exhibit Index		23
Signatures		24

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

Catalyst Biosciences, Inc.

Condensed Consolidated Balance Sheets

(In thousands, except share and per share amounts)

	March 31, 2019			December 31, 2018
	(Unaudited)
Assets
Current assets:
Cash and cash equivalents	$	25,024		$	31,213
Short-term investments		80,253			88,914
Restricted cash		50			50
Prepaid and other current assets		3,675			3,814
Total current assets		109,002			123,991
Other assets, noncurrent		197			543
Right-of-use assets		2,315			—
Property and equipment, net		356			386
Total assets	$	111,870		$	124,920
Liabilities and stockholders’ equity
Current liabilities:
Accounts payable	$	282		$	1,248
Accrued compensation		876			1,495
Other accrued liabilities		2,762			2,043
Deferred rent, current portion		—			15
Operating lease liability		450			—
Total current liabilities		4,370			4,801
Operating lease liability, noncurrent		1,686		—
Deferred rent, noncurrent portion		—			174
Total liabilities		6,056			4,975
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized; zero shares issued    and outstanding		—		—
Common stock, $0.001 par value, 100,000,000 shares authorized; 11,974,104 and    11,954,528 shares issued and outstanding at March 31, 2019 and December 31, 2018,    respectively		12			12
Additional paid-in capital		324,214			323,279
Accumulated other comprehensive income (loss)		13			(4	)
Accumulated deficit		(218,425	)		(203,342	)
Total stockholders’ equity		105,814			119,945
Total liabilities and stockholders’ equity	$	111,870		$	124,920

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

3

Catalyst Biosciences, Inc.

Condensed Consolidated Statements of Operations

(In thousands, except share and per share amounts)

(Unaudited)

	Three Months Ended March 31,
	2019			2018
Contract revenue	$	—		$	6
Operating expenses:
Research and development		12,027			3,771
General and administrative		3,687			2,914
Total operating expenses		15,714			6,685
Loss from operations		(15,714	)		(6,679	)
Interest and other income, net		631			1,637
Net loss	$	(15,083	)	$	(5,042	)
Net loss per share attributable to common stockholders, basic and diluted	$	(1.26	)	$	(0.56	)
Shares used to compute net loss per share attributable to common stockholders, basic and    diluted		11,963,586			8,989,669

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

4

Catalyst Biosciences, Inc.

Condensed Consolidated Statements of Comprehensive Loss

(In thousands)

(Unaudited)

	Three Months Ended March 31,
	2019			2018
Net loss	$	(15,083	)	$	(5,042	)
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale securities		17			(4	)
Total comprehensive loss	$	(15,066	)	$	(5,046	)

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

5

Catalyst Biosciences, Inc.

Condensed Consolidated Statement of Stockholders’ Equity

(In thousands, except share amounts)

(Unaudited)

	Convertible Preferred Stock					Common Stock				Additional Paid-In		Accumulated Other Comprehensive			Accumulated			Total Stockholders’ Equity
	Shares			Amount		Shares		Amount		Capital		Income (Loss)			Deficit			(Deficit)
Balance at December 31, 2018		—		$	—		11,954,528	$	12	$	323,279	$	(4	)	$	(203,342	)	$	119,945
Stock-based compensation expense		—			—		—		—		829		—			—			829
Issuance of common stock from stock    grants and option exercises		—			—		19,576		—		106		—			—			106
Unrealized gain on available-for-sale    securities		—			—		—		—		—		17			—			17
Net loss		—			—		—		—		—		—			(15,083	)		(15,083	)
Balance at March 31, 2019		—		$	—		11,974,104	$	12	$	324,214	$	13		$	(218,425	)	$	105,814
	Convertible Preferred Stock					Common Stock				Additional Paid-In		Accumulated Other Comprehensive			Accumulated			Total Stockholders’ Equity
	Shares			Amount		Shares		Amount		Capital		Income (Loss)			Deficit			(Deficit)
Balance at December 31, 2017		3,680		$	—		6,081,230	$	6	$	204,262	$	—		$	(173,494	)	$	30,774
Opening balance adjustment - adoption    of ASC 606		—			—		—		—		—		—			207			207
Balance at January 1, 2018		3,680		$	—		6,081,230	$	6	$	204,262	$	—		$	(173,287	)		30,981
Stock-based compensation expense		—			—		—		—		606		—			—			606
Issuance of common stock for secondary    public offering, net of issuance costs		—			—		3,382,352		4		106,758		—			—			106,762
Issuance of common stock upon    exercise of warrants		—			—		1,735,419		2		9,543		—			—			9,545
Conversion of preferred stock to    common stock		(3,680	)		—		736,000		—		—		—			—			—
Issuance of common stock from stock    grants and option exercises		—			—		59		—		—		—			—			—
Conversion of redeemable convertible    notes to common stock		—			—		21		—		3		—			—			3
Unrealized gain on available-for-sale    securities		—			—		—		—		—		(4	)		—			(4	)
Net loss		—			—		—		—		—		—			(5,042	)		(5,042	)
Balance at March 31, 2018		—		$	—		11,935,081	$	12	$	321,172	$	(4	)	$	(178,329	)	$	142,851

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

6

Catalyst Biosciences, Inc.

Condensed Consolidated Statements of Cash Flows

(In thousands)

(Unaudited)

	Three Months Ended March 31,
	2019			2018
Operating Activities
Net loss	$	(15,083	)	$	(5,042	)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense		829			606
Depreciation and amortization		45			33
Loss on disposal of property and equipment		—			116
Changes in operating assets and liabilities:
Prepaid and other current assets		96			(407	)
Accounts payable		(966	)		690
Accrued compensation and other accrued liabilities		100			(1,225	)
Change in operating lease liability and right-of-use asset		21
Deferred rent		—			128
Deferred revenue		—			(6	)
Net cash flows used in operating activities		(14,958	)		(5,107	)
Investing Activities
Proceeds from maturities of short-term investments		48,274			13,937
Purchase of investments		(39,596	)		(12,936	)
Purchases of property and equipment		(15	)		(198	)
Net cash flows provided by investing activities		8,663			803
Financing Activities
Payments for the redemption of redeemable convertible notes		—			(5,082	)
Issuance of common stock for secondary public offering, net of issuance costs		—			106,761
Issuance of common stock from stock grants and option exercises		106			—
Proceeds from exercise of warrants		—			9,545
Net cash flow provided by financing activities		106			111,224
Net increase (decrease) in cash, cash equivalents and restricted cash		(6,189	)		106,920
Cash, cash equivalents and restricted cash at beginning of the period		31,263			19,805
Cash, cash equivalents and restricted cash at end of the period(a)	$	25,074		$	126,725
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Adoption of ASC 606	$	—		$	207
Conversion of redeemable convertible notes to common stock	$	—		$	3
Unrealized gain on investments	$	17		$	4
Right-of-use asset and operating lease liability recorded upon the adoption of ASC 842, net	$	2,052		$	—

(a) The following table provides a reconciliation of cash and restricted cash to amounts reported within the condensed consolidated balance sheets:

Cash and cash equivalents	$	25,024	$	126,550
Restricted cash		50		175
Total cash and restricted cash	$	25,074	$	126,725

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

7

Catalyst Biosciences, Inc.

Notes to Condensed Consolidated Financial Statements (Unaudited)

1. Nature of Operations and Liquidity

Catalyst Biosciences, Inc. and its subsidiary (the “Company” or “Catalyst”) is a clinical-stage biopharmaceutical company focused on developing novel treatments for hemophilia and other rare bleeding disorders using our engineered subcutaneous (SQ) coagulation factors that promote blood clotting. Our facilities are located in South San Francisco, California and we operate in one segment. Prior to August 20, 2015, the name of the Company was Targacept, Inc. (“Targacept”). On August 20, 2015, Targacept completed its business combination with Catalyst.

The Company had a net loss of $15.1 million for the quarter ended March 31, 2019 and an accumulated deficit of $218.4 million as of March 31, 2019 and expects to continue to incur losses for the next several years. As of March 31, 2019, we had $105.3 million of cash, cash equivalents and short-term investments. Our primary uses of cash are to fund operating expenses, including research and development expenditures and general and administrative expenditures. Based on the current status of its research and development plans, the Company believes that its existing cash, cash equivalents and short-term investments as of March 31, 2019 will be sufficient to fund its cash requirements for at least the next 12 months from the date of the filing of this quarterly report. If, at any time, the Company’s prospects for financing its research and development programs decline, the Company may decide to reduce research and development expenses by delaying, discontinuing or reducing its funding of one or more of its research or development programs. Alternatively, the Company might raise funds through strategic collaborations, public or private financings or other arrangements. Such funding, if needed, may not be available on favorable terms, or at all.  

2. Summary of Significant Accounting Policies

Basis of Presentation

The Company’s condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and following the requirements of the Securities and Exchange Commission (the “SEC”) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by U.S. GAAP can be condensed or omitted. These financial statements have been prepared on the same basis as the Company’s annual financial statements and, in the opinion of management, reflect all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair presentation of the Company’s financial information. These interim results and cash flows for any interim period are not necessarily indicative of the results to be expected for the full year.

The accompanying condensed consolidated financial statements and related financial information should be read in conjunction with the consolidated financial statements filed with the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (“Annual Report”).

Accounting Pronouncements Recently Adopted

The Company’s significant accounting policies are included in “Part II - Item 8 - Financial Statements and Supplementary Data - Note 3 – Summary of Significant Accounting Policies” in the Company’s Annual Report. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), to enhance the transparency and comparability of financial reporting related to leasing arrangements. The Company adopted the standard effective January 1, 2019. As discussed in our Annual Report, the Company adopted the new lease standards in the first quarter of 2019. There have been no other significant changes to these accounting policies during the first three months of 2019.

At the inception of an arrangement, the Company determines whether the arrangement is or contains a lease based on the unique facts and circumstances present. Operating lease liabilities and their corresponding right-of-use assets are recorded based on the present value of lease payments over the expected lease term. The interest rate implicit in lease contracts is typically not readily determinable. As such, the Company utilizes its incremental borrowing rate, which is the rate incurred to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. Certain adjustments to the right-of-use asset may be required for items such as initial direct costs paid or incentives received.

The Company has elected to combine lease and non-lease components as a single component. The lease expense is recognized over the expected term on a straight-line basis. Operating leases are recognized on the balance sheet as right-of-use assets, operating lease liabilities, current and operating lease liabilities, non-current. As a result, the Company no longer recognizes deferred rent on the balance sheet.

8

Catalyst Biosciences, Inc.

Notes to Condensed Consolidated Financial Statements (Unaudited)

On January 1, 2019, the Company adopted the new lease accounting standard using the optional transition method under which comparative financial information is not restated and continues to apply the provisions of the previous lease accounting standard in its financial disclosures for the comparative periods. The Company also elected relevant optional practical expedients including 1) did not reassess whether expired or existing contracts are or contain a lease, 2) did not reassess the lease classifications or reassess the initial direct costs associated with expired or existing leases, and 3) did not separate lease and non-lease components of its operating leases in which it is the lessee.

The adoption of the new lease accounting standard had an impact of approximately $2.1 million on the Company's assets and liabilities and had no impact on cash provided by or used in operating, investing or financing activities on the Company's condensed consolidated statements of cash flows. The adoption of the new lease accounting standard did not impact previously reported financial results.

3. Fair Value Measurements

For a description of the fair value hierarchy and the Company’s fair value methodology, see “Part II - Item 8 - Financial Statements and Supplementary Data - Note 2 – Summary of Significant Accounting Policies” in the Company’s Annual Report. There were no significant changes in these methodologies during the three months ended March 31, 2019.

There were no transfers in or out of Level 1 or 2 during the periods presented. The following tables present the fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of March 31, 2019 and December 31, 2018 (in thousands):

	March 31, 2019
	Level 1		Level 2		Level 3		Total
Financial assets:
Money market funds(1)	$	23,475	$	—	$	—	$	23,475
U.S. government agency securities(2)		65,653				—		65,653
Federal agency securities(2)		—		14,600		—		14,600
Restricted cash (money market funds)		50		—		—		50
Total financial assets	$	89,178	$	14,600	$	—	$	103,778

(1) Included in cash and cash equivalents on accompanying condensed consolidated balance sheets.

(2) Included in short-term investments on accompanying condensed consolidated balance sheets and are classified as available-for-sale securities.

	December 31, 2018
	Level 1		Level 2		Level 3		Total
Financial assets:
Money market funds(1)	$	29,090	$	—	$	—	$	29,090
Federal agency securities(1)		—		999		—		999
U.S. Treasury securities(2)		74,139						74,139
Federal agency securities(2)				14,775		—		14,775
Restricted cash (money market funds)		50		—		—		50
Total financial assets	$	103,279	$	15,774	$	—	$	119,053

(1) Included in cash and cash equivalents on accompanying condensed consolidated balance sheets.

(2) Included in short-term investments on accompanying condensed consolidated balance sheets and are classified as available-for-sale securities.

9

Catalyst Biosciences, Inc.

Notes to Condensed Consolidated Financial Statements (Unaudited)

4. Financial Instruments

Cash equivalents, restricted cash and short-term investments (debt securities) which are classified as available-for-sale securities, consisted of the following (in thousands):

March 31, 2019	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds (cash equivalents)	$	23,475	$	—	$	—		$	23,475
U.S. government agency securities		65,645		9		(1	)		65,653
Federal agency securities		14,595		5		—			14,600
Restricted cash (money market funds)		50		—		—			50
Total financial assets	$	103,765	$	14	$	(1	)	$	103,778
Classified as:
Cash and cash equivalents								$	23,475
Short-term investments									80,253
Restricted cash (money market funds)									50
								$	103,778

December 31, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds (cash equivalents)	$	29,090	$	—	$	—		$	29,090
Federal agency securities (cash equivalents)		999		—		—			999
Restricted cash (money market funds)		50		—		—			50
U.S. government agency securities		74,144		1		(6	)		74,139
Agency securities		14,774		1		—			14,775
Total financial assets	$	119,057	$	2	$	(6	)	$	119,053
Classified as:
Cash and cash equivalents								$	30,089
Short-term investments									88,914
Restricted cash (money market funds)									50
								$	119,053

There have been no material realized gains or losses on available-for-sale securities for the periods presented. The carrying amounts of cash, accounts payable, and other payables approximate their fair values due to the short-term maturity of these instruments. As of March 31, 2019, the remaining contractual maturities of available-for-sale securities was less than one year.

5. Lease

The Company leases office space for its corporate headquarters, located in South San Francisco, CA. The lease term is through April 30, 2023 and there are no stated renewal options. Operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term. In calculating the present value of the lease payments, the Company has elected to utilize its incremental borrowing rate based on the original lease term and not the remaining lease term. The lease includes non-lease components (e.g., common area maintenance) that are paid separately from rent based on actual costs incurred and therefore were not included in the right-of-use asset and liability but are reflected as an expense in the period incurred.

For the three months ended March 31, 2019, the Company’s operating lease expense was $0.2 million. The present value assumptions used in calculating the present value of the lease payments were as follows:

Weighted-average remaining lease term	4.1 years
Weighted-average discount rate		6.0	%

10

Catalyst Biosciences, Inc.

Notes to Condensed Consolidated Financial Statements (Unaudited)

Future lease payments under non-cancelable leases as of March 31, 2019 were as follows:

Remaining in 2019	$	423
2020		578
2021		596
2022		613
2023		209
Total future minimum lease payments		2,419
Less imputed interest		(283	)
Total lease liability	$	2,136

6. Stock Based Compensation

The following table summarizes stock option activity under the Company’s equity incentive plans and related information:

	Number of Shares Underlying Outstanding Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)
Outstanding — December 31, 2018		1,361,977		$	12.04		8.71
Options granted		309,300		$	8.12
Options exercised		(12,794	)	$	4.60
Options forfeited		(39,971	)	$	7.60
Options Expired		(5,641	)	$	91.79
Outstanding — March 31, 2019		1,612,871		$	11.17		8.77
Exercisable — March 31, 2019		468,193		$	16.19		8.03
Vested and expected to vest — March 31, 2019		1,612,871		$	11.17		8.77

Valuation Assumptions

The Company estimated the fair value of stock options granted using the Black-Scholes option-pricing formula and a single option award approach. Due to its limited history as a public company and limited number of sales of its common stock, the Company estimated its volatility considering a number of factors including the use of the volatility of comparable public companies. The expected term of options granted under the Plan, all of which qualify as “plain vanilla” per SEC Staff Accounting Bulletin 107, is determined based on the simplified method due to the Company’s limited operating history and is 6.03 years based on the average between the vesting period and the contractual life of the option. The risk-free rate is based on the yield of a U.S. Treasury security with a term consistent with the option. This fair value is being amortized ratably over the requisite service periods of the awards, which is generally the vesting period.

The fair value of employee stock options was estimated using the following weighted-average assumptions for the three months ended March 31, 2019 and 2018:

	Three Months Ended March 31,
	2019			2018
Employee Stock Options:
Risk-free interest rate		2.56	%		2.40	%
Expected term (in years)		6.03			6.01
Dividend yield		—			—
Volatility		82.91	%		109.32	%
Weighted-average fair value of stock options granted	$	5.80		$	12.34

11

Catalyst Biosciences, Inc.

Notes to Condensed Consolidated Financial Statements (Unaudited)

Total stock-based compensation recognized was as follows (in thousands):

	Three Months Ended March 31,
	2019		2018
Research and development	$	238	$	115
General and administrative(1)		591		491
Total stock-based compensation	$	829	$	606

(1) 2018 includes $0.1 million in modification stock-based compensation expense related to a Board member’s departure.

As of March 31, 2019, 1,031,456 shares of common stock were available for future grant and 1,612,871 options to purchase shares of common stock were outstanding. As of March 31, 2019, the Company had unrecognized employee stock-based compensation expense of $7.4 million, related to unvested stock awards, which is expected to be recognized over an estimated weighted-average period of 2.93 years.

7. Collaborations

Pfizer

Pursuant to the termination agreement entered into on December 8, 2016, in connection with the termination of a prior license and development agreement, Pfizer granted the Company an exclusive license to Pfizer’s proprietary rights for manufacturing materials and processes that apply to Factor VIIa variants, CB 813a and marzeptacog alfa (activated) - MarzAA. Pfizer also transferred to the Company the IND application and documentation related to the development, manufacturing and testing of the Factor VIIa products as well as the orphan drug designation. The Company agreed to make contingent cash payments to Pfizer in an aggregate amount equal to up to $17.5 million, payable upon the achievement of clinical, regulatory and commercial milestones. Following commercialization of any covered product, Pfizer will also receive a single-digit royalty on net product sales on a country-by-country basis for a predefined royalty term. In February 2018, the Company paid Pfizer a $1 million milestone payment based on the dosing of the first patient in its ongoing Phase 2 study; the amount was recorded as a research and development expense. No payments were made to Pfizer in the first quarter of 2019.

ISU Abxis

In December 2018, the Company entered into an amended and restated license agreement with ISU Abxis (the “A&R ISU Abxis Agreement”), which amended and restated its previous license and collaboration agreement with ISU Abxis previously entered into in September 2013, as subsequently amended in October 2014 and December 2016 (the “Original ISU Abxis Agreement”). Under the A&R ISU Abxis Agreement, ISU Abxis will receive commercialization rights in South Korea to our engineered Factor IX dalcinonacog alfa - DalcA and the Company will receive clinical development and commercialization rights in the rest of world (excluding South Korea) and manufacturing development and manufacturing rights worldwide (including South Korea). The A&R ISU Abxis Agreement eliminates the profit-sharing arrangement in the Original ISU Abxis Agreement and provides for a low single-digit royalty payment to ISU Abxis, on a country-by-country basis, for net product sales of DalcA by the Company or its affiliates in each country other than South Korea. Pursuant to the A&R ISU Abxis Agreement, the Company will also pay up to an aggregate of $19.5 million in milestone payments to ISU Abxis, including $2.5 million in regulatory and development milestone payments and up to $17 million in commercial milestone payments, if the applicable milestones are met.

8. Net Loss per Share Attributable to Common Stockholders

The following table sets forth the computation of the basic and diluted net loss per common share during the three months ended March 31, 2019 and 2018 (in thousands, except share and per share data):

	Three Months Ended March 31,
	2019			2018
Net loss attributable to common stockholders	$	(15,083	)	$	(5,042	)
Weighted-average number of shares used in computing net loss per    share, basic and diluted		11,963,586			8,989,669
Net loss available for common stockholders per share, basic and    diluted	$	(1.26	)	$	(0.56	)

12

Catalyst Biosciences, Inc.

Notes to Condensed Consolidated Financial Statements (Unaudited)

Since the Company was in a loss position for all periods presented, diluted net loss per share is the same as basic net loss per share for all periods as the inclusion of all potential common shares outstanding would have been anti-dilutive. Potentially dilutive securities on an as-if converted basis that were not included in the diluted per share calculations because they would be anti-dilutive were as follows:

	Three Months Ended March 31,
	2019		2018
Options to purchase common stock		1,612,871		1,026,393
Common stock warrants		10,194		12,039
Redeemable convertible notes		—		—
Total		1,623,065		1,038,432

9. Stockholders’ Equity

February 2018 Underwritten Public Offering — On February 13, 2018, the Company entered into an underwriting agreement with JonesTrading, in connection with a registered firm commitment underwritten public offering of 2,941,176 shares of common stock, pursuant to a shelf registration statement that was declared effective by the SEC on February 6, 2018. On February 15, 2018, the Company sold 3,382,352 shares of common stock (including 441,176 shares of common stock sold pursuant to the exercise of the underwriters’ overallotment option) at a price to the public of $34.00 per share. The net proceeds to the Company, after deducting the underwriting discounts and commissions and offering expenses payable by the Company were approximately $106.8 million.

10. Commitments and Contingencies

Manufacturing Agreements

On May 20, 2016, the Company signed a development and manufacturing services agreement with AGC Biologics, Inc. (“AGC”), formerly known as CMC ICOS Biologics, Inc., pursuant to which AGC will conduct manufacturing development of agreed upon product candidates. The Company currently has firm work orders with AGC to manufacture MarzAA and DalcA to support its clinical trials totaling $9.4 million and the payment obligations remaining at March 31, 2019 was $4.6 million.

11. Related Parties

On October 24, 2017 the Company announced a strategic research collaboration with Mosaic Biosciences, Inc. (“Mosaic”) to develop intravitreal anti-complement factor 3 products for the treatment of dry age-related macular degeneration and other retinal diseases. According to the agreement the Company and Mosaic will co-fund the research. Dr. Usman, our Chief Executive Officer and a member of our board of directors, and Mr. Lawlor, the chairman of our board of directors, were also members of the board of directors of Mosaic when this agreement was entered in to, and the agreement was reviewed by disinterested members of our board of directors and approved by our audit committee. Expenses related to the collaboration were $0.3 and $0.2 million for the three months ended March 31, 2019 and 2018, respectively.

12. Interest and Other Income

The following table shows the detail of interest and other income/(expense), net for the three-month periods ended March 31, 2019 and 2018 (in thousands):

	Three Months Ended March 31,
	2019		2018
Interest income	$	631	$	285
Loss on disposal of fixed assets		—		(116	)
Other income, net		—		1,468
Total other income/(expense), net	$	631	$	1,637

Other income of $1.5 million for the three months ended March 31, 2018, reflects milestone payments received under an agreement associated with neuronal nicotinic receptor assets sold in 2016.

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

Unless otherwise indicated, in this Quarterly Report on Form 10-Q, (i) references to “Catalyst,” “we,” “us,” “our” or the “Company” mean Catalyst Biosciences, Inc. and our subsidiaries. The following discussion and analysis of our financial condition and results of operations should be read in conjunction with the consolidated financial statements and related notes that appear in this Quarterly Report on Form 10-Q (“Report”).

In addition to historical information, this Report contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (“The Exchange Act”). Forward-looking statements are identified by words such as “believe,” “will,” “may,” “estimate,” “continue,” “anticipate,” “intend,” “should,” “plan,” “expect,” “predict,” “could,” “potentially” or the negative of these terms or similar expressions. You should read these statements carefully because they discuss future expectations, contain projections of future results of operations or financial condition, or state other “forward-looking” information. These statements relate to our future plans, objectives, expectations, intentions and financial performance and the assumptions that underlie these statements. For example, forward-looking statements include any statements regarding the strategies, prospects, plans, expectations or objectives of management for future operations, the progress, scope or duration of the development of product candidates or programs, clinical trial plans, timelines and potential results, the benefits that may be derived from product candidates or the commercial or market opportunity in any target indication, our ability to protect intellectual property rights, our anticipated operations, financial position, revenues, costs or expenses, statements regarding future economic conditions or performance, statements of belief and any statement of assumptions underlying any of the foregoing. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those anticipated in the forward-looking statements. Factors that might cause such a difference include, but are not limited to, those discussed in this report in Part II, Item 1A — “Risk Factors,” elsewhere in this Report and in Part I - Item 1A – “Risk Factors” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (“Annual Report”). Forward-looking statements are based on our management’s beliefs and assumptions and on information currently available to our management. These statements, like all statements in this report, speak only as of their date, and we undertake no obligation to update or revise these statements in light of future developments. We caution investors that our business and financial performance are subject to substantial risks and uncertainties.

Overview

We are a clinical-stage biopharmaceutical company focused on developing novel treatments for hemophilia and other rare bleeding disorders using our potent, subcutaneous (SQ) coagulation factors that promote blood clotting. Our engineered coagulation factors are designed to overcome the significant limitations of current intravenous (IV) treatment options, facilitate prophylaxis, and ultimately deliver substantially better outcomes for patients using SQ dosing.

Hemophilia is a rare but serious bleeding disorder that results from a genetic or an acquired deficiency of a factor required for normal blood coagulation. There are two major types of hemophilia, A and B, that are caused by alterations in Factor VIII or Factor IX genes, respectively, with a corresponding reduction in the ability to generate a blood clot. The disease is X chromosome-linked, meaning that most people who inherit the disorder and suffer from symptoms are male; however, female carriers of mutations in Factor VIII or Factor IX can also have reduced coagulation factor levels and resultant bleeding. Hemophilia A occurs in approximately 1 in 5,000 male births, and hemophilia B in approximately 1 in 20,000 male births. The prevalence of hemophilia A and B in the United States is approximately 20,000 individuals out of an estimated 400,000 individuals worldwide. Currently there is no cure for hemophilia. Individuals with hemophilia suffer from spontaneous bleeding episodes and substantially prolonged bleeding times that can become limb- or life-threatening following injury or trauma. In cases of severe hemophilia, spontaneous bleeding into muscles or joints is frequent and often results in disabling joint damage.

The New Standard in Hemophilia Management

Patients with hemophilia either do not generate sufficient levels of a coagulation factor or a functional coagulation factor. Current treatment involves management of acute bleeding episodes or prophylactic treatment through factor replacement therapy by IV infusion of the individuals’ missing Factor VIII or IX. Intravenous infusion is difficult, time consuming and particularly challenging to administer to children. Another significant challenge in managing patients with hemophilia is the risk for development of inhibitors, which reduce the efficacy of the Factor replacement. This occurs in approximately 30% of hemophilia A and 5-10% of hemophilia B patients. Inhibitor patients are treated with an IV treatment of either NovoSeven RT® or FEIBA; more recently, SQ Hemlibra^® has been approved for hemophilia A inhibitor patients.

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We are focused on the clinical development of our subcutaneously dosed, next-generation Factor VIIa (marzeptacog alfa (activated) – MarzAA) for the treatment of hemophilia A and B inhibitor patients, and Factor IX (dalcinonacog alfa – DalcA) for hemophilia B patients. We believe that SQ prophylaxis will provide effective and convenient protection from spontaneous bleeds. Preclinical and Phase 1 clinical studies showed that MarzAA is nine-fold more potent than NovoSeven RT, the current leading Factor VIIa bypass therapy, and that DalcA is 22-fold more potent than BeneFIX, the current leading Factor IX replacement therapy. The enhanced potency of both products allows for SQ dosing using a small volume. We believe dosing of our novel factors for prophylaxis is potentially more efficacious because of prolongation of half-life and greater convenience, especially for children. We currently control worldwide development, manufacturing and commercialization rights of our product candidates. DalcA commercialization rights in Korea are assigned to ISU Abxis, our collaborator who performed development through Phase 1/2. Both MarzAA and DalcA have received orphan drug designation in the U.S. and in the E.U.

We estimate the global market opportunity for MarzAA and DalcA to be approximately $3.7 billion: $2.2 billion for the Factor VIIa market and $1.5 billion for the Factor IX market.  

Recent Program Updates

MarzAA

We have completed enrollment and dosing of our Phase 2 open-label SQ efficacy trial. The Phase 2 trial demonstrated the ability of MarzAA substantially to eliminate spontaneous bleeding at the final dose level and to minimize traumatic bleeding episodes in individuals with hemophilia A or B with inhibitors. The primary endpoint was reduction in annualized bleed rate (“ABR”) at an individualized final dose level and secondary endpoints included safety, tolerability and lack of neutralizing antibody (nAb) formation. We recently reported at the European Alliance for Hemophilia and Allied Disorders (EAHAD) meeting on February 8th 2019 that seven subjects who completed dosing had a pre-dose mean ABR of 18.2 (range of 12.2-26.7) that was reduced to 2.1 (>90% reduction); and five of the seven had no bleeds for 50 days at the lowest dose (30 µg/kg). No anti-drug antibodies or nAbs to MarzAA or thrombotic events have been observed to date, and only six injection site reactions have been reported after more than 450 injections. Final results from all nine subjects that completed dosing in the Phase 2 open-label trial will be presented at the International Society for Thrombosis & Hemostasis (ISTH) meeting in July 2019. We plan to initiate a Phase 3 registration study in 2020. We will initiate a SQ Phase 1 pharmacokinetic and pharmacodynamic study in the second quarter of 2019 and expect that study to conclude in the fourth quarter of 2019.We have also completed an IV Phase 1 clinical trial evaluating the pharmacokinetics, pharmacodynamics and coagulation activity of MarzAA in individuals with severe hemophilia A and B with and without an inhibitor.

DalcA

We have completed a Phase 1/2 subcutaneous dosing trial that evaluated the safety and efficacy of DalcA in individuals with severe hemophilia B. The objective of the Phase 1/2 trial was to demonstrate the feasibility of increasing Factor IX activity trough levels from approximately 1% (severe hemophilia) to greater than 12% (mild hemophilia corresponding to a reduced chance of spontaneous joint bleeds) with daily SQ injections. Data from the study demonstrated that DalcA maintained protective Factor IX activity levels of 12 – 30%. Two subjects in the Phase 1/2 SQ dosing trial developed nAbs, one transiently. The nAbs were specific to DalcA and did not interfere with the patients’ ability to resume use of their prior FIX therapy so are not referred to as inhibitors. We completed a comprehensive investigation of the cause of the nAbs in 2018 and concluded that the immunogenic potential of DalcA was low and similar to that of commercial Factor IX products and that drug product quality is comparable to commercial Factor IX products. Based on the results of the investigation, and discussions with clinicians and regulatory experts, we have initiated a Phase 2b trial to assess safety and efficacy of DalcA, that will include 28 days of daily SQ dosing in six subjects, and we expect the trial to be completed in the second half of 2019.

Pipeline Assets

We have three additional drug candidates: a Factor IX gene therapy construct CB 2679d-GT; a novel anti-C3 protease program for the treatment of dry AMD, CB 2782 for which we have a strategic research collaboration with Mosaic Biosciences; and a Factor Xa pro-coagulant molecule.

The Factor IX gene therapy construct CB 2679d-GT has demonstrated 3-fold higher activity and 4-5-fold faster clotting time in a preclinical hemophilia B mouse model compared with the Padua variant of Factor IX that is in clinical development by others. Pfizer/Spark (fidanacogene elaparvovec) and uniQure (AMT-061) use the Padua variant as the transgene in their AAV based gene therapy clinical programs and both have demonstrated encouraging Factor IX levels in their respective Phase 1/2 and Phase 2/3 studies with median Factor IX levels of approximately 30%. We are currently optimizing the construct and will make a strategic decision on its future development at the end of this year.

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We have created a modified version of our anti-C3 protease CB 2782, CB 2782-PEG, that is designed to have an extended half-life. Complement factor 3 (C3) is the central regulator of the complement cascade and C3 is a clinically validated target for geographic atrophy in age-related macular degeneration. CB 2782-PEG has indistinguishable enzymatic activity from CB 2782, inactivating C3 at the same rate as unmodified CB 2782. We have completed an intravitreal rabbit pharmacokinetics study and an intravitreal non-human primate pharmacokinetics, pharmacodynamics studycomparing CB 2782-PEG with CB 2782.A single intravitreal injection of 125μg of CB2782-PEG had a greater than 99% elimination of C3 in non-human primate for at least 28 days.Data from these studies indicate CB2782-PEG is potentially a best-in-class anti-complement factor 3 therapy, with an intravitreal administration frequency of three to four times a year.

We have delayed initiating further work on our Factor Xa therapeutic program at this time to focus our efforts on the MarzAA and DalcA clinical programs.

Summary of Our Pipeline

We have no products approved for commercial sale and have not generated any revenue from product sales. From inception to March 31, 2019, we have raised net cash proceeds of approximately $373.0 million, primarily from private placements of convertible preferred stock and the proceeds from our merger with Targacept in addition to issuances of shares of common stock and warrants, and payments received from collaboration agreements.

We have never been profitable and have incurred significant operating losses in each year since inception. Our net losses were $15.1 million and $5.0 million for the three months ended March 31, 2019 and 2018, respectively. As of March 31, 2019, we had an accumulated deficit of $218.4 million. As of March 31, 2019, our cash, cash equivalents and short-term investments balance is $105.3 million. Substantially all our operating losses resulted from manufacturing expenses and losses incurred in our research and development programs and from general and administrative costs associated with our operations.

We expect to incur significant expenses and increasing operating losses for at least the next several years as we continue the preclinical, manufacturing and clinical development, and seek regulatory approval for our drug candidates. In addition, our expenses have increased due to hiring additional financial personnel, upgrading our financial information systems and incurring costs associated with being a public company. In addition, our operating losses may fluctuate significantly from quarter to quarter and year to year due to timing of preclinical, clinical development programs and regulatory approval.

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Financial Operations Overview

Contract Revenue

We did not generate any revenue in the first quarter of 2019 and do not expect to generate revenue in the next three quarters of 2019. Revenue generated in 2018 was from our collaboration with ISU Abxis which was effectively terminated through an amendment in December 2018.

Research and Development Expenses

Research and development expenses represent costs incurred to conduct research, such as the discovery and development of our product candidates. We recognize all research and development costs as they are incurred.

Research and development expenses consist primarily of the following:

• employee-related expenses, which include salaries, benefits and stock-based compensation;

• laboratory and vendor expenses, including payments to consultants, related to the execution of preclinical, non-clinical, and clinical studies;

• the cost of acquiring and manufacturing preclinical and clinical materials and developing manufacturing processes;

• clinical trial expenses, including costs of third-party clinical research organizations;

• performing toxicity studies; and

• facilities and other allocated expenses, which include direct and allocated expenses for rent and maintenance of facilities, depreciation and amortization expense and other supplies.

The following table summarizes our research and development expenses during the three months ended March 31, 2019 and 2018 (in thousands):

	Three Months Ended March 31,
	2019		2018
Personnel costs	$	2,045	$	713
Preclinical research		845		448
Clinical manufacturing		8,911		2,399
Facility and overhead		226		211
Total research and development expenses	$	12,027	$	3,771

The largest component of our total operating expenses has historically been our investment in research and development activities, including the clinical and manufacturing development of our product candidates. We are currently focusing substantially all our resources and development efforts on MarzAA and DalcA. Our internal resources, employees and infrastructure are not directly tied to individual product candidates or development programs. As such, we do not maintain information regarding these costs incurred for these research and development programs on a project-specific basis.

We expect our aggregate research and development expenses will increase during the next year as we advance the clinical and manufacturing development of MarzAA and DalcA. While ISU Abxis has previously been responsible for clinical and development expenses for DalcA under our agreement with them, their funding obligations have expired, and we have assumed responsibility for these expenses.

On May 20, 2016, we signed a development and manufacturing services agreement with AGC Biologics, Inc. (“AGC”), formerly known as CMC ICOS Biologics, Inc., pursuant to which AGC will conduct manufacturing development of agreed upon product candidates. We will own all intellectual property developed in such manufacturing development activities that are specifically related to our product candidates and will have a royalty-free and perpetual license to use AGC’s intellectual property to the extent reasonably necessary to make these product candidates, including commercial manufacturing. In 2016 we commenced manufacturing activities for MarzAA, and successfully manufactured MarzAA for the Phase 2 portion of a planned Phase 2/3 clinical trial. In February 2018 we entered into a statement of work for AGC for process transfer and clinical scale manufacturing of DalcA.

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The initial term of the agreement is ten years or, if later, until all stages under outstanding statements of work have been completed. Either party may terminate the agreement in its entirety upon written notice of a material uncured breach or upon the other party’s bankruptcy, and we may terminate the agreement upon prior notice for any reason. In addition, each party may terminate the agreement in the event that the manufacturing development activities cannot be completed for technical or scientific reasons. We have committed to a total of $9.4 million in payments to AGC pursuant to the statements of work for MarzAA and DalcA and $4.6 million of those payments are outstanding at March 31, 2019.

The process of conducting clinical trials necessary to obtain regulatory approval is costly and time consuming. We may never succeed in achieving marketing approval for our product candidates. The probability of success of each product candidate may be affected by numerous factors, including clinical data, competition, manufacturing capability and commercial viability. As a result, we are unable to determine the duration of and costs to complete our research and development projects or when and to what extent we will generate revenue from the commercialization and sale of any of our product candidates.

Successful development of current and future product candidates is highly uncertain. Completion dates and costs for our research programs can vary significantly for each current and future product candidate and are difficult to predict. Thus, we cannot estimate with any degree of certainty the costs we will incur in the development of our product candidates. We anticipate we will make determinations as to which programs and product candidates to pursue and how much funding to direct to each program and product candidate on an ongoing basis in response to the scientific success of early research programs, results of ongoing and future clinical trials, our ability to enter into collaborative agreements with respect to programs or potential product candidates, as well as ongoing assessments as to each current or future product candidate’s commercial potential.

General and Administrative Expenses

General and administrative expenses consist of personnel costs, allocated expenses and other expenses for outside professional services, including legal, human resources, audit and accounting services. Personnel costs consist of salaries, bonus, benefits and stock-based compensation. We incur expenses associated with operating as a public company, including expenses related to compliance with the rules and regulations of the SEC and Nasdaq Stock Market LLC (“Nasdaq”), insurance expenses, audit expenses, investor relations activities, Sarbanes-Oxley compliance expenses and other administrative expenses and professional services. We expect such expenses to continue.

Interest and Other Income, Net

Interest and other income consist primarily of interest income on our investment portfolio and milestone payments received under an agreement associated with neuronal nicotinic receptor assets sold in 2016.

Results of Operations

The following tables set forth our results of operations data for the periods presented (in thousands):

	Three Months Ended March 31,
	2019			2018			Change ($)			Change (%)
Contract revenue	$	—		$	6		$	(6	)		(100	)%
Operating expenses:
Research and development		12,027			3,771			8,256			219	%
General and administrative		3,687			2,914			773			27	%
Total operating expenses		15,714			6,685			9,029			135	%
Loss from operations		(15,714	)		(6,679	)		(9,035	)		135	%
Interest and other income		631			1,637			(1,006	)		(61	)%
Net loss	$	(15,083	)	$	(5,042	)	$	(10,041	)		199	%

Contract Revenue

Contract revenue was $0 and $0.01 million during the three months ended March 31, 2019 and 2018, respectively. Revenue generated in 2018 was from our collaboration with ISU Abxis which was effectively terminated through an amendment in December 2018.

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Research and Development Expenses

Research and development expenses were $12.0 million and $3.8 million during the three months ended March 31, 2019 and 2018, respectively, an increase of $8.3 million, or 219%. The increase was due primarily to an increase of $6.5 million in manufacturing development as we continued to advance the development of the MarzAA and DalcA product candidates, an increase of $1.3 million in personnel-related costs and an increase of $0.4 million in preclinical third-party research and development service contracts.

General and Administrative Expenses

General and administrative expenses was $3.7 million and $2.9 million during the three months ended March 31, 2019 and 2018, respectively, an increase of $0.8 million, or 27%. The increase was due primarily to an increase of $0.3 million in personnel-related costs and an increase of $0.4 million in several professional services costs including patent legal services and commercial market assessment.

Interest and Other Income

Interest and other income was $0.6 million and $1.6 million during the three months ended March 31, 2019 and 2018, respectively, a decrease of $1.0 million, or 61%. The decrease was due primarily to a contingent milestone payment of $1.5 million received in 2018, partially offset by higher interest income in 2019 of $0.3 million due to higher cash equivalent and short-term investments balance in 2019.

Recent Accounting Pronouncements

Accounting Pronouncements Recently Adopted

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which replaces the existing guidance for leases. The new standard establishes a right-of-use (ROU) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Disclosure requirements have been enhanced with the objective of enabling financial statement users to assess the amount, timing, and uncertainty of cash flows arising from leases.  ASU 2016-02 became effective for us beginning in the first quarter of 2019. We have implemented the standard using the modified retrospective method that allows us to initially apply the new leases standard as of the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. In connection with the adoption, we have elected to utilize the package of practical expedients, including: (1) not reassess the lease classification for any expired or existing leases, (2) not reassess the treatment of initial direct costs as they related to existing leases, and (3) not reassess whether expired or existing contracts are or contain leases. We also elected the practical expedient to not separate lease and non-lease components of its operating leases in which it is the lessee.

The adoption of the new lease accounting standard had an impact of approximately $2.1 million on the Company's assets and liabilities and had no impact on cash provided by or used in operating, investing or financing activities on the Company's condensed consolidated statements of cash flows. The adoption of the new lease accounting standard did not impact previously reported financial results.

Liquidity and Capital Resources

As of March 31, 2019, we had $105.3 million of cash, cash equivalents and short-term investments and a $15.1 million net loss and $15.0 million cash used in operating activities for the three months ended March 31, 2019. We have an accumulated deficit of $218.4 million as of March 31, 2019. Our primary uses of cash are to fund operating expenses, including research and development expenditures and general and administrative expenditures. Cash used to fund operating expenses is impacted by the timing of when we pay these expenses, as reflected in the change in our outstanding accounts payable and accrued expenses.

We believe that our existing capital resources, including cash, cash equivalents and short-term investments will be sufficient to meet our projected operating requirements for at least the next 12 months from the date of this filing. We have based this estimate on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we currently expect. We plan to continue to fund losses from operations and capital funding needs through future equity and/or debt financings, as well as potential additional asset sales, licensing transactions, collaborations or strategic partnerships with other companies. We have effective registration statements on Form S-3 that enable us to sell up to $268 million in securities. The sale of additional equity or convertible debt could result in additional dilution to our stockholders. The incurrence of indebtedness would result in debt service obligations and could result in operating and financing covenants that would restrict our operations. Licensing transactions, collaborations or strategic partnerships may result in us relinquishing valuable rights. We can provide no assurance that financing will be available in the amounts we need or on terms acceptable to us, if at all. If we are not able to secure adequate additional funding we may be forced to delay, make reductions in spending, extend payment terms with suppliers, liquidate assets where possible, and/or suspend or curtail planned programs. Any of these actions could materially harm our business.

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The following table summarizes our cash flows for the periods presented (in thousands):

	Three Months Ended March 31,
	2019			2018
Cash used in operating activities	$	(14,958	)	$	(5,107	)
Cash provided by investing activities		8,663			803
Cash provided by financing activities		106			111,224
Net increase (decrease) in cash, cash equivalents and    restricted cash	$	(6,189	)	$	106,920

Cash Flows from Operating Activities

Cash used in operating activities for the three months ended March 31, 2019 was $15.0 million, due primarily to a net loss of $15.1 million, and the change in our net operating assets and liabilities of $0.8 million due primarily to a $1.0 million decrease in accounts payable offset by a $0.2 million decrease in the prepaid and other current assets net of the release of prepaid rent and the related liability upon the adoption of Topic 842. Non-cash charges of $0.8 million were recorded for stock-based compensation.  

Cash used in operating activities for the three months ended March 31, 2018 was $5.1 million, due primarily to a net loss of $5.0 million, the change in our net operating assets and liabilities of $0.8 million due primarily to a $1.2 million decrease in accrued compensation and other accrued liabilities and a $0.4 million increase in prepaid expenses, partially offset by a $0.7 million increase in accounts payable and a $0.1 million increase in deferred rent. Non-cash charges of $0.6 million were recorded for stock-based compensation, and a $0.1 million for loss on the disposal of property and equipment.  

Cash Flows from Investing Activities

Cash provided by investing activities for the three months ended March 31, 2019 was $8.7 million, due primarily to $48.3 million in proceeds from maturities of investments, partially offset by $39.6 million in purchases of investments and $0.02 million in purchase of assets.

Cash provided by investing activities for the three months ended March 31, 2018 was $0.8 million, due primarily to $13.9 million in proceeds from maturities of investments, partially offset by $12.9 million in purchases of investments and $0.2 million in purchase of assets.

Cash Flows from Financing Activities

Cash provided by financing activities for the three months ended March 31, 2019 was $0.1 million, due entirely to proceeds from issuance of common stock related to our Employee Stock Purchase Plan and stock option exercises.

Cash provided by financing activities for the three months ended March 31, 2018 was $111.2 million, due primarily to net proceeds from the issuance of common stock related to our secondary public offering in February 2018, $9.5 million in proceeds from the exercise of common stock warrants, partially offset by payments of $5.1million related to the maturity and redemption of the remaining redeemable notes.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet arrangements.

Critical Accounting Polices and Estimates

The Company’s significant accounting policies are included in “Part II - Item 8 - Financial Statements and Supplementary Data - Note 3 – Summary of Significant Accounting Policies” in the Company’s Annual Report. As discussed in our Annual Report, the Company adopted the new leases standards in the first quarter of 2019 and otherwise, there have been no other significant changes to our accounting policies during the first three months of 2019.

See Recent Accounting Pronouncements above for effects of adoption on our condensed consolidated statement of operations for the three months ended March 31, 2019 and on our condensed consolidated balance sheet as of January 1, 2019.

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ITEM 3. Quantitative and Qualitative Disclosures About Market Risk

Market risk represents the risk of loss that may impact our financial position due to adverse changes in financial market prices and interest rates. We are exposed to market risks in the ordinary course of our business. Our primary exposure to market risk is interest income sensitivity in our investment portfolio. Fixed rate securities and borrowings may have their fair market value adversely impacted due to fluctuations in interest rates, while floating rate securities may produce less income than expected if interest rates fall and floating rate borrowings may lead to additional interest expense if interest rates increase. Due in part to these factors, our future investment income may fall short of expectations due to changes in interest rates or we may suffer losses in principal if forced to sell securities which have declined in market value due to changes in interest rates.

However, because of the short-term nature of the instruments in our portfolio, a sudden change in market interest rates would not be expected to have a material impact on the fair market value of our investment portfolio. As of March 31, 2019, we had cash and cash equivalents and short-term investments of $105.3 million, which included bank deposits and money market funds and short-term investments of $80.3 million. Accordingly, we do not expect our operating results or cash flows to be affected to any significant degree by the effect of a sudden change in market interest rates on our investment portfolio.

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Management, with the participation of our Chief Executive Officer and our Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures as of March 31, 2019. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to our management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure.

Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of March 31, 2019, our Chief Executive Officer and Chief Financial Officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

Changes in Internal Control Over Financial Reporting

There has been no change in our internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) identified during the first three months of 2019 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

We are not a party to any material legal proceedings.

ITEM 1A. RISK FACTORS

Our business is subject to risks and events that, if they occur, could adversely affect our financial condition and results of operations and the trading price of our securities. Our risk factors have not changed materially from those described in “Part I - Item 1A - Risk Factors” in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018, filed with the Securities and Exchange Commission on March 8, 2019.

You should carefully consider the risks and uncertainties disclosed as “Risk Factors” in our Annual Report, together with all of the other information in this Report, including the section titled “Part I - Financial Information - Item 2 - Management’s Discussion and Analysis of Financial Condition and Results of Operations” and the condensed consolidated financial statements and related notes.  

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

None.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

None.

ITEM 6. EXHIBITS

See Index to Exhibits at the end of this Report, which is incorporated by reference here. The Exhibits listed in the accompanying Index to Exhibits are filed as part of this Report.

22

EXHIBIT INDEX

Exhibit Number	Description
31.1	Certification of the Principal Executive Officer pursuant to Rule 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of the Principal Financial Officer pursuant to Rule 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of the Principal Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of the Principal Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101	The following materials from the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2019, formatted in XBRL (eXtensible Business Reporting Language): (i) the Condensed Consolidated Balance Sheets as of March 31, 2019 (unaudited) and December 31, 2018; (ii) the Condensed Consolidated Statements of Comprehensive Income for the three months ended March 31, 2019 and 2018 (unaudited); (iii) the Condensed Consolidated Statement of Stockholders’ Equity as of March 31, 2019 (unaudited); (iv) the Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2019 and 2018 (unaudited); and (v) the Notes to Unaudited Interim Condensed Consolidated Financial Statements.

23

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.

	CATALYST BIOSCIENCES, INC.
Date: May 2, 2019	/s/ Nassim Usman, Ph.D.
	Nassim Usman, Ph.D.
	President and Chief Executive Officer
	(Principal Executive Officer)
Date: May 2, 2019	/s/ Fletcher Payne
	Fletcher Payne
	Chief Financial Officer
	(Principal Financial and Accounting Officer)

24

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF THE SECURITIES EXCHANGE ACT

OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Nassim Usman, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Catalyst Biosciences, 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 officer(s) 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;

5. The registrant’s other certifying officer(s) 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: May 2, 2019	/s/ Nassim Usman, Ph.D.
	Nassim Usman, Ph.D.

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF THE SECURITIES EXCHANGE ACT

OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Fletcher Payne, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Catalyst Biosciences, 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 officer(s) 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;

5. The registrant’s other certifying officer(s) 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: May 2, 2019	/s/ Fletcher Payne
	Fletcher Payne

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Catalyst Biosciences, Inc. (the “Company”) for the period ended March 31, 2019 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Nassim Usman, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

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

Date: May 2, 2019	/s/ Nassim Usman, Ph.D.
	Nassim Usman, Ph.D.
	President and Chief Executive Officer (Principal Executive Officer)

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Catalyst Biosciences, Inc. (the “Company”) for the period ended March 31, 2019 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Fletcher Payne, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

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

Date: May 2, 2019	/s/ Fletcher Payne
	Fletcher Payne
	Chief Financial Officer (Principal Financial and Accounting Officer)

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	CBIO
Entity Registrant Name	CATALYST BIOSCIENCES, INC.
Entity Central Index Key	0001124105
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		11,980,103

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 25,024	$ 31,213
Short-term investments	80,253	88,914
Restricted cash	50	50
Prepaid and other current assets	3,675	3,814
Total current assets	109,002	123,991
Other assets, noncurrent	197	543
Right-of-use assets	2,315
Property and equipment, net	356	386
Total assets	111,870	124,920
Current liabilities:
Accounts payable	282	1,248
Accrued compensation	876	1,495
Other accrued liabilities	2,762	2,043
Deferred rent, current portion		15
Operating lease liability	450
Total current liabilities	4,370	4,801
Operating lease liability, noncurrent	1,686
Deferred rent, noncurrent portion		174
Total liabilities	6,056	4,975
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized; zero shares issued and outstanding
Common stock, $0.001 par value, 100,000,000 shares authorized; 11,974,104 and 11,954,528 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	12	12
Additional paid-in capital	324,214	323,279
Accumulated other comprehensive income (loss)	13	(4)
Accumulated deficit	(218,425)	(203,342)
Total stockholders’ equity	105,814	119,945
Total liabilities and stockholders’ equity	$ 111,870	$ 124,920

XML

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	11,974,104	11,954,528
Common stock, shares outstanding	11,974,104	11,954,528

XML

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Contract revenue		$ 6
Type of Revenue [Extensible List]	cbio:ContractMember	cbio:ContractMember
Operating expenses:
Research and development	$ 12,027	$ 3,771
General and administrative	3,687	2,914
Total operating expenses	15,714	6,685
Loss from operations	(15,714)	(6,679)
Interest and other income, net	631	1,637
Net loss	$ (15,083)	$ (5,042)
Net loss per share attributable to common stockholders, basic and diluted	$ (1.26)	$ (0.56)
Shares used to compute net loss per share attributable to common stockholders, basic and diluted	11,963,586	8,989,669

XML

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (15,083)	$ (5,042)
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale securities	17	(4)
Total comprehensive loss	$ (15,066)	$ (5,046)

XML

Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance at Dec. 31, 2017	$ 30,774		$ 6	$ 204,262		$ (173,494)
Balance (in shares) at Dec. 31, 2017		3,680	6,081,230
Opening balance adjustment - adoption of ASC 606 at Dec. 31, 2017	207					207
Balance at Dec. 31, 2017	30,981		$ 6	204,262		(173,287)
Stock-based compensation expense	606			606
Issuance of common stock for secondary public offering, net of issuance costs	106,762		$ 4	106,758
Issuance of common stock for secondary public offering, net of issuance costs, shares			3,382,352
Issuance of common stock upon exercise of warrants	9,545		$ 2	9,543
Issuance of common stock upon exercise of warrants, shares			1,735,419
Conversion of preferred stock to common stock, shares		(3,680)	736,000
Issuance of common stock from stock grants and option exercises, shares			59
Conversion of redeemable convertible notes to common stock, value	3			3
Conversion of redeemable convertible notes to common stock, shares			21
Unrealized gain (loss) on available-for-sale securities	(4)				$ (4)
Net loss	(5,042)					(5,042)
Balance at Mar. 31, 2018	142,851		$ 12	321,172	(4)	(178,329)
Balance (in shares) at Mar. 31, 2018			11,935,081
Balance at Dec. 31, 2018	119,945		$ 12	323,279	(4)	(203,342)
Balance (in shares) at Dec. 31, 2018			11,954,528
Stock-based compensation expense	829			829
Issuance of common stock from stock grants and option exercises	106			106
Issuance of common stock from stock grants and option exercises, shares			19,576
Unrealized gain (loss) on available-for-sale securities	17				17
Net loss	(15,083)					(15,083)
Balance at Mar. 31, 2019	$ 105,814		$ 12	$ 324,214	$ 13	$ (218,425)
Balance (in shares) at Mar. 31, 2019			11,974,104

XML

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Operating Activities
Net loss		$ (15,083)	$ (5,042)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense		829	606
Depreciation and amortization		45	33
Loss on disposal of property and equipment			116
Changes in operating assets and liabilities:
Prepaid and other current assets		96	(407)
Accounts payable		(966)	690
Accrued compensation and other accrued liabilities		100	(1,225)
Change in operating lease liability and right-of-use asset		21
Deferred rent			128
Deferred revenue			(6)
Net cash flows used in operating activities		(14,958)	(5,107)
Investing Activities
Proceeds from maturities of short-term investments		48,274	13,937
Purchase of investments		(39,596)	(12,936)
Purchases of property and equipment		(15)	(198)
Net cash flows provided by investing activities		8,663	803
Financing Activities
Payments for the redemption of redeemable convertible notes			(5,082)
Issuance of common stock for secondary public offering, net of issuance costs			106,761
Issuance of common stock from stock grants and option exercises		106
Proceeds from exercise of warrants			9,545
Net cash flow provided by financing activities		106	111,224
Net increase (decrease) in cash, cash equivalents and restricted cash		(6,189)	106,920
Cash, cash equivalents and restricted cash at beginning of the period		31,263	19,805
Cash, cash equivalents and restricted cash at end of the period	[1]	25,074	126,725
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Adoption of ASC 606			207
Conversion of redeemable convertible notes to common stock			3
Unrealized gain on investments		17	$ 4
Right-of-use asset and operating lease liability recorded upon the adoption of ASC 842, net		$ 2,052

[1] The following table provides a reconciliation of cash and restricted cash to amounts reported within the condensed consolidated balance sheets:

XML

Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019		Dec. 31, 2018	Mar. 31, 2018		Dec. 31, 2017
Statement Of Cash Flows [Abstract]
Cash and cash equivalents	$ 25,024		$ 31,213	$ 126,550
Restricted cash	50		50	175
Total cash and restricted cash	$ 25,074	[1]	$ 31,263	$ 126,725	[1]	$ 19,805

[1] The following table provides a reconciliation of cash and restricted cash to amounts reported within the condensed consolidated balance sheets:

XML

Nature of Operations and Liquidity

3 Months Ended

Mar. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Nature of Operations and Liquidity

1. Nature of Operations and Liquidity

Catalyst Biosciences, Inc. and its subsidiary (the “Company” or “Catalyst”) is a clinical-stage biopharmaceutical company focused on developing novel treatments for hemophilia and other rare bleeding disorders using our engineered subcutaneous (SQ) coagulation factors that promote blood clotting. Our facilities are located in South San Francisco, California and we operate in one segment. Prior to August 20, 2015, the name of the Company was Targacept, Inc. (“Targacept”). On August 20, 2015, Targacept completed its business combination with Catalyst.

The Company had a net loss of $15.1 million for the quarter ended March 31, 2019 and an accumulated deficit of $218.4 million as of March 31, 2019 and expects to continue to incur losses for the next several years. As of March 31, 2019, we had $105.3 million of cash, cash equivalents and short-term investments. Our primary uses of cash are to fund operating expenses, including research and development expenditures and general and administrative expenditures. Based on the current status of its research and development plans, the Company believes that its existing cash, cash equivalents and short-term investments as of March 31, 2019 will be sufficient to fund its cash requirements for at least the next 12 months from the date of the filing of this quarterly report. If, at any time, the Company’s prospects for financing its research and development programs decline, the Company may decide to reduce research and development expenses by delaying, discontinuing or reducing its funding of one or more of its research or development programs. Alternatively, the Company might raise funds through strategic collaborations, public or private financings or other arrangements. Such funding, if needed, may not be available on favorable terms, or at all.  

XML

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of Presentation

The Company’s condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and following the requirements of the Securities and Exchange Commission (the “SEC”) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by U.S. GAAP can be condensed or omitted. These financial statements have been prepared on the same basis as the Company’s annual financial statements and, in the opinion of management, reflect all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair presentation of the Company’s financial information. These interim results and cash flows for any interim period are not necessarily indicative of the results to be expected for the full year.

The accompanying condensed consolidated financial statements and related financial information should be read in conjunction with the consolidated financial statements filed with the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (“Annual Report”).

Accounting Pronouncements Recently Adopted

The Company’s significant accounting policies are included in “Part II - Item 8 - Financial Statements and Supplementary Data - Note 3 – Summary of Significant Accounting Policies” in the Company’s Annual Report. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), to enhance the transparency and comparability of financial reporting related to leasing arrangements. The Company adopted the standard effective January 1, 2019. As discussed in our Annual Report, the Company adopted the new lease standards in the first quarter of 2019. There have been no other significant changes to these accounting policies during the first three months of 2019.

At the inception of an arrangement, the Company determines whether the arrangement is or contains a lease based on the unique facts and circumstances present. Operating lease liabilities and their corresponding right-of-use assets are recorded based on the present value of lease payments over the expected lease term. The interest rate implicit in lease contracts is typically not readily determinable. As such, the Company utilizes its incremental borrowing rate, which is the rate incurred to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. Certain adjustments to the right-of-use asset may be required for items such as initial direct costs paid or incentives received.

The Company has elected to combine lease and non-lease components as a single component. The lease expense is recognized over the expected term on a straight-line basis. Operating leases are recognized on the balance sheet as right-of-use assets, operating lease liabilities, current and operating lease liabilities, non-current. As a result, the Company no longer recognizes deferred rent on the balance sheet.

On January 1, 2019, the Company adopted the new lease accounting standard using the optional transition method under which comparative financial information is not restated and continues to apply the provisions of the previous lease accounting standard in its financial disclosures for the comparative periods. The Company also elected relevant optional practical expedients including 1) did not reassess whether expired or existing contracts are or contain a lease, 2) did not reassess the lease classifications or reassess the initial direct costs associated with expired or existing leases, and 3) did not separate lease and non-lease components of its operating leases in which it is the lessee.

The adoption of the new lease accounting standard had an impact of approximately $2.1 million on the Company's assets and liabilities and had no impact on cash provided by or used in operating, investing or financing activities on the Company's condensed consolidated statements of cash flows. The adoption of the new lease accounting standard did not impact previously reported financial results.

XML

Fair Value Measurements

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

3. Fair Value Measurements

For a description of the fair value hierarchy and the Company’s fair value methodology, see “Part II - Item 8 - Financial Statements and Supplementary Data - Note 2 – Summary of Significant Accounting Policies” in the Company’s Annual Report. There were no significant changes in these methodologies during the three months ended March 31, 2019.

There were no transfers in or out of Level 1 or 2 during the periods presented. The following tables present the fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of March 31, 2019 and December 31, 2018 (in thousands):

	March 31, 2019
	Level 1		Level 2		Level 3		Total
Financial assets:
Money market funds(1)	$	23,475	$	—	$	—	$	23,475
U.S. government agency securities(2)		65,653				—		65,653
Federal agency securities(2)		—		14,600		—		14,600
Restricted cash (money market funds)		50		—		—		50
Total financial assets	$	89,178	$	14,600	$	—	$	103,778

(1) Included in cash and cash equivalents on accompanying condensed consolidated balance sheets.

(2) Included in short-term investments on accompanying condensed consolidated balance sheets and are classified as available-for-sale securities.

	December 31, 2018
	Level 1		Level 2		Level 3		Total
Financial assets:
Money market funds(1)	$	29,090	$	—	$	—	$	29,090
Federal agency securities(1)		—		999		—		999
U.S. Treasury securities(2)		74,139						74,139
Federal agency securities(2)				14,775		—		14,775
Restricted cash (money market funds)		50		—		—		50
Total financial assets	$	103,279	$	15,774	$	—	$	119,053

(1) Included in cash and cash equivalents on accompanying condensed consolidated balance sheets.

(2) Included in short-term investments on accompanying condensed consolidated balance sheets and are classified as available-for-sale securities.

XML

Financial Instruments

3 Months Ended

Mar. 31, 2019

Investments All Other Investments [Abstract]

Financial Instruments

4. Financial Instruments

Cash equivalents, restricted cash and short-term investments (debt securities) which are classified as available-for-sale securities, consisted of the following (in thousands):

March 31, 2019	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds (cash equivalents)	$	23,475	$	—	$	—		$	23,475
U.S. government agency securities		65,645		9		(1	)		65,653
Federal agency securities		14,595		5		—			14,600
Restricted cash (money market funds)		50		—		—			50
Total financial assets	$	103,765	$	14	$	(1	)	$	103,778
Classified as:
Cash and cash equivalents								$	23,475
Short-term investments									80,253
Restricted cash (money market funds)									50
								$	103,778

December 31, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds (cash equivalents)	$	29,090	$	—	$	—		$	29,090
Federal agency securities (cash equivalents)		999		—		—			999
Restricted cash (money market funds)		50		—		—			50
U.S. government agency securities		74,144		1		(6	)		74,139
Agency securities		14,774		1		—			14,775
Total financial assets	$	119,057	$	2	$	(6	)	$	119,053
Classified as:
Cash and cash equivalents								$	30,089
Short-term investments									88,914
Restricted cash (money market funds)									50
								$	119,053

There have been no material realized gains or losses on available-for-sale securities for the periods presented. The carrying amounts of cash, accounts payable, and other payables approximate their fair values due to the short-term maturity of these instruments. As of March 31, 2019, the remaining contractual maturities of available-for-sale securities was less than one year.

XML

Lease

3 Months Ended

Mar. 31, 2019

Lessee Disclosure [Abstract]

Lease

5. Lease

The Company leases office space for its corporate headquarters, located in South San Francisco, CA. The lease term is through April 30, 2023 and there are no stated renewal options. Operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term. In calculating the present value of the lease payments, the Company has elected to utilize its incremental borrowing rate based on the original lease term and not the remaining lease term. The lease includes non-lease components (e.g., common area maintenance) that are paid separately from rent based on actual costs incurred and therefore were not included in the right-of-use asset and liability but are reflected as an expense in the period incurred.

For the three months ended March 31, 2019, the Company’s operating lease expense was $0.2 million. The present value assumptions used in calculating the present value of the lease payments were as follows:

Weighted-average remaining lease term	4.1 years
Weighted-average discount rate		6.0	%

Future lease payments under non-cancelable leases as of March 31, 2019 were as follows:

Remaining in 2019	$	423
2020		578
2021		596
2022		613
2023		209
Total future minimum lease payments		2,419
Less imputed interest		(283	)
Total lease liability	$	2,136

XML

Stock Based Compensation

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Based Compensation

6. Stock Based Compensation

The following table summarizes stock option activity under the Company’s equity incentive plans and related information:

	Number of Shares Underlying Outstanding Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)
Outstanding — December 31, 2018		1,361,977		$	12.04		8.71
Options granted		309,300		$	8.12
Options exercised		(12,794	)	$	4.60
Options forfeited		(39,971	)	$	7.60
Options Expired		(5,641	)	$	91.79
Outstanding — March 31, 2019		1,612,871		$	11.17		8.77
Exercisable — March 31, 2019		468,193		$	16.19		8.03
Vested and expected to vest — March 31, 2019		1,612,871		$	11.17		8.77

Valuation Assumptions

The Company estimated the fair value of stock options granted using the Black-Scholes option-pricing formula and a single option award approach. Due to its limited history as a public company and limited number of sales of its common stock, the Company estimated its volatility considering a number of factors including the use of the volatility of comparable public companies. The expected term of options granted under the Plan, all of which qualify as “plain vanilla” per SEC Staff Accounting Bulletin 107, is determined based on the simplified method due to the Company’s limited operating history and is 6.03 years based on the average between the vesting period and the contractual life of the option. The risk-free rate is based on the yield of a U.S. Treasury security with a term consistent with the option. This fair value is being amortized ratably over the requisite service periods of the awards, which is generally the vesting period.

The fair value of employee stock options was estimated using the following weighted-average assumptions for the three months ended March 31, 2019 and 2018:

	Three Months Ended March 31,
	2019			2018
Employee Stock Options:
Risk-free interest rate		2.56	%		2.40	%
Expected term (in years)		6.03			6.01
Dividend yield		—			—
Volatility		82.91	%		109.32	%
Weighted-average fair value of stock options granted	$	5.80		$	12.34

Total stock-based compensation recognized was as follows (in thousands):

	Three Months Ended March 31,
	2019		2018
Research and development	$	238	$	115
General and administrative(1)		591		491
Total stock-based compensation	$	829	$	606

(1) 2018 includes $0.1 million in modification stock-based compensation expense related to a Board member’s departure.

As of March 31, 2019, 1,031,456 shares of common stock were available for future grant and 1,612,871 options to purchase shares of common stock were outstanding. As of March 31, 2019, the Company had unrecognized employee stock-based compensation expense of $7.4 million, related to unvested stock awards, which is expected to be recognized over an estimated weighted-average period of 2.93 years.

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Collaborations

3 Months Ended

Mar. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Collaborations

7. Collaborations

Pfizer

Pursuant to the termination agreement entered into on December 8, 2016, in connection with the termination of a prior license and development agreement, Pfizer granted the Company an exclusive license to Pfizer’s proprietary rights for manufacturing materials and processes that apply to Factor VIIa variants, CB 813a and marzeptacog alfa (activated) - MarzAA. Pfizer also transferred to the Company the IND application and documentation related to the development, manufacturing and testing of the Factor VIIa products as well as the orphan drug designation. The Company agreed to make contingent cash payments to Pfizer in an aggregate amount equal to up to $17.5 million, payable upon the achievement of clinical, regulatory and commercial milestones. Following commercialization of any covered product, Pfizer will also receive a single-digit royalty on net product sales on a country-by-country basis for a predefined royalty term. In February 2018, the Company paid Pfizer a $1 million milestone payment based on the dosing of the first patient in its ongoing Phase 2 study; the amount was recorded as a research and development expense. No payments were made to Pfizer in the first quarter of 2019.

ISU Abxis

In December 2018, the Company entered into an amended and restated license agreement with ISU Abxis (the “A&R ISU Abxis Agreement”), which amended and restated its previous license and collaboration agreement with ISU Abxis previously entered into in September 2013, as subsequently amended in October 2014 and December 2016 (the “Original ISU Abxis Agreement”). Under the A&R ISU Abxis Agreement, ISU Abxis will receive commercialization rights in South Korea to our engineered Factor IX dalcinonacog alfa - DalcA and the Company will receive clinical development and commercialization rights in the rest of world (excluding South Korea) and manufacturing development and manufacturing rights worldwide (including South Korea). The A&R ISU Abxis Agreement eliminates the profit-sharing arrangement in the Original ISU Abxis Agreement and provides for a low single-digit royalty payment to ISU Abxis, on a country-by-country basis, for net product sales of DalcA by the Company or its affiliates in each country other than South Korea. Pursuant to the A&R ISU Abxis Agreement, the Company will also pay up to an aggregate of $19.5 million in milestone payments to ISU Abxis, including $2.5 million in regulatory and development milestone payments and up to $17 million in commercial milestone payments, if the applicable milestones are met.

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Net Loss per Share Attributable to Common Stockholders

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Net Loss per Share Attributable to Common Stockholders

8. Net Loss per Share Attributable to Common Stockholders

The following table sets forth the computation of the basic and diluted net loss per common share during the three months ended March 31, 2019 and 2018 (in thousands, except share and per share data):

	Three Months Ended March 31,
	2019			2018
Net loss attributable to common stockholders	$	(15,083	)	$	(5,042	)
Weighted-average number of shares used in computing net loss per    share, basic and diluted		11,963,586			8,989,669
Net loss available for common stockholders per share, basic and    diluted	$	(1.26	)	$	(0.56	)

Since the Company was in a loss position for all periods presented, diluted net loss per share is the same as basic net loss per share for all periods as the inclusion of all potential common shares outstanding would have been anti-dilutive. Potentially dilutive securities on an as-if converted basis that were not included in the diluted per share calculations because they would be anti-dilutive were as follows:

	Three Months Ended March 31,
	2019		2018
Options to purchase common stock		1,612,871		1,026,393
Common stock warrants		10,194		12,039
Redeemable convertible notes		—		—
Total		1,623,065		1,038,432

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Stockholders' Equity

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Stockholders' Equity

9. Stockholders’ Equity

February 2018 Underwritten Public Offering — On February 13, 2018, the Company entered into an underwriting agreement with JonesTrading, in connection with a registered firm commitment underwritten public offering of 2,941,176 shares of common stock, pursuant to a shelf registration statement that was declared effective by the SEC on February 6, 2018. On February 15, 2018, the Company sold 3,382,352 shares of common stock (including 441,176 shares of common stock sold pursuant to the exercise of the underwriters’ overallotment option) at a price to the public of $34.00 per share. The net proceeds to the Company, after deducting the underwriting discounts and commissions and offering expenses payable by the Company were approximately $106.8 million.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

10. Commitments and Contingencies

Manufacturing Agreements

On May 20, 2016, the Company signed a development and manufacturing services agreement with AGC Biologics, Inc. (“AGC”), formerly known as CMC ICOS Biologics, Inc., pursuant to which AGC will conduct manufacturing development of agreed upon product candidates. The Company currently has firm work orders with AGC to manufacture MarzAA and DalcA to support its clinical trials totaling $9.4 million and the payment obligations remaining at March 31, 2019 was $4.6 million.

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Related Parties

3 Months Ended

Mar. 31, 2019

Related Party Transactions [Abstract]

Related Parties

11. Related Parties

On October 24, 2017 the Company announced a strategic research collaboration with Mosaic Biosciences, Inc. (“Mosaic”) to develop intravitreal anti-complement factor 3 products for the treatment of dry age-related macular degeneration and other retinal diseases. According to the agreement the Company and Mosaic will co-fund the research. Dr. Usman, our Chief Executive Officer and a member of our board of directors, and Mr. Lawlor, the chairman of our board of directors, were also members of the board of directors of Mosaic when this agreement was entered in to, and the agreement was reviewed by disinterested members of our board of directors and approved by our audit committee. Expenses related to the collaboration were $0.3 and $0.2 million for the three months ended March 31, 2019 and 2018, respectively.

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Interest and Other Income

3 Months Ended

Mar. 31, 2019

Other Income And Expenses [Abstract]

Interest and Other Income

12. Interest and Other Income

The following table shows the detail of interest and other income/(expense), net for the three-month periods ended March 31, 2019 and 2018 (in thousands):

	Three Months Ended March 31,
	2019		2018
Interest income	$	631	$	285
Loss on disposal of fixed assets		—		(116	)
Other income, net		—		1,468
Total other income/(expense), net	$	631	$	1,637

Other income of $1.5 million for the three months ended March 31, 2018, reflects milestone payments received under an agreement associated with neuronal nicotinic receptor assets sold in 2016.

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The Company’s condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and following the requirements of the Securities and Exchange Commission (the “SEC”) for interim reporting. As permitted under those rules, certain footnotes or other financial information that are normally required by U.S. GAAP can be condensed or omitted. These financial statements have been prepared on the same basis as the Company’s annual financial statements and, in the opinion of management, reflect all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair presentation of the Company’s financial information. These interim results and cash flows for any interim period are not necessarily indicative of the results to be expected for the full year.

The accompanying condensed consolidated financial statements and related financial information should be read in conjunction with the consolidated financial statements filed with the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (“Annual Report”).

Accounting Pronouncements Recently Adopted

Accounting Pronouncements Recently Adopted

The Company’s significant accounting policies are included in “Part II - Item 8 - Financial Statements and Supplementary Data - Note 3 – Summary of Significant Accounting Policies” in the Company’s Annual Report. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), to enhance the transparency and comparability of financial reporting related to leasing arrangements. The Company adopted the standard effective January 1, 2019. As discussed in our Annual Report, the Company adopted the new lease standards in the first quarter of 2019. There have been no other significant changes to these accounting policies during the first three months of 2019.

At the inception of an arrangement, the Company determines whether the arrangement is or contains a lease based on the unique facts and circumstances present. Operating lease liabilities and their corresponding right-of-use assets are recorded based on the present value of lease payments over the expected lease term. The interest rate implicit in lease contracts is typically not readily determinable. As such, the Company utilizes its incremental borrowing rate, which is the rate incurred to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. Certain adjustments to the right-of-use asset may be required for items such as initial direct costs paid or incentives received.

The Company has elected to combine lease and non-lease components as a single component. The lease expense is recognized over the expected term on a straight-line basis. Operating leases are recognized on the balance sheet as right-of-use assets, operating lease liabilities, current and operating lease liabilities, non-current. As a result, the Company no longer recognizes deferred rent on the balance sheet.

On January 1, 2019, the Company adopted the new lease accounting standard using the optional transition method under which comparative financial information is not restated and continues to apply the provisions of the previous lease accounting standard in its financial disclosures for the comparative periods. The Company also elected relevant optional practical expedients including 1) did not reassess whether expired or existing contracts are or contain a lease, 2) did not reassess the lease classifications or reassess the initial direct costs associated with expired or existing leases, and 3) did not separate lease and non-lease components of its operating leases in which it is the lessee.

The adoption of the new lease accounting standard had an impact of approximately $2.1 million on the Company's assets and liabilities and had no impact on cash provided by or used in operating, investing or financing activities on the Company's condensed consolidated statements of cash flows. The adoption of the new lease accounting standard did not impact previously reported financial results.

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

There were no transfers in or out of Level 1 or 2 during the periods presented. The following tables present the fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of March 31, 2019 and December 31, 2018 (in thousands):

	March 31, 2019
	Level 1		Level 2		Level 3		Total
Financial assets:
Money market funds(1)	$	23,475	$	—	$	—	$	23,475
U.S. government agency securities(2)		65,653				—		65,653
Federal agency securities(2)		—		14,600		—		14,600
Restricted cash (money market funds)		50		—		—		50
Total financial assets	$	89,178	$	14,600	$	—	$	103,778

(1) Included in cash and cash equivalents on accompanying condensed consolidated balance sheets.

(2) Included in short-term investments on accompanying condensed consolidated balance sheets and are classified as available-for-sale securities.

	December 31, 2018
	Level 1		Level 2		Level 3		Total
Financial assets:
Money market funds(1)	$	29,090	$	—	$	—	$	29,090
Federal agency securities(1)		—		999		—		999
U.S. Treasury securities(2)		74,139						74,139
Federal agency securities(2)				14,775		—		14,775
Restricted cash (money market funds)		50		—		—		50
Total financial assets	$	103,279	$	15,774	$	—	$	119,053

(1) Included in cash and cash equivalents on accompanying condensed consolidated balance sheets.

(2) Included in short-term investments on accompanying condensed consolidated balance sheets and are classified as available-for-sale securities.

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Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Investments All Other Investments [Abstract]

Cash Equivalents, Restricted Cash and Short-Term Investments Classified as Available-for-sale Securities

Cash equivalents, restricted cash and short-term investments (debt securities) which are classified as available-for-sale securities, consisted of the following (in thousands):

March 31, 2019	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds (cash equivalents)	$	23,475	$	—	$	—		$	23,475
U.S. government agency securities		65,645		9		(1	)		65,653
Federal agency securities		14,595		5		—			14,600
Restricted cash (money market funds)		50		—		—			50
Total financial assets	$	103,765	$	14	$	(1	)	$	103,778
Classified as:
Cash and cash equivalents								$	23,475
Short-term investments									80,253
Restricted cash (money market funds)									50
								$	103,778

December 31, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds (cash equivalents)	$	29,090	$	—	$	—		$	29,090
Federal agency securities (cash equivalents)		999		—		—			999
Restricted cash (money market funds)		50		—		—			50
U.S. government agency securities		74,144		1		(6	)		74,139
Agency securities		14,774		1		—			14,775
Total financial assets	$	119,057	$	2	$	(6	)	$	119,053
Classified as:
Cash and cash equivalents								$	30,089
Short-term investments									88,914
Restricted cash (money market funds)									50
								$	119,053

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Lease (Tables)

3 Months Ended

Mar. 31, 2019

Lessee Disclosure [Abstract]

Summary of Present Value Assumptions used in Calculating Present Value of Lease Payments

The present value assumptions used in calculating the present value of the lease payments were as follows:

Weighted-average remaining lease term	4.1 years
Weighted-average discount rate		6.0	%

Summary of Future Lease Payments under Non-cancelable Leases

Future lease payments under non-cancelable leases as of March 31, 2019 were as follows:

Remaining in 2019	$	423
2020		578
2021		596
2022		613
2023		209
Total future minimum lease payments		2,419
Less imputed interest		(283	)
Total lease liability	$	2,136

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Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Option Activity Under Company's Equity Incentive Plans

The following table summarizes stock option activity under the Company’s equity incentive plans and related information:

	Number of Shares Underlying Outstanding Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)
Outstanding — December 31, 2018		1,361,977		$	12.04		8.71
Options granted		309,300		$	8.12
Options exercised		(12,794	)	$	4.60
Options forfeited		(39,971	)	$	7.60
Options Expired		(5,641	)	$	91.79
Outstanding — March 31, 2019		1,612,871		$	11.17		8.77
Exercisable — March 31, 2019		468,193		$	16.19		8.03
Vested and expected to vest — March 31, 2019		1,612,871		$	11.17		8.77

Summary of Weighted Average Valuation Assumptions Used to Estimate Fair Value of Employee Stock Options

The fair value of employee stock options was estimated using the following weighted-average assumptions for the three months ended March 31, 2019 and 2018:

	Three Months Ended March 31,
	2019			2018
Employee Stock Options:
Risk-free interest rate		2.56	%		2.40	%
Expected term (in years)		6.03			6.01
Dividend yield		—			—
Volatility		82.91	%		109.32	%
Weighted-average fair value of stock options granted	$	5.80		$	12.34

Summary of Stock-Based Compensation Recognized

Total stock-based compensation recognized was as follows (in thousands):

	Three Months Ended March 31,
	2019		2018
Research and development	$	238	$	115
General and administrative(1)		591		491
Total stock-based compensation	$	829	$	606

(1) 2018 includes $0.1 million in modification stock-based compensation expense related to a Board member’s departure.

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Net Loss per Share Attributable to Common Stockholders (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Basic and Diluted Net Loss Per Common Share

The following table sets forth the computation of the basic and diluted net loss per common share during the three months ended March 31, 2019 and 2018 (in thousands, except share and per share data):

	Three Months Ended March 31,
	2019			2018
Net loss attributable to common stockholders	$	(15,083	)	$	(5,042	)
Weighted-average number of shares used in computing net loss per    share, basic and diluted		11,963,586			8,989,669
Net loss available for common stockholders per share, basic and    diluted	$	(1.26	)	$	(0.56	)

Anti-dilutive Security not Included In Diluted per Share Calculations

Since the Company was in a loss position for all periods presented, diluted net loss per share is the same as basic net loss per share for all periods as the inclusion of all potential common shares outstanding would have been anti-dilutive. Potentially dilutive securities on an as-if converted basis that were not included in the diluted per share calculations because they would be anti-dilutive were as follows:

	Three Months Ended March 31,
	2019		2018
Options to purchase common stock		1,612,871		1,026,393
Common stock warrants		10,194		12,039
Redeemable convertible notes		—		—
Total		1,623,065		1,038,432

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Interest and Other Income (Tables)

3 Months Ended

Mar. 31, 2019

Other Income And Expenses [Abstract]

Detail of Interest and Other Income/(Expense), Net

The following table shows the detail of interest and other income/(expense), net for the three-month periods ended March 31, 2019 and 2018 (in thousands):

	Three Months Ended March 31,
	2019		2018
Interest income	$	631	$	285
Loss on disposal of fixed assets		—		(116	)
Other income, net		—		1,468
Total other income/(expense), net	$	631	$	1,637

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Nature of Operations - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Segment	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Accounting Policies [Abstract]
Number of operating segment | Segment	1
Net loss	$ 15,083	$ 5,042
Accumulated deficit	218,425		$ 203,342
Cash, cash equivalents, and short-term investments	$ 105,300

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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Accounting Standards Update 2016-02 Leases (Topic 842)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Impact of new lease accounting standard on assets and liabilities	$ 2.1

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Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value		$ 103,778	$ 119,053
Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	[1]	23,475	29,090
Restricted cash (money market funds)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value		50	50
U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	[2]	65,653
Federal Agency Securities | Short-Term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	[2]	14,600	14,775
Federal Agency Securities | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	[1]		999
US Treasury Securities | Short-Term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	[2]		74,139
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value		89,178	103,279
Fair Value, Inputs, Level 1 | Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	[1]	23,475	29,090
Fair Value, Inputs, Level 1 | Restricted cash (money market funds)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value		50	50
Fair Value, Inputs, Level 1 | U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	[2]	65,653
Fair Value, Inputs, Level 1 | US Treasury Securities | Short-Term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	[2]		74,139
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value		14,600	15,774
Fair Value, Inputs, Level 2 | Federal Agency Securities | Short-Term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	[2]	$ 14,600	14,775
Fair Value, Inputs, Level 2 | Federal Agency Securities | Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	[1]		$ 999

[1] Included in cash and cash equivalents on accompanying condensed consolidated balance sheets.

[2] Included in short-term investments on accompanying condensed consolidated balance sheets and are classified as available-for-sale securities.

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Cash Equivalents, Restricted Cash and Short-Term Investments Classified as Available-for-sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 103,765	$ 119,057
Gross Unrealized Gains	14	2
Gross Unrealized Losses	(1)	(6)
Estimated Fair Value	103,778	119,053
Money Market Funds | Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,475	29,090
Estimated Fair Value	23,475	29,090
Money Market Funds | Restricted cash
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	50	50
Estimated Fair Value	50	50
U.S. Government Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	65,645	74,144
Gross Unrealized Gains	9	1
Gross Unrealized Losses	(1)	(6)
Estimated Fair Value	65,653	74,139
Cash and Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	23,475	30,089
Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	80,253	88,914
Federal Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,595
Gross Unrealized Gains	5
Estimated Fair Value	$ 14,600
Federal Agency Securities | Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		999
Estimated Fair Value		999
Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		14,774
Gross Unrealized Gains		1
Estimated Fair Value		$ 14,775

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Financial Instruments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019 USD ($)
Financial Instrument [Line Items]
Material realized gains or losses on available-for-sale securities	$ 0
Maximum
Financial Instrument [Line Items]
Available for sale securities contractual maturities	1 year

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Lease - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee Disclosure [Abstract]
Lease expiration date	Apr. 30, 2023
Lessee operating lease renewal term description	no stated renewal options
Operating lease expense	$ 0.2

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Summary of Present Value Assumptions used in Calculating Present Value of Lease Payments (Detail)	Mar. 31, 2019
Lessee Disclosure [Abstract]
Weighted-average remaining lease term	4 years 1 month 6 days
Weighted-average discount rate	6.00%

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Summary of Future Lease Payments under Non-cancelable Leases (Detail)	Mar. 31, 2019 USD ($)
Operating Lease Liabilities Payments Due [Abstract]
Remaining in 2019	$ 423
2020	578
2021	596
2022	613
2023	209
Total future minimum lease payments	2,419
Less imputed interest	(283)
Total lease liability	$ 2,136

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Summary of Option Activity Under Company's Equity Incentive Plans (Detail) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Number of Shares Underlying Outstanding Options
Number of Shares Underlying Outstanding Options, Beginning Balance	1,361,977
Number of Shares Underlying Outstanding Options, Options granted	309,300
Number of Shares Underlying Outstanding Options, Options exercised	(12,794)
Number of Shares Underlying Outstanding Options, Options forfeited	(39,971)
Number of Shares Underlying Outstanding Options, Options Expired	(5,641)
Number of Shares Underlying Outstanding Options, Ending Balance	1,612,871	1,361,977
Number of Shares Underlying Outstanding Options, Exercisable - March 31, 2019	468,193
Number of Shares Underlying Outstanding Options, Vested and expected to vest - March 31, 2019	1,612,871
Weighted- Average Exercise Price
Weighted- Average Exercise Price, Beginning Balance	$ 12.04
Weighted- Average Exercise Price, Options granted	8.12
Weighted- Average Exercise Price, Options exercised	4.60
Weighted- Average Exercise Price, Options forfeited	7.60
Weighted- Average Exercise Price, Options Expired	91.79
Weighted- Average Exercise Price, Ending Balance	11.17	$ 12.04
Weighted- Average Exercise Price, Exercisable - March 31, 2019	16.19
Weighted- Average Exercise Price, Vested and expected to vest - March 31, 2019	$ 11.17
Weighted-Average Remaining Contractual Term (Years)
Weighted-Average Remaining Contractual Term (Years), Outstanding Balance	8 years 9 months 7 days	8 years 8 months 15 days
Weighted-Average Remaining Contractual Term (Years), Exercisable - March 31, 2019	8 years 10 days
Weighted-Average Remaining Contractual Term (Years), Vested and expected to vest - March 31, 2019	8 years 9 months 7 days

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Stock Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock available for future grant	1,031,456
Shares remaining outstanding	1,612,871
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term of stock options	6 years 10 days	6 years 3 days
Unrecognized employee stock based compensation expense	$ 7.4
Unrecognized employee stock based compensation expense, period for recognition	2 years 11 months 4 days

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Fair Values of Stock Options Estimated Using Black-Scholes Valuation Model (Detail) - Employee Stock Option - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Black Scholes Method Used [Line Items]
Risk-free interest rate	2.56%	2.40%
Expected term (in years)	6 years 10 days	6 years 3 days
Dividend yield	0.00%	0.00%
Volatility	82.91%	109.32%
Weighted-average fair value of stock options granted	$ 5.80	$ 12.34

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Summary of Stock-Based Compensation Recognized (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation		$ 829	$ 606
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation		238	115
General and Administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	[1]	$ 591	$ 491

[1] 2018 includes $0.1 million in modification stock-based compensation expense related to a Board member’s departure.

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Summary of Stock-Based Compensation Recognized (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 829	$ 606
Board Member's Departure
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense		$ 100

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Collaborations - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended
	Dec. 31, 2018	Feb. 28, 2018	Mar. 31, 2019	Dec. 08, 2016
Pfizer Inc | Collaboration Agreement
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Milestone payment		$ 1,000,000	$ 0
Pfizer Inc | Collaboration Agreement | Maximum
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Contingent cash payments upon achievement of clinical, regulatory and commercial milestones				$ 17,500,000
ISU Abxis | Amended and Restated License Agreement
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Regulatory and development milestone payment	$ 2,500,000
ISU Abxis | Amended and Restated License Agreement | Maximum
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Milestone payment	19,500,000
Commercial milestone payments	$ 17,000,000

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Basic and Diluted Net Loss Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net loss attributable to common stockholders	$ (15,083)	$ (5,042)
Weighted-average number of shares used in computing net loss per share, basic and diluted	11,963,586	8,989,669
Net loss available for common stockholders per share, basic and diluted	$ (1.26)	$ (0.56)

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Anti-dilutive Security not Included In Diluted per Share Calculations (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti dilutive securities	1,623,065	1,038,432
Options To Purchase Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti dilutive securities	1,612,871	1,026,393
Common Stock Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti dilutive securities	10,194	12,039

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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	Feb. 15, 2018	Feb. 13, 2018	Mar. 31, 2018
Stockholders Equity Disclosure [Line Items]
Net proceeds from sale of common stock	$ 106.8
Common Stock
Stockholders Equity Disclosure [Line Items]
Firm commitment underwritten public offering shares		2,941,176
Issuance of stock, shares	3,382,352		3,382,352
Common stock price, per share	$ 34.00
Common Stock | Overallotment Option
Stockholders Equity Disclosure [Line Items]
Issuance of stock, shares	441,176

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Commitments and Contingencies - Additional Information (Detail) - AGC Biologics, Inc - Marzeptacog Alfa Activated and Dalcinonacog Alfa $ in Millions	Mar. 31, 2019 USD ($)
Commitments And Contingencies Disclosure [Line Items]
Clinical trials	$ 9.4
Contractual obligation payments	$ 4.6

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Related Parties - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Mosaic | Strategic Research Collaboration to Develop Intravitreal Anti-Complement Factor 3 Products
Related Party Transaction [Line Items]
Expenses related to collaboration	$ 0.3	$ 0.2

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Detail of Interest and Other Income/(Expense), Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Income And Expenses [Abstract]
Interest income	$ 631	$ 285
Loss on disposal of fixed assets		(116)
Other income, net		1,468
Total other income/(expense), net	$ 631	$ 1,637

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Interest and Other Income - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Other Income And Expenses [Abstract]
Other income reflects milestone payments received	$ 1,468