Document and Entity Information
Document and Entity Information - USD ($) | 12 Months Ended | ||
Dec. 31, 2017 | Feb. 16, 2018 | Jun. 30, 2017 | |
Document And Entity Information [Abstract] | |||
Document Type | 10-K | ||
Amendment Flag | false | ||
Document Period End Date | Dec. 31, 2017 | ||
Document Fiscal Year Focus | 2,017 | ||
Document Fiscal Period Focus | FY | ||
Trading Symbol | GTHX | ||
Entity Registrant Name | G1 THERAPEUTICS, INC. | ||
Entity Central Index Key | 1,560,241 | ||
Current Fiscal Year End Date | --12-31 | ||
Entity Well-known Seasoned Issuer | No | ||
Entity Current Reporting Status | Yes | ||
Entity Voluntary Filers | No | ||
Entity Filer Category | Non-accelerated Filer | ||
Entity Common Stock, Shares Outstanding | 28,444,863 | ||
Entity Public Float | $ 294,068,519 |
Balance Sheets
Balance Sheets - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 |
Current assets | ||
Cash and cash equivalents | $ 103,812 | $ 47,305 |
Prepaid expenses and other current assets | 849 | 596 |
Total current assets | 104,661 | 47,901 |
Property and equipment, net | 510 | 311 |
Total assets | 105,171 | 48,212 |
Current liabilities | ||
Accounts payable | 4,184 | 2,605 |
Accrued expenses | 7,520 | 2,853 |
Warrant liability | 167 | |
Total current liabilities | 11,704 | 5,625 |
Other non-current liabilities | 79 | |
Total liabilities | 11,783 | 5,625 |
Commitments and contingencies | ||
Stockholders’ equity (deficit) | ||
Common stock, $0.0001 par value, 120,000,000 shares and 73,000,000 shares authorized as of December 31, 2017 and December 31, 2016, respectively; 28,420,511 and 1,504,947 shares issued as of December 31, 2017 and December 31, 2016, respectively; 28,393,845 and 1,478,281 shares outstanding as of December 31, 2017 and December 31, 2016, respectively | 3 | |
Treasury stock, 26,666 shares | (8) | (8) |
Additional paid-in capital | 222,511 | |
Accumulated deficit | (129,118) | (64,985) |
Total stockholders’ equity (deficit) | 93,388 | (64,993) |
Total liabilities, mezzanine equity and equity | $ 105,171 | 48,212 |
Series C Redeemable Convertible Preferred Stock | ||
Mezzanine equity | ||
Redeemable convertible preferred stock | 51,424 | |
Series B Redeemable Convertible Preferred Stock | ||
Mezzanine equity | ||
Redeemable convertible preferred stock | 40,355 | |
Series A Redeemable Convertible Preferred Stock | ||
Mezzanine equity | ||
Redeemable convertible preferred stock | 14,431 | |
Series 1 Redeemable Convertible Preferred Stock | ||
Mezzanine equity | ||
Redeemable convertible preferred stock | $ 1,370 |
Balance Sheets (Parenthetical)
Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 |
Common stock, par value | $ 0.0001 | $ 0.0001 |
Common stock, shares authorized | 120,000,000 | 73,000,000 |
Common stock, shares, issued | 28,420,511 | 1,504,947 |
Common stock, shares, outstanding | 28,393,845 | 1,478,281 |
Treasury stock, shares | 26,666 | 26,666 |
Series C Redeemable Convertible Preferred Stock | ||
Preferred stock, par value | $ 0.0001 | $ 0.0001 |
Preferred stock, shares authorized | 0 | 17,000,000 |
Preferred stock, shares issued | 0 | 5,609,398 |
Preferred stock, shares outstanding | 0 | 5,609,398 |
Preferred stock, liquidation preference, value | $ 51,673 | |
Series B Redeemable Convertible Preferred Stock | ||
Preferred stock, par value | $ 0.0001 | $ 0.0001 |
Preferred stock, shares authorized | 0 | 23,000,000 |
Preferred stock, shares issued | 0 | 7,642,734 |
Preferred stock, shares outstanding | 0 | 7,642,734 |
Preferred stock, liquidation preference, value | $ 35,722 | |
Series A Redeemable Convertible Preferred Stock | ||
Preferred stock, par value | $ 0.0001 | $ 0.0001 |
Preferred stock, shares authorized | 0 | 14,996,692 |
Preferred stock, shares issued | 0 | 4,998,895 |
Preferred stock, shares outstanding | 0 | 4,998,895 |
Preferred stock, liquidation preference, value | $ 14,431 | |
Series 1 Redeemable Convertible Preferred Stock | ||
Preferred stock, par value | $ 0.0001 | $ 0.0001 |
Preferred stock, shares authorized | 0 | 2,112,025 |
Preferred stock, shares issued | 0 | 682,026 |
Preferred stock, shares outstanding | 0 | 682,026 |
Preferred stock, liquidation preference, value | $ 931 |
Statements of Operations
Statements of Operations - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | |
Income Statement [Abstract] | |||
Grant revenue | $ 522 | ||
Operating expenses | |||
Research and development | $ 53,881 | $ 25,161 | 12,730 |
General and administrative | 7,087 | 5,230 | 3,216 |
Total operating expenses | 60,968 | 30,391 | 15,946 |
Operating loss | (60,968) | (30,391) | (15,424) |
Other income (expense) | |||
Other income | 888 | 182 | 18 |
Change in fair value in warrant liability and other liabilities | (41) | (82) | (85) |
Change in fair value of Series B purchase option liability | (4,772) | ||
Total other income (expense), net | 847 | 100 | (4,839) |
Net loss | (60,121) | (30,291) | (20,263) |
Accretion of redeemable convertible preferred stock | (4,757) | (4,405) | (1,427) |
Net loss attributable to common stockholders | $ (64,878) | $ (34,696) | $ (21,690) |
Net loss per share attributable to common stockholders, basic and diluted | $ (3.57) | $ (23.33) | $ (16.13) |
Weighted average common shares outstanding, basic and diluted | 18,197,970 | 1,486,986 | 1,344,584 |
Statements of Redeemable Conver
Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Total | Series C Redeemable Convertible Preferred Stock | Series B Redeemable Convertible Preferred Stock | Series B Redeemable Convertible Preferred StockSeries B Purchase Option | Series A Redeemable Convertible Preferred Stock | Series 1 Redeemable Convertible Preferred Stock | Common Stock | Treasury Stock | Additional Paid-in Capital | Accumulated Deficit |
Balance at Dec. 31, 2014 | $ (10,628) | $ (8) | $ 3 | $ (10,623) | ||||||
Temporary equity, balance (in shares) at Dec. 31, 2014 | 4,998,895 | 682,026 | ||||||||
Temporary equity, balance at Dec. 31, 2014 | $ 13,171 | $ 931 | ||||||||
Balance (in shares) at Dec. 31, 2014 | 1,273,831 | (26,666) | ||||||||
Issuance of redeemable convertible preferred stock | $ 33,262 | |||||||||
Issuance of redeemable convertible preferred stock (in shares) | 7,642,734 | |||||||||
Allocation of Series B proceeds to Series B purchase option liability | $ (1,935) | |||||||||
Temporary equity accretion of redeemable, convertible preferred stock | $ 797 | $ 630 | ||||||||
Accretion of redeemable, convertible preferred stock | (1,426) | (626) | (800) | |||||||
Exercise of common stock options | 53 | 53 | ||||||||
Exercise of common stock options (in shares) | 164,722 | |||||||||
Stock-based compensation | 389 | 389 | ||||||||
Stock financing costs | $ (139) | |||||||||
Issuance of common shares for license agreement | 181 | 181 | ||||||||
Issuance of common shares for license agreement (in shares) | 48,666 | |||||||||
Exercise of Series B purchase option liability | $ 6,707 | |||||||||
Net loss during year | (20,263) | (20,263) | ||||||||
Balance at Dec. 31, 2015 | (31,694) | $ (8) | (31,686) | |||||||
Temporary equity, balance (in shares) at Dec. 31, 2015 | 7,642,734 | 4,998,895 | 682,026 | |||||||
Temporary equity, balance at Dec. 31, 2015 | $ 38,692 | $ 13,801 | $ 931 | |||||||
Balance (in shares) at Dec. 31, 2015 | 1,487,219 | (26,666) | ||||||||
Issuance of redeemable convertible preferred stock | $ 50,000 | |||||||||
Issuance of redeemable convertible preferred stock (in shares) | 5,609,398 | |||||||||
Temporary equity accretion of redeemable, convertible preferred stock | $ 1,673 | $ 1,663 | $ 630 | $ 439 | ||||||
Accretion of redeemable, convertible preferred stock | (4,405) | (1,397) | (3,008) | |||||||
Exercise of common stock options | 6 | 6 | ||||||||
Exercise of common stock options (in shares) | 17,728 | |||||||||
Stock-based compensation | 1,391 | 1,391 | ||||||||
Stock financing costs | $ (249) | |||||||||
Net loss during year | (30,291) | (30,291) | ||||||||
Balance at Dec. 31, 2016 | (64,993) | $ (8) | (64,985) | |||||||
Temporary equity, balance (in shares) at Dec. 31, 2016 | 5,609,398 | 7,642,734 | 4,998,895 | 682,026 | ||||||
Temporary equity, balance at Dec. 31, 2016 | $ 51,424 | $ 40,355 | $ 14,431 | $ 1,370 | ||||||
Balance (in shares) at Dec. 31, 2016 | 1,504,947 | (26,666) | ||||||||
Temporary equity accretion of redeemable, convertible preferred stock | 3,732 | 620 | 235 | 171 | ||||||
Accretion of redeemable, convertible preferred stock | (4,757) | (745) | (4,012) | |||||||
Initial public offering | 108,503 | $ 1 | 108,502 | |||||||
Initial public offering (in shares) | 7,781,564,000 | |||||||||
Automatic conversion of preferred stock | 112,337 | $ (55,156) | $ (40,975) | $ (14,666) | $ (1,541) | $ 2 | 112,335 | |||
Automatic conversion of preferred stock, in shares | (5,609,398) | (7,642,734) | (4,998,895) | (682,026) | 18,933,053 | |||||
Automatic conversion of preferred warrants | 208 | 208 | ||||||||
Exercise of common stock options | $ 214 | 214 | ||||||||
Exercise of common stock options (in shares) | 173,035 | 160,579 | ||||||||
Exercise of common stock warrants | $ 1 | 1 | ||||||||
Exercise of common stock warrants, in shares | 40,368 | |||||||||
Stock-based compensation | 3,394 | 3,394 | ||||||||
IPO financing costs | (1,398) | (1,398) | ||||||||
Issuance of common shares for license agreement (in shares) | 3,791,272 | |||||||||
Net loss during year | (60,121) | (60,121) | ||||||||
Balance at Dec. 31, 2017 | $ 93,388 | $ 3 | $ (8) | $ 222,511 | $ (129,118) | |||||
Temporary equity, balance (in shares) at Dec. 31, 2017 | 0 | 0 | 0 | 0 | ||||||
Balance (in shares) at Dec. 31, 2017 | 28,420,511 | (26,666) |
Statements of Cash Flows
Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | |
Cash flows from operating activities | |||
Net loss | $ (60,121) | $ (30,291) | $ (20,263) |
Adjustments to reconcile net loss to net cash used in operating activities | |||
Depreciation and amortization | 89 | 67 | 42 |
Stock-based compensation | 3,394 | 1,391 | 389 |
Purchase of license agreement | 181 | ||
Gain/loss on disposal of property and equipment | 6 | 18 | 2 |
Increase in fair value of warrant activity | 41 | 82 | 85 |
Increase in fair value of Series B purchase option liability | 4,773 | ||
Change in operating assets and liabilities | |||
Prepaid expenses and other assets | (253) | 216 | (789) |
Accounts payable and accrued expenses | 6,325 | 3,376 | 1,735 |
Net cash used in operating activities | (50,519) | (25,141) | (13,845) |
Cash flows from investing activities | |||
Purchases of property and equipment | (294) | (250) | (87) |
Net cash used in investing activities | (294) | (250) | (87) |
Cash flows from financing activities | |||
Proceeds from stock options and warrants exercised | 215 | 7 | 53 |
Issuance costs for preferred share financings | (249) | (140) | |
Proceeds from initial public offering, net of underwriting fees and commissions | 108,503 | ||
Payment of public offering costs | (1,398) | ||
Net cash provided by financing activities | 107,320 | 49,758 | 33,176 |
Net change in cash and cash equivalents | 56,507 | 24,367 | 19,244 |
Cash and cash equivalents | |||
Beginning of period | 47,305 | 22,938 | 3,694 |
End of period | 103,812 | 47,305 | 22,938 |
Non-cash investing and financing activities | |||
Accretion of redeemable convertible preferred stock | 4,757 | 4,405 | 1,427 |
Exercise of Series B purchase option | 6,708 | ||
Common stock issued for patent rights | 181 | ||
Conversion of preferred stock and preferred warrants to common stock and common warrants | $ 112,545 | ||
Series C Preferred Stock | |||
Cash flows from financing activities | |||
Proceeds from preferred stock | $ 50,000 | ||
Series B Preferred Stock | |||
Cash flows from financing activities | |||
Proceeds from preferred stock | $ 33,263 |
Description of Business
Description of Business | 12 Months Ended |
Dec. 31, 2017 | |
Organization Consolidation And Presentation Of Financial Statements [Abstract] | |
Description of Business | 1. Description of business G1 Therapeutics, Inc. (the “Company”) is a privately held clinical-stage biopharmaceutical company based in Research Triangle Park, North Carolina that focuses on the discovery and development of novel therapeutics for the treatment of cancer. The Company was incorporated on May 19, 2008 in the state of Delaware. The Company focuses on cyclin-dependent kinases (CDKs), a family of proteins that plays an important role in the growth and proliferation of all human cells. The Company has focused its CDK research on developing potent and selective inhibitors of the kinases CDK4 and CDK6, collectively known as CDK4/6. The Company is currently advancing two CDK4/6 inhibitor product candidates that each have broad applicability across multiple cancer indications. Trilaciclib, the Company’s most advanced clinical-stage candidate, is a potential first-in-class intravenous CDK4/6 inhibitor designed to preserve hematopoietic stem cells and enhance immune system function during chemotherapy. Based on compelling response rates and favorable tolerability shown in early-stage trials, trilaciclib is currently being evaluated in four randomized Phase 1b/2a trials: two in patients with small cell lung cancer, or SCLC, an additional Phase 2 trial in combination with Tecentriq in SCLC and a Phase 2 in patients with triple-negative breast cancer, or TNBC. G1T38, the Company’s second clinical-stage candidate, is a potential best-in-class oral CDK4/6 inhibitor, to be used in combination with other targeted therapies to treat multiple cancers. A Phase 1 trial of G1T38 in 75 healthy volunteers showed a favorable safety profile, and the Company initiated a Phase 1/2 trial in ER+, HER2- breast cancer in January 2017. The Company’s plans for G1T38 include future combinations in other cancers, such as non-small cell lung cancer, or NSCLC. As part of the Company’s strategy to develop wholly-owned proprietary combinations, the Company has exclusively in-licensed G1T48, a potential first/best-in-class oral selective estrogen receptor degrader, or SERD. The Company expects to initially develop G1T48 to be used in combination with G1T38 for the treatment of ER+, HER2- breast cancer. The Company plans to continue to leverage its proprietary assets and knowledge of CDK4/6 biology to explore additional combination treatments and to build a fully integrated oncology company. The Company’s financial statements have been prepared assuming that the Company will continue as a going concern, which contemplates the realization of assets and the settlement of liabilities and commitments in the normal course of business. As of December 31, 2017, the Company had an accumulated deficit of $129.1 million. The Company has reported a net loss in all fiscal periods since inception and expects to incur substantial losses in the future to conduct research and development and pre-commercialization activities. As of December 31, 2017, the Company had cash and cash equivalents of $103.8 million. The Company expects that its existing cash and cash equivalents will enable it to fund its operating expenses and capital expenditure requirements for greater than 12 months from the date of filing this Annual Report. The failure of the Company to obtain sufficient funds on acceptable terms when needed could have a material adverse effect on the Company’s results of operations and financial condition. |
Summary of Significant Accounti
Summary of Significant Accounting Policies | 12 Months Ended |
Dec. 31, 2017 | |
Accounting Policies [Abstract] | |
Summary of Significant Accounting Policies | 2. Summary of significant accounting policies Basis of presentation The Company has prepared the accompanying financial statements in conformity with generally accepted accounting principles in the United States of America (“U.S. GAAP”). Use of estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and the accompanying notes. Actual results could differ from those estimates. These estimates include the Company’s common stock valuation, warrant valuation and deferred tax asset valuation allowance. Cash and cash equivalents The Company considers all highly liquid investments purchased with an original maturity of three months or less at the date of purchase to be cash equivalents. Cash and cash equivalents at December 31, 2017 consist of amounts on deposit in banks, including checking accounts, money market accounts and certificates of deposit. Cash deposits are all in financial institutions in the United States. Concentration of credit risk Financial instruments that potentially subject the Company to credit risk consist of cash and cash equivalents. Deposits with financial institutions are insured, up to certain limits, by the Federal Deposit Insurance Corporation (“FDIC”). The Company’s cash deposits often exceed the FDIC insurance limit; however, all deposits are maintained with high credit quality institutions and the Company has not experienced any losses in such accounts. The financial condition of financial institutions is periodically reassessed, and the Company believes the risk of any loss is minimal. The Company believes the risk of any loss on cash due to credit risk is minimal. Property and equipment Property and equipment are stated at cost less accumulated depreciation. Depreciation is generally calculated using the straight-line method over the following estimated useful lives: Computer equipment 5 years Laboratory equipment 5 years Furniture and fixtures 7 years Leasehold improvements 7 years Costs associated with maintenance and repairs are charged to expense as incurred. Property and equipment held under leasehold improvements are amortized over the shorter of the lease term or the estimated useful life of the related asset. Impairment of long-lived assets The Company evaluates its long-lived assets for indicators of possible impairment by comparison of the carrying amounts to future net undiscounted cash flows expected to be generated by such assets when events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Should an impairment exist, the impairment loss would be measured based on the excess carrying value of the asset over the asset’s fair value based on discounted estimates of future cash flows. For the years ended December 31, 2017, 2016 and 2015, the Company’s management evaluated its long-lived assets and determined no impairment charge was needed. Warrant liability Warrants to purchase the Company’s redeemable convertible preferred stock have been classified as liabilities and are recorded at their estimated fair value. In each reporting period, any change in fair value of the warrants has been recorded as expense in the case of an increase in fair value and income in the case of a decrease in fair value. Series B purchase option liability The option to purchase shares of Series B redeemable convertible preferred stock in the second tranche has been accounted for as a free-standing instrument and classified as a liability. On February 4, 2015, upon purchase of the first tranche of Series B Preferred Stock, the option to purchase additional shares was recorded at its fair value, with the remaining cash proceeds received on that date allocated to Series B Preferred Stock. As the value of the option to purchase shares in the second tranche increased over time, a change in the fair value of the liability was recorded as “Change in fair value of Series B purchase option liability” in the accompanying statement of operations. This free-standing instrument was exercised on December 10, 2015 when the holders exercised their right to require the purchase of the second tranche shares by the holders of the outstanding shares of Series B Preferred Stock, resulting in an outstanding liability of $0 on December 31, 2016 and 2017. Research and development Research and development expenses consist of costs incurred to further the Company’s research and development activities and include salaries and related employee benefits, manufacturing of pharmaceutical active ingredients and drug products, costs associated with clinical trials, nonclinical activities, regulatory activities, research-related overhead expenses and fees paid to expert consultants, external service providers and contract research organizations which conduct certain research and development activities on behalf of the Company. Costs incurred in the research and development of products are charged to research and development expense as incurred. Each reporting period, the Company estimates and accrues expenses, the largest of which is related to accrued research and development expenses. This process involves reviewing contracts and purchase orders, identifying services that have been performed on the Company’s behalf, and estimating the level of service performed and the associated cost incurred for the service when the Company has not yet been invoiced or otherwise notified of the actual costs. Costs for preclinical studies and clinical trial activities are recognized based on an evaluation of vendors’ progress towards completion of specific tasks, using data such as patient enrollment, clinical site activations or information provided by vendors regarding their actual costs incurred. Payments for these activities are based on the terms of individual contracts and payment timing may differ significantly from the period in which the services were performed. The Company determines accrual estimates through reports from and discussions with applicable personnel and outside service providers as to the progress or state of completion of trials, or the services completed. The estimates of accrued expenses as of each balance sheet date are based on the facts and circumstances known at the time. Revenue recognition The Company received the majority of its revenues from grant programs authorized by Congress through the Small Business Innovation Research (SBIR) program and the Small Business Technology Transfer Act (STTR) of 1992. In addition, the Company was also awarded grant funds through other federal and state programs related to its research. Under the terms of the grants, the Company is entitled to receive reimbursement of its allowable direct expenses, allocated overhead and general and administrative expenses. Revenue received under these grant programs is recognized as direct project costs are incurred, plus a portion of the Company’s indirect costs such as overhead and general and administrative expenses allocated to the project. The Company’s grant agreements are fixed fee arrangements. In the event that the granting agency provides advance funding of a grant award, the Company records deferred revenues and then recognizes revenue as costs are incurred over the life of the grant. To date, the Company has not generated any revenue from the commercial sale of its product candidates. Fair value of financial instruments The Company provides disclosure of financial assets and financial liabilities that are carried at fair value based on the price that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements may be classified based on the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities using the following three levels: Level 1 Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Level 2 Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means. Level 3 Unobservable inputs that reflect the Company’s estimates of the assumptions that market participants would use in pricing the asset or liability. The Company develops these inputs based on the best information available, including its own data. The carrying amounts of cash, cash equivalents, accounts payable and accrued liabilities approximate fair value because of their short-term nature. At December 31, 2017 and 2016 these financials instruments and respective fair values have been classified as follows (in thousands): Quoted prices in active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant other unobservable inputs (Level 3) Balance at December 31, 2017 Assets Money market funds $ 87,694 $ — $ — $ 87,694 Certificates of Deposit 15,203 — — 15,203 Total assets at fair value: $ 102,897 $ — $ — $ 102,897 Liabilities: Warrant Liability $ — $ — $ — $ — Total liabilities at fair value: $ — $ — $ — $ — Quoted prices in active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant other unobservable inputs (Level 3) Balance at December 31, 2016 Assets Money market funds $ 31,730 $ — $ — $ 31,730 Certificates of Deposit 15,041 — — 15,041 Total assets at fair value: $ 46,771 $ — $ — $ 46,771 Liabilities: Warrant Liability $ — $ — $ 167 $ 167 Total liabilities at fair value: $ — $ — $ 167 $ 167 The change in the fair value measurement using significant inputs (Level 3) is summarized below (in thousands): Balance at December 31, 2015 $ 85 Change in fair value in warrant liability 82 Balance at December 31, 2016 $ 167 Change in fair value in warrant liability 41 Conversion of warrant to common stock warrant (208 ) Balance at December 31, 2017 $ — Patent costs Costs associated with the submission of patent applications are expensed as incurred given the uncertainty of the future economic benefits of the patents. Patent-related legal expenses included in general and administrative costs were approximately $997, $1,034, and $691 for the years ended December 31, 2017, 2016 and 2015, respectively. Income taxes Income taxes are accounted for using the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statements carrying amounts of assets and liabilities and their respective tax bases, operating loss carryforwards, and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. In accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 740, Accounting for Income Taxes Stock-based compensation The primary type of stock-based payments utilized by the Company are stock options. The Company accounts for stock-based employee compensation arrangements by measuring the cost of employee services received in exchange for all equity awards granted based on the fair value of the award on the grant date. The fair value of each employee stock option is estimated on the date of grant using an options pricing model. The Company currently uses the Black-Scholes valuation model to estimate the fair value of its share-based payments. The model requires management to make a number of assumptions including expected volatility, expected life, risk-free interest rate and expected dividends. The Company accounts for stock-based non-employee compensation arrangements by recording the expense of such services based on the fair value of the equity instrument as estimated using the Black-Scholes pricing model. The fair value of the equity instrument is charged to operating expense over the term of the service agreement. Segment information The Company manages its operations as a single segment for the purposes of assessing performance and making operating decisions. All of the Company’s assets are held in the United States. Comprehensive loss Comprehensive loss includes net loss as well as other changes in stockholders’ equity (deficit) that result from transactions and economic events other than those with stockholders. There was no difference between net loss and comprehensive loss for each of the periods presented in the accompanying financial statements. Redeemable convertible preferred stock The Company classifies its redeemable convertible preferred stock, for which the Company does not control the redemption, outside of permanent equity. The Company records redeemable convertible preferred stock at fair value upon issuance, net of any offering costs, and the carrying value is adjusted to the redemption value at the end of each reporting period. These adjustments are effected through charges against additional paid-in capital and accumulated deficit. New accounting standards In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718) In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) In May 2014, the FASB and the International Accounting Standards Board jointly issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) |
Property and Equipment
Property and Equipment | 12 Months Ended |
Dec. 31, 2017 | |
Property Plant And Equipment [Abstract] | |
Property and Equipment | 3. Property and equipment Property and equipment consists of the following (in thousands): December 31, 2017 December 31, 2016 Computer equipment $ 112 $ 67 Laboratory equipment 283 207 Furniture and fixtures 174 64 Leasehold improvements 121 80 Construction in progress 1 — Accumulated depreciation (181 ) (107 ) Property and equipment, net $ 510 $ 311 Depreciation expenses relating to property and equipment were $89, $67, and $42 for the years ended December 31, 2017, 2016 and 2015, respectively. |
Patent License Agreement
Patent License Agreement | 12 Months Ended |
Dec. 31, 2017 | |
Patent License Agreement [Abstract] | |
Patent License Agreement | 4. Patent license agreement On November 23, 2016, the Company entered into a license agreement with the Board of Trustees of the University of Illinois (the University) whereby the University licensed patent rights to the Company, with rights of sublicense, to make, have made, use, import, sell and offer for sale products covered by certain patent rights owned by the University. The rights licensed to the Company are exclusive, worldwide, non-transferable rights, for all fields of use. Under the terms of the agreement the Company paid a one-time only, non-refundable license issue fee in the amount of $500 which was charged to research and development expense in the fourth quarter of 2016. The Company is also obligated to pay annual maintenance fees to the University. All annual minimum payments are fully creditable against any royalty payments made by the Company. Under the terms of the agreement, the Company must pay the University a low single-digit royalty percentage on all net sales of products and a share of sublicensing revenues. The University is eligible to receive milestone payments of up to $2,625 related to the initiation and execution of clinical trials and first commercial sale of a product in multiple countries. The Company is also responsible for all future patent prosecution costs. The term of the license agreement will continue until the later of (i) the expiration of the last valid claim within the patent rights covering the product in such country, (ii) the expiration of market exclusivity in such country and (iii) the 10th anniversary of the first commercial sale in such country. The University may terminate the agreement in the event (i) the Company fails to pay any amount or make any report when required to be made and fails to cure such failure within thirty (30) days after receipt of notice from the University, (ii) is in breach of any provision of the agreement and fails to remedy within forty-five (45) days after receipt of notice, (iii) makes a report to the University under the agreement that is determine to be materially false, (iv) declares insolvency or bankruptcy or (v) takes an action that causes patent rights or technical information to be subject to lien or encumbrance and fails to remedy any such breach with in forty-five (45) days of receipt of notice from the University. The Company may terminate the agreement at any time on written notice to the University at least ninety (90) days prior to the termination date specified in the notice. Upon expiration or termination of the agreement, all rights revert to the University. On December 31, 2015 the Company entered into a non-exclusive, royalty-free license agreement for patent rights. As consideration for the patent rights, the Company issued 48,666 shares of common stock with a fair value of $181, and agreed to pay past and future patent prosecution costs related to the countries in which valid claims have or will have issued. The aggregate fair value of all consideration paid was expensed as a research and development cost in 2015. |
Accrued Expenses
Accrued Expenses | 12 Months Ended |
Dec. 31, 2017 | |
Payables And Accruals [Abstract] | |
Accrued Expenses | 5. Accrued expenses Accrued expenses are comprised as follows (in thousands): December 31, 2017 December 31, 2016 Accrued external research and professional fees $ 1,402 $ 295 Accrued external clinical study costs 4,788 1,897 Accrued compensation expense 1,328 617 Deferred rent, current portion 2 44 Accrued expenses $ 7,520 $ 2,853 |
Lease Obligations
Lease Obligations | 12 Months Ended |
Dec. 31, 2017 | |
Leases [Abstract] | |
Lease Obligations | 6. Lease obligations Operating lease commitments Pursuant to a lease dated January 10, 2014, on April 1, 2014, the Company leased office and lab space under a lease agreement for $6 per month with a free rent period and escalating rent payments; the lease was set to expire on July 31, 2017. On January 27, 2016, the Company signed an amendment to the Company’s existing lease to move to a larger office and lab space beginning in August 2016 for $16 per month with a discounted rent period and escalating rent payments; the lease was extended to December 31, 2022. The amendment also contained an option for a five year renewal and a right of first refusal to lease adjacent office space. On March 27, 2017, the Company signed an amendment to the Company’s existing lease to lease additional, adjacent office space. Beginning August 2017, the combined space leased for $24 per month with a discounted rent period and escalating rent payments. The lease is set to expire on December 31, 2022. The Company has maintained an option for a five year renewal on the combined space. Rent expense amounted to $252, $126 and $71 for the years ended December 31, 2017, 2016 and 2015, respectively. The following is a schedule by years of minimum future rental payments on noncancelable operating leases as of December 31, 2017 (in thousands): 2018 $ 294 2019 303 2020 312 2021 321 2022 331 2023 — $ 1,561 |
Capitalization
Capitalization | 12 Months Ended |
Dec. 31, 2017 | |
Capitalization Longterm Debt And Equity [Abstract] | |
Capitalization | 7. Capitalization Redeemable convertible preferred stock The Company has determined that the Series C, Series B, Series A and Series 1 redeemable convertible preferred stock were redeemable, after a stated period of time, based on voting thresholds that vary by shareholder class, as outlined in the Company’s certificate of incorporation. The Company classified its redeemable convertible preferred stock outside of permanent equity and into mezzanine equity. The Company recorded its redeemable convertible preferred stock at fair value upon issuance, net of any issuance costs or discounts, and the carrying value is increased by periodic accretion to its redemption value until the earliest possible date of redemption. These increases were recorded as charges against additional paid-in-capital until the additional paid-in-capital balance is reduced to zero. At that time, additional accretion adjustments were recorded as additions to accumulated deficit. In May 2014, the Company issued 2,495,663 shares of its Series A redeemable convertible preferred stock for cash consideration of $2.52 per share. Total proceeds, including cancellation of indebtedness of $39, amounted to $6,289. In February 2015, the Company’s Board of Directors and stockholders approved the Fourth Amended and Restated Certification of Incorporation, which increased the authorized number of shares of its redeemable convertible preferred stock to 39,908,717, of which 2,112,025 were designated as Series 1 redeemable convertible preferred stock, 14,996,692 as Series A redeemable convertible preferred stock and 22,800,000 as Series B redeemable convertible preferred stock. At the same time, the Company issued 3,794,024 shares of its Series B redeemable convertible preferred stock for cash consideration and cancellation of indebtedness at a price of $4.3521 per share. Total proceeds, including cancellation of indebtedness of $12, amounted to $16,512. In December 2015, the Company approved a Certificate of Amendment to the Fourth Amended and Restated Certification of Incorporation which increased the authorized number of shares of its redeemable convertible preferred stock to 40,108,717, of which 2,112,025 were be designated as Series 1 redeemable convertible preferred stock, 14,996,692 as Series A redeemable convertible preferred stock and 23,000,000 as Series B redeemable convertible preferred stock. At the same time, the Company authorized 11,546,147 shares of its Series B redeemable convertible preferred stock and issued 3,848,710 shares of its Series B redeemable convertible preferred stock for cash consideration at a price of $4.3521 per share. Total additional proceeds amounted to $16,750. In April 2016, the Company’s Board of Directors and stockholders approved the Fifth Amended and Restated Certification of Incorporation which increased the authorized number of shares of its redeemable convertible preferred stock to 57,108,717, of which 2,112,025 were be designated as Series 1 redeemable convertible preferred stock, 14,996,692 as Series A redeemable convertible preferred stock, 23,000,000 as Series B redeemable convertible preferred stock and 17,000,000 as Series C redeemable convertible preferred stock. In the second quarter of 2016, the Company authorized 16,828,217 shares of its Series C redeemable convertible preferred stock and issued 5,609,398 shares of its Series C redeemable convertible preferred stock for cash consideration at a price of $8.91 per share. Total additional proceeds amounted to $50,000. Prior to the IPO, the holders of the Company’s convertible preferred stock had certain voting and dividend rights, as well as liquidation preferences and conversion privileges. All rights, preferences and privileges associated with the convertible preferred stock were terminated at the time of the Company’s IPO in conjunction with the conversion of all outstanding shares of convertible preferred stock into shares of common stock. On May 22, 2017, the Company closed its IPO of 7,781,564 shares of the Company’s common stock at a public offering price of $15.00 per share, including 781,564 shares of common stock issued upon exercise by the underwriters of their option to purchase additional shares. The gross proceeds from the IPO were $116.7 million and net proceeds were $107.1 million, after deducting underwriting discounts and commissions and other offering expenses payable by the Company. Upon closing of the IPO, all outstanding shares of the Company’s preferred stock were automatically converted into 18,933,053 shares of common stock. In connection with the IPO, the Board of Directors and the stockholders of the Company approved a one-for-three reverse stock split of the Company’s common stock. The reverse stock split became effective on May 11, 2017. All share and per share amounts in the financial statements have been retroactively adjusted for all periods presented to give effect to the reverse stock split, including reclassifying an amount equal to the reduction in par value to accumulated deficit. Series B preferred stock tranche rights Pursuant to the terms of the Series B Preferred Stock Purchase Agreement, the purchasers of Series B redeemable convertible preferred stock at the initial closing also committed to purchase an aggregate of 3,791,272 shares of Series B redeemable convertible preferred stock at $4.3521 per share (the “Second Tranche Shares”) at a second closing, subject to certain conditions, upon the achievement of one of the following milestones: (i) the Company’s enrollment of ten patients in an IV trilaciclib SCLC chemoprotection clinical trial with resulting data trending positively against historical controls or (ii) successful completion of IND-enabling studies for an oral trilaciclib antineoplastic program; provided, that either milestone is achieved prior to the earliest to occur of (i) a qualified initial public offering, (ii) a liquidation event or (iii) 12 months after the initial closing. Holders of at least sixty percent (60%) of the then-outstanding shares of Series B redeemable convertible preferred stock may elect to waive the foregoing conditions and to require the purchasers of Series B redeemable convertible preferred stock to purchase their pro rata portion of the Second Tranche Shares. Each purchaser also had the option, but not the obligation, to purchase all of its allocation of the Second Tranche Shares at any time prior to the earlier to occur of (i) the second closing, and (ii) 12 months after the initial closing. The option to purchase shares of Series B redeemable convertible preferred stock in the second tranche has been accounted for as a free-standing instrument and classified as a liability. On February 4, 2015, upon purchase of the first tranche of Series B redeemable convertible preferred stock, the option to purchase additional shares was recorded at its fair value, with the remaining cash proceeds received on that date allocated to Series B redeemable convertible preferred stock. As the value of the option to purchase shares in the second tranche increased over time, a change in the fair value of the liability was recorded as “Change in fair value of Series B purchase option liability” in the accompanying statement of operations. This free-standing instrument was exercised on December 10, 2015 when the holders of at least sixty percent (60%) of the then-outstanding shares of Series B redeemable convertible preferred stock elected to waive the conditions set forth above and required the purchasers of Series B redeemable convertible preferred stock to purchase their pro rata portion of the second tranche shares resulting in an outstanding liability of $0 on December 31, 2016. The Company relied on an independent third-party valuation in estimating the fair value of its Series B purchase option liability. The valuations used significant assumptions including the estimated volatility range of 68%-71%, risk free interest rate range of 0.47%-0.94%, estimated fair value of the redeemable convertible preferred stock and a 2-year estimated life of the purchase option. These assumptions were used in the option pricing method and the probability weighted expected return method, a blend of which were considered in establishing fair value. Preferred stock Upon completion of the IPO, all outstanding preferred stock was automatically converted into 18,933,053 shares of common stock. The Company is also authorized to issue 5.0 million shares of undesignated preferred stock in one or more series. As December 31, 2017, no shares of preferred stock were issued or outstanding. Common stock The Company’s common stock has a par value of $0.0001 per share and consists of 120,000,000 and 73,000,000 authorized shares as of December 31, 2017 and 2016, respectively. Holders of common stock are entitled to one vote per share and are entitled to receive dividends, as if and when declared by the Company’s Board of Directors. The Company has reserved authorized shares of common stock for future issuance at December 31, 2017 and December 31, 2016 as follows: December 31, 2017 December 31, 2016 Conversion of Series C Preferred Stock on a fully-diluted basis — 5,609,398 Conversion of Series B Preferred Stock on a fully-diluted basis — 7,642,734 Conversion of Series A Preferred Stock on a fully-diluted basis — 4,998,895 Conversion of Series 1 Preferred Stock on a fully-diluted basis — 682,026 Common stock warrants issued with promissory notes — 16,666 Other common stock warrants — 3,466 Series 1 Preferred Stock warrants issued with promissory notes — 21,978 Common stock options outstanding 4,116,333 3,690,058 Options available for grant under Equity Incentive Plans 1,602,687 176,919 5,719,020 22,842,140 |
Stock option plan
Stock option plan | 12 Months Ended |
Dec. 31, 2017 | |
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | |
Stock option plan | 8. Stock option plan 2011 Equity Incentive Plan In March 2011, the Company adopted the 2011 Equity Incentive Plan (the “Plan”). As amended, 4,400,640 shares of common stock were reserved for issuance under the 2011 Plan. Eligible plan participants included employees, directors, officers, consultants and advisors of the Company. The 2011 plan permitted the granting of incentive stock options, nonqualified stock options and other stock- based awards. 2017 Equity Incentive Plan In May 2017, the Company adopted the 2017 Equity Incentive Plan (the “2017 Plan”). The 2017 Plan provided for the direct award or sale of the Company’s common stock and for the grant of up to 1,932,000 stock options to employees, directors, officers, consultants and advisors of the Company. The 2017 Plan provides for the grant of incentive stock options, non-statutory stock options or restricted stock. Under both the 2011 Plan and the 2017 Plan, options to purchase the Company’s common stock may be granted at a price no less than the fair market value of a share of common stock on the date of grant. The fair value shall be the closing sales price for a share as quoted on any established securities exchange for such grant date or the last preceding date for which such quotation exists. Vesting terms of options issued are determined by the board of directors or compensation committee of the board. The Company’s stock options vest based on terms in the stock option agreements. Stock options have a maximum term of ten years. As of December 31, 2017, there were a total of 1,602,687 shares of common stock available for future issuance under the 2017 Plan. Stock-based Compensation During the years ended December 31, 2017, 2016 and 2015, the Company recorded employee share-based compensation expense of $1,772, $907, and $180, respectively. The Company recorded non-employee share-based compensation expense of $1,622, $484, and $209 during the years ended December 31, 2017, 2016 and 2015, respectively. Total share-based compensation expense included in the statements of operations is as follows: Year Ended December 31, 2017 2016 2015 in thousands Research and development $ 2,531 $ 911 $ 221 General and administrative 863 480 168 Total stock-based compensation expense $ 3,394 $ 1,391 $ 389 The fair value of each option grant is estimated on the grant date using the Black-Scholes option-pricing model, using the following weighted average assumptions: Year Ended December 31, 2017 2016 2015 Expected volatility 74.2 - 79.3% 74.8 - 83.9% 66.8 - 69.3% Weighted-average risk-free rate 1.9 - 2.2% 1.2 - 2.1% 1.5 - 1.7% Dividend yield —% —% —% Expected term (in years) 6.01 6.40 6.56 Weighted-average grant-date fair value per share $ 10.71 $ 3.24 $ 1.59 The expected term of stock options represents the weighted-average period the stock options are expected to remain outstanding and is based on the option vesting term, contractual terms and industry peers as the Company did not have sufficient historical information to develop reasonable expectations about future exercise patterns and post-vesting employment termination behavior. The expected stock price volatility assumptions for the Company’s stock options were determined by examining the historical volatilities for industry peers. The risk-free interest rate assumption at the date of grant is based on the U.S. Treasury instruments whose term was consistent with the expected term of the Company’s stock options. The expected dividend assumption is based on the Company’s history and expectation of dividend payouts. Stock option activity during 2017 is as follows: Weighted average Weighted Remaining average contractual Aggregate Options exercise for intrinsic outstanding price life (Years) value (in thousands) Balance as of December 31, 2016 3,690,058 $ 2.13 8.4 $ 17,463 Cancelled (89,687 ) $ 3.81 Granted 688,997 15.96 Exercised (173,035 ) 2.24 Balance as of December 31, 2017 4,116,333 $ 4.41 7.8 $ 63,577 Exercisable at December 31, 2017 2,225,970 1.64 7.2 $ 40,523 Vested at December 31, 2017 and expected to vest 4,116,333 4.41 7.8 $ 63,577 As of December 31, 2017, there was $10,404 of total unrecognized share-based compensation costs, net of estimated forfeitures, which is expected to be recognized over a weighted-average period of 2.93 years. In 2016, in connection with preparation of the 2015 financials, the Company reassessed the determination of the fair value of the common shares underlying stock options granted throughout 2015. As a result, the Company determined that the fair value of the common shares was $0.75, $2.40 and $2.73 per share at February 27, 2015, July 15, 2015 and September 7, 2015, respectively, which was higher than the fair value as initially determined by the Board of Directors on the dates of grant. The use of this higher share price increased both recognized and unrecognized share-based compensation expense and also impacted the valuation of the non-employee share-based compensation expense which is marked to market at each reporting date. In 2017, in connection with the Company’s initial public offering and after discussions with their underwriters, the Company reassessed the determination of the fair value of the common shares underlying the 1,099,320 stock options granted throughout 2016, and the 119,997 options granted up through the IPO date of May 16, 2017, and determined that no adjustment was necessary. Since the IPO, the board of directors has determined the fair value of each common share underlying share-based awards based on the closing price of the common shares as reported by Nasdaq on the date of grant. |
Net Loss Per Common Share
Net Loss Per Common Share | 12 Months Ended |
Dec. 31, 2017 | |
Earnings Per Share [Abstract] | |
Net Loss Per Common Share | 9. Net loss per common share Basic net loss per common share is computed using the weighted average number of common shares outstanding during the period including nominal issuances of common stock warrants. Diluted net loss per common share is computed using the sum of the weighted average number of common shares outstanding during the period and, if dilutive, the weighted average number of potential shares of common stock, including the assumed exercise of stock options, stock warrants and unvested restricted common stock. For the years ended December 31, 2017, 2016 and 2015, the following potentially dilutive securities have been excluded from the computations of diluted weighted-average shares outstanding because the effect would be anti-dilutive: Year Ended December 31, 2017 2016 2015 Stock options issued and outstanding 3,838,358 3,224,682 1,867,325 Stock warrants 11,385 25,444 25,444 3,849,743 3,250,126 1,892,769 Amounts in the table above reflect the common stock equivalents of the noted instruments. |
Income Taxes
Income Taxes | 12 Months Ended |
Dec. 31, 2017 | |
Income Tax Disclosure [Abstract] | |
Income Taxes | 10. Income taxes Income taxes are accounted for using the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statements carrying amounts of assets and liabilities and their respective tax bases, operating loss carryforwards, and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. In accordance with FASB ASC 740, Accounting for Income Taxes The components of income tax expense (benefit) attributable to continuing operations are as follows: Year ended December 31, 2017 2016 2015 Current Expense: Federal $ — $ — $ — State — — — — — — Deferred Expense: Federal — — — State — — — $ — $ — $ — The differences between the company’s income tax expense attributable to continuing operation and the expense computed at the 34% U.S. statutory income tax rate were as follows (in thousands): Year ended December 31, 2017 2016 2015 Federal income tax expense at statutory rate: $ (20,441 ) $ (10,299 ) $ (6,890 ) Increase (reduction) in income tax resulting from: State Income Taxes (1,623 ) (397 ) (335 ) Increase in Valuation Allowance 8,977 10,936 6,109 Increase in fair value of Series B purchase option liability — — 1,623 Equity Financing Expenses 39 371 — Stock Compensation 152 200 48 Research and Development Credit (1,882 ) (803 ) (509 ) Effect on Tax Cuts & Job Acts Rate Reduction 14,770 — — Other 8 (8 ) (46 ) $ — $ — $ — The tax effects of temporary differences and operating loss carryforwards that gave rise to significant portions of the deferred tax assets and deferred tax liabilities were as follows at December 31, 2017 and 2016 (in thousands): Year ended December 31, 2017 2016 Deferred tax assets Accrued expenses $ 1,412 $ 751 Deferred rent 20 16 Stock compensation 360 386 Charitable contributions 2 1 Capitalized patents and licenses 1,225 1,474 R&D credits 3,333 1,451 Net operating loss carryforwards 23,556 16,844 Deferred tax assets 29,908 20,923 Deferred tax liabilities Property, plant and equipment, primarily due to differences in depreciation (21 ) (13 ) Deferred tax liabilities (21 ) (13 ) Valuation allowance (29,887 ) (20,910 ) Net deferred tax assets $ — $ — At December 31, 2017 and December 31, 2016, the Company evaluated all significant available positive and negative evidence, including the existence of losses in recent years and management’s forecast of future taxable income, and, as a result, determined it was more likely than not that federal and state deferred tax assets, including benefits related to net operating loss carryforwards, would not be realized. The valuation allowance was increased from $20,910 at December 31, 2016 to $29,887 at December 31, 2017. The increase in valuation allowance was due primarily to the increase in net operating loss carryforwards and income tax credits offset by the impact of the Tax Cuts and Job Act rate reduction. The table below summarizes changes in the deferred tax valuation allowance (in thousands): 2017 2016 2015 Balance at beginning of year $ 20,910 $ 9,974 $ 3,865 Charges to costs and expenses 8,977 10,936 6,109 Write-offs — — — Balance at end of year 29,887 20,910 9,974 At December 31, 2017, the Company has federal net operating loss carryforwards of approximately $100,795, which are available to offset future taxable income. The federal net operating loss carryforwards begin to expire in 2028. In addition, the Company has state net operating loss carryforwards totaling approximately $100,793, which are available to offset future state taxable income. State net operating losses begin to expire in 2023. Because the Company has incurred cumulative net operating losses since inception, all tax years remain open to examination by U.S. federal and state income tax authorities. In accordance with FASB ASC 740, Accounting for Income Taxes On December 22, 2017, the Tax Cuts and Jobs Act (“Tax Act”) was signed into law. The Tax Act lowered the Federal corporate tax rate from 34% to 21% and made numerous other tax law changes. The Company has measured deferred tax assets at the enacted tax rate expected to apply when these temporary differences are expected to be realized or settled, resulting in a provisional charge of $14.8 million for the revaluation of the Company’s deferred tax assets. U.S. GAAP requires companies to recognize the effect of tax law changes in the period of enactment. Reasonable estimates were made based on the Company’s analysis of the Tax Act. These provisional amounts may be adjusted during 2018 when additional information is obtained. Additional information that may affect our provisional amounts would include further clarification and guidance on how the Internal Revenue Service will implement the Tax Act, including guidance with respect to guidance on how state taxing authorities will implement tax reform and the related effect on our state income tax returns, completion of our 2017 tax return filings, and the potential for additional guidance from the Financial Accounting Standards Board related to the Tax Act. Under the Tax Act, NOLs arising after December 31, 2017 may be carried forward indefinitely. However, for NOLs arising after December 31, 2017, NOL carryforwards will be limited to 80% of taxable income. The Company’s NOLs generated in 2017 and in prior years will not be subject to the limitations under the Tax Act. Potential 382 Limitation The Company’s ability to utilize its net operating loss (NOL) and research and development (R&D) credit carryforwards may be substantially limited due to ownership changes that may have occurred or that could occur in the future, as required by Section 382 of the Internal Revenue Code of 1986, as amended (the Code), as well as similar state provisions. These ownership changes may limit the amount of NOL and R&D credit carryforwards that can be utilized annually to offset future taxable income and tax, respectively. In general, an “ownership change,” as defined by Section 382 of the Code, results from a transaction or series of transactions over a three-year period resulting in an ownership change of more than 50 percent of the outstanding stock of a company by certain stockholders or public groups. The Company has not completed a study to assess whether one or more ownership changes have occurred since the Company became a loss corporation under the definition of Section 382. If the Company has experienced an ownership change, utilization of the NOL or R&D credit carryforwards would be subject to an annual limitation, which is determined by first multiplying the value of the Company’s stock at the time of the ownership change by the applicable long-term, tax-exempt rate, and then could be subject to additional adjustments, as required. Any such limitation may result in the expiration of a portion of the NOL or R&D credit carryforwards before utilization. Until a study is completed and any limitation known, no amounts are being considered as an uncertain tax position or disclosed as an unrecognized tax benefit under ASC-740. Any carryforwards that expire prior to utilization as a result of such limitations will be removed from deferred tax assets with a corresponding reduction of the valuation allowance. Due to the existence of the valuation allowance, it is not expected that any possible limitation will have an impact on the results of operations of the Company. |
Related Party Transactions
Related Party Transactions | 12 Months Ended |
Dec. 31, 2017 | |
Related Party Transactions [Abstract] | |
Related Party Transactions | 11. Related party transactions Two co-founders and shareholders of the Company had consulting agreements with the Company for their continued development work through June 30, 2017. The Company renewed its consulting agreement with one of these founders through June 30, 2019. Combined consulting fees paid to both founders were approximately $64, $108, and $104 for the years ended December 31, 2017, 2016 and 2015, respectively. The Company paid approximately $11, $14, $20 to the Chairman of the Board of Directors for scientific advisory services outside of his role on the board of directors during the years ended December 31, 2017, 2016 and 2015, respectively. |
Quarterly Results of Operations
Quarterly Results of Operations (Unaudited) | 12 Months Ended |
Dec. 31, 2017 | |
Quarterly Financial Information Disclosure [Abstract] | |
Quarterly Results of Operations (Unaudited) | 12. Quarterly Results of Operations (Unaudited) The following table contains quarterly financial information for 2017 and 2016. The Company believes that the following information reflects all normal recurring adjustments necessary for a fair statement of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results for any future period. Three Months Ended (unaudited) (in thousands, except share and per share amounts) March 31, June 30, September 30, December 31, 2017 2017 2017 2017 Total operating expenses $ 12,378 $ 15,379 $ 15,929 $ 17,282 Operating loss (12,378 ) (15,379 ) (15,929 ) (17,282 ) Total other income (expense), net 33 185 328 301 Net loss $ (12,345 ) $ (15,194 ) $ (15,601 ) $ (16,981 ) Accretion of redeemable convertible preferred stock (4,468 ) (289 ) — — Net loss attributable to common stockholders $ (16,813 ) $ (15,483 ) $ (15,601 ) $ (16,981 ) Net loss per share attributable to common stockholders, basic and diluted $ (11.24 ) $ (1.09 ) $ (0.55 ) $ (0.60 ) Weighted average common shares outstanding, basic and diluted 1,496,336 14,208,115 28,318,656 28,362,323 March 31, June 30, September 30, December 31, 2016 2016 2016 2016 Total operating expenses $ 5,946 $ 7,429 $ 6,613 $ 10,403 Operating loss (5,946 ) (7,429 ) (6,613 ) (10,403 ) Total other income (expense), net (8 ) 50 56 2 Net loss and comprehensive loss $ (5,954 ) $ (7,379 ) $ (6,557 ) $ (10,401 ) Accretion of redeemable convertible preferred stock (1,009 ) (986 ) (1,205 ) (1,205 ) Net loss attributable to common stockholders $ (6,963 ) $ (8,365 ) $ (7,762 ) $ (11,606 ) Net loss per share attributable to common stockholders, basic and diluted $ (4.71 ) $ (5.63 ) $ (5.21 ) $ (7.77 ) Weighted average common shares outstanding, basic and diluted 1,447,219 1,486,303 1,490,552 1,493,753 |
Subsequent Events
Subsequent Events | 12 Months Ended |
Dec. 31, 2017 | |
Subsequent Events [Abstract] | |
Subsequent Events | 13. Subsequent events In January 2018, the Company signed an amendment to its current lease to secure additional 6,395 square feet of office space in its existing building. The Company expects the space to be available in July 2018. |
Summary of Significant Accoun20
Summary of Significant Accounting Policies (Policies) | 12 Months Ended |
Dec. 31, 2017 | |
Accounting Policies [Abstract] | |
Basis of Presentation | Basis of presentation The Company has prepared the accompanying financial statements in conformity with generally accepted accounting principles in the United States of America (“U.S. GAAP”). |
Use of Estimates | Use of estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and the accompanying notes. Actual results could differ from those estimates. These estimates include the Company’s common stock valuation, warrant valuation and deferred tax asset valuation allowance. |
Cash and Cash Equivalents | Cash and cash equivalents The Company considers all highly liquid investments purchased with an original maturity of three months or less at the date of purchase to be cash equivalents. Cash and cash equivalents at December 31, 2017 consist of amounts on deposit in banks, including checking accounts, money market accounts and certificates of deposit. Cash deposits are all in financial institutions in the United States. |
Concentration of Credit Risk | Concentration of credit risk Financial instruments that potentially subject the Company to credit risk consist of cash and cash equivalents. Deposits with financial institutions are insured, up to certain limits, by the Federal Deposit Insurance Corporation (“FDIC”). The Company’s cash deposits often exceed the FDIC insurance limit; however, all deposits are maintained with high credit quality institutions and the Company has not experienced any losses in such accounts. The financial condition of financial institutions is periodically reassessed, and the Company believes the risk of any loss is minimal. The Company believes the risk of any loss on cash due to credit risk is minimal. |
Property and Equipment | Property and equipment Property and equipment are stated at cost less accumulated depreciation. Depreciation is generally calculated using the straight-line method over the following estimated useful lives: Computer equipment 5 years Laboratory equipment 5 years Furniture and fixtures 7 years Leasehold improvements 7 years Costs associated with maintenance and repairs are charged to expense as incurred. Property and equipment held under leasehold improvements are amortized over the shorter of the lease term or the estimated useful life of the related asset. |
Impairment of Long-Lived Assets | Impairment of long-lived assets The Company evaluates its long-lived assets for indicators of possible impairment by comparison of the carrying amounts to future net undiscounted cash flows expected to be generated by such assets when events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. Should an impairment exist, the impairment loss would be measured based on the excess carrying value of the asset over the asset’s fair value based on discounted estimates of future cash flows. For the years ended December 31, 2017, 2016 and 2015, the Company’s management evaluated its long-lived assets and determined no impairment charge was needed. |
Warrant Liability | Warrant liability Warrants to purchase the Company’s redeemable convertible preferred stock have been classified as liabilities and are recorded at their estimated fair value. In each reporting period, any change in fair value of the warrants has been recorded as expense in the case of an increase in fair value and income in the case of a decrease in fair value. |
Series B Purchase Option Liability | Series B purchase option liability The option to purchase shares of Series B redeemable convertible preferred stock in the second tranche has been accounted for as a free-standing instrument and classified as a liability. On February 4, 2015, upon purchase of the first tranche of Series B Preferred Stock, the option to purchase additional shares was recorded at its fair value, with the remaining cash proceeds received on that date allocated to Series B Preferred Stock. As the value of the option to purchase shares in the second tranche increased over time, a change in the fair value of the liability was recorded as “Change in fair value of Series B purchase option liability” in the accompanying statement of operations. This free-standing instrument was exercised on December 10, 2015 when the holders exercised their right to require the purchase of the second tranche shares by the holders of the outstanding shares of Series B Preferred Stock, resulting in an outstanding liability of $0 on December 31, 2016 and 2017. |
Research and Development | Research and development Research and development expenses consist of costs incurred to further the Company’s research and development activities and include salaries and related employee benefits, manufacturing of pharmaceutical active ingredients and drug products, costs associated with clinical trials, nonclinical activities, regulatory activities, research-related overhead expenses and fees paid to expert consultants, external service providers and contract research organizations which conduct certain research and development activities on behalf of the Company. Costs incurred in the research and development of products are charged to research and development expense as incurred. Each reporting period, the Company estimates and accrues expenses, the largest of which is related to accrued research and development expenses. This process involves reviewing contracts and purchase orders, identifying services that have been performed on the Company’s behalf, and estimating the level of service performed and the associated cost incurred for the service when the Company has not yet been invoiced or otherwise notified of the actual costs. Costs for preclinical studies and clinical trial activities are recognized based on an evaluation of vendors’ progress towards completion of specific tasks, using data such as patient enrollment, clinical site activations or information provided by vendors regarding their actual costs incurred. Payments for these activities are based on the terms of individual contracts and payment timing may differ significantly from the period in which the services were performed. The Company determines accrual estimates through reports from and discussions with applicable personnel and outside service providers as to the progress or state of completion of trials, or the services completed. The estimates of accrued expenses as of each balance sheet date are based on the facts and circumstances known at the time. |
Revenue Recognition | Revenue recognition The Company received the majority of its revenues from grant programs authorized by Congress through the Small Business Innovation Research (SBIR) program and the Small Business Technology Transfer Act (STTR) of 1992. In addition, the Company was also awarded grant funds through other federal and state programs related to its research. Under the terms of the grants, the Company is entitled to receive reimbursement of its allowable direct expenses, allocated overhead and general and administrative expenses. Revenue received under these grant programs is recognized as direct project costs are incurred, plus a portion of the Company’s indirect costs such as overhead and general and administrative expenses allocated to the project. The Company’s grant agreements are fixed fee arrangements. In the event that the granting agency provides advance funding of a grant award, the Company records deferred revenues and then recognizes revenue as costs are incurred over the life of the grant. To date, the Company has not generated any revenue from the commercial sale of its product candidates. |
Fair Value of Financial Instruments | Fair value of financial instruments The Company provides disclosure of financial assets and financial liabilities that are carried at fair value based on the price that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements may be classified based on the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities using the following three levels: Level 1 Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Level 2 Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means. Level 3 Unobservable inputs that reflect the Company’s estimates of the assumptions that market participants would use in pricing the asset or liability. The Company develops these inputs based on the best information available, including its own data. The carrying amounts of cash, cash equivalents, accounts payable and accrued liabilities approximate fair value because of their short-term nature. At December 31, 2017 and 2016 these financials instruments and respective fair values have been classified as follows (in thousands): Quoted prices in active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant other unobservable inputs (Level 3) Balance at December 31, 2017 Assets Money market funds $ 87,694 $ — $ — $ 87,694 Certificates of Deposit 15,203 — — 15,203 Total assets at fair value: $ 102,897 $ — $ — $ 102,897 Liabilities: Warrant Liability $ — $ — $ — $ — Total liabilities at fair value: $ — $ — $ — $ — Quoted prices in active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant other unobservable inputs (Level 3) Balance at December 31, 2016 Assets Money market funds $ 31,730 $ — $ — $ 31,730 Certificates of Deposit 15,041 — — 15,041 Total assets at fair value: $ 46,771 $ — $ — $ 46,771 Liabilities: Warrant Liability $ — $ — $ 167 $ 167 Total liabilities at fair value: $ — $ — $ 167 $ 167 The change in the fair value measurement using significant inputs (Level 3) is summarized below (in thousands): Balance at December 31, 2015 $ 85 Change in fair value in warrant liability 82 Balance at December 31, 2016 $ 167 Change in fair value in warrant liability 41 Conversion of warrant to common stock warrant (208 ) Balance at December 31, 2017 $ — |
Patent Costs | Patent costs Costs associated with the submission of patent applications are expensed as incurred given the uncertainty of the future economic benefits of the patents. Patent-related legal expenses included in general and administrative costs were approximately $997, $1,034, and $691 for the years ended December 31, 2017, 2016 and 2015, respectively. |
Income Taxes | Income taxes Income taxes are accounted for using the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statements carrying amounts of assets and liabilities and their respective tax bases, operating loss carryforwards, and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. In accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 740, Accounting for Income Taxes |
Stock-Based Compensation | Stock-based compensation The primary type of stock-based payments utilized by the Company are stock options. The Company accounts for stock-based employee compensation arrangements by measuring the cost of employee services received in exchange for all equity awards granted based on the fair value of the award on the grant date. The fair value of each employee stock option is estimated on the date of grant using an options pricing model. The Company currently uses the Black-Scholes valuation model to estimate the fair value of its share-based payments. The model requires management to make a number of assumptions including expected volatility, expected life, risk-free interest rate and expected dividends. The Company accounts for stock-based non-employee compensation arrangements by recording the expense of such services based on the fair value of the equity instrument as estimated using the Black-Scholes pricing model. The fair value of the equity instrument is charged to operating expense over the term of the service agreement. |
Segment Information | Segment information The Company manages its operations as a single segment for the purposes of assessing performance and making operating decisions. All of the Company’s assets are held in the United States. |
Comprehensive Loss | Comprehensive loss Comprehensive loss includes net loss as well as other changes in stockholders’ equity (deficit) that result from transactions and economic events other than those with stockholders. There was no difference between net loss and comprehensive loss for each of the periods presented in the accompanying financial statements. |
Redeemable Convertible Preferred Stock | Redeemable convertible preferred stock The Company classifies its redeemable convertible preferred stock, for which the Company does not control the redemption, outside of permanent equity. The Company records redeemable convertible preferred stock at fair value upon issuance, net of any offering costs, and the carrying value is adjusted to the redemption value at the end of each reporting period. These adjustments are effected through charges against additional paid-in capital and accumulated deficit. |
New Accounting Standards | New accounting standards In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718) In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) In May 2014, the FASB and the International Accounting Standards Board jointly issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) |
Summary of Significant Accoun21
Summary of Significant Accounting Policies (Tables) | 12 Months Ended |
Dec. 31, 2017 | |
Accounting Policies [Abstract] | |
Schedule of Property and Equipment Estimated Useful Lives | Depreciation is generally calculated using the straight-line method over the following estimated useful lives: Computer equipment 5 years Laboratory equipment 5 years Furniture and fixtures 7 years Leasehold improvements 7 years |
Summary of Financials Instruments and Respective Fair Values | At December 31, 2017 and 2016 these financials instruments and respective fair values have been classified as follows (in thousands): Quoted prices in active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant other unobservable inputs (Level 3) Balance at December 31, 2017 Assets Money market funds $ 87,694 $ — $ — $ 87,694 Certificates of Deposit 15,203 — — 15,203 Total assets at fair value: $ 102,897 $ — $ — $ 102,897 Liabilities: Warrant Liability $ — $ — $ — $ — Total liabilities at fair value: $ — $ — $ — $ — Quoted prices in active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant other unobservable inputs (Level 3) Balance at December 31, 2016 Assets Money market funds $ 31,730 $ — $ — $ 31,730 Certificates of Deposit 15,041 — — 15,041 Total assets at fair value: $ 46,771 $ — $ — $ 46,771 Liabilities: Warrant Liability $ — $ — $ 167 $ 167 Total liabilities at fair value: $ — $ — $ 167 $ 167 |
Summary of Change in Fair Value Measurement Using Significant Inputs (Level 3) | The change in the fair value measurement using significant inputs (Level 3) is summarized below (in thousands): Balance at December 31, 2015 $ 85 Change in fair value in warrant liability 82 Balance at December 31, 2016 $ 167 Change in fair value in warrant liability 41 Conversion of warrant to common stock warrant (208 ) Balance at December 31, 2017 $ — |
Property and Equipment (Tables)
Property and Equipment (Tables) | 12 Months Ended |
Dec. 31, 2017 | |
Property Plant And Equipment [Abstract] | |
Schedule of Property and Equipment | Property and equipment consists of the following (in thousands): December 31, 2017 December 31, 2016 Computer equipment $ 112 $ 67 Laboratory equipment 283 207 Furniture and fixtures 174 64 Leasehold improvements 121 80 Construction in progress 1 — Accumulated depreciation (181 ) (107 ) Property and equipment, net $ 510 $ 311 |
Accrued expenses (Tables)
Accrued expenses (Tables) | 12 Months Ended |
Dec. 31, 2017 | |
Payables And Accruals [Abstract] | |
Schedule of Accrued Expenses | Accrued expenses are comprised as follows (in thousands): December 31, 2017 December 31, 2016 Accrued external research and professional fees $ 1,402 $ 295 Accrued external clinical study costs 4,788 1,897 Accrued compensation expense 1,328 617 Deferred rent, current portion 2 44 Accrued expenses $ 7,520 $ 2,853 |
Lease Obligations (Tables)
Lease Obligations (Tables) | 12 Months Ended |
Dec. 31, 2017 | |
Leases [Abstract] | |
Schedule of Minimum Future Rental Payments on Noncancelable Operating Leases | The following is a schedule by years of minimum future rental payments on noncancelable operating leases as of December 31, 2017 (in thousands): 2018 $ 294 2019 303 2020 312 2021 321 2022 331 2023 — $ 1,561 |
Capitalization (Tables)
Capitalization (Tables) | 12 Months Ended |
Dec. 31, 2017 | |
Capitalization Longterm Debt And Equity [Abstract] | |
Summary of common stock shares reserved for future issuance | The Company has reserved authorized shares of common stock for future issuance at December 31, 2017 and December 31, 2016 as follows: December 31, 2017 December 31, 2016 Conversion of Series C Preferred Stock on a fully-diluted basis — 5,609,398 Conversion of Series B Preferred Stock on a fully-diluted basis — 7,642,734 Conversion of Series A Preferred Stock on a fully-diluted basis — 4,998,895 Conversion of Series 1 Preferred Stock on a fully-diluted basis — 682,026 Common stock warrants issued with promissory notes — 16,666 Other common stock warrants — 3,466 Series 1 Preferred Stock warrants issued with promissory notes — 21,978 Common stock options outstanding 4,116,333 3,690,058 Options available for grant under Equity Incentive Plans 1,602,687 176,919 5,719,020 22,842,140 |
Stock option plan (Tables)
Stock option plan (Tables) | 12 Months Ended |
Dec. 31, 2017 | |
Summary of Stock Option Activity | Stock option activity during 2017 is as follows: Weighted average Weighted Remaining average contractual Aggregate Options exercise for intrinsic outstanding price life (Years) value (in thousands) Balance as of December 31, 2016 3,690,058 $ 2.13 8.4 $ 17,463 Cancelled (89,687 ) $ 3.81 Granted 688,997 15.96 Exercised (173,035 ) 2.24 Balance as of December 31, 2017 4,116,333 $ 4.41 7.8 $ 63,577 Exercisable at December 31, 2017 2,225,970 1.64 7.2 $ 40,523 Vested at December 31, 2017 and expected to vest 4,116,333 4.41 7.8 $ 63,577 |
Employee and Non-employee Stock Options | |
Summary of Share-Based Compensation Expense Included in the Statement of Operations | Total share-based compensation expense included in the statements of operations is as follows: Year Ended December 31, 2017 2016 2015 in thousands Research and development $ 2,531 $ 911 $ 221 General and administrative 863 480 168 Total stock-based compensation expense $ 3,394 $ 1,391 $ 389 |
Summary of Fair Value of Stock Options Granted Using Black-Scholes Options Pricing Model | The fair value of each option grant is estimated on the grant date using the Black-Scholes option-pricing model, using the following weighted average assumptions: Year Ended December 31, 2017 2016 2015 Expected volatility 74.2 - 79.3% 74.8 - 83.9% 66.8 - 69.3% Weighted-average risk-free rate 1.9 - 2.2% 1.2 - 2.1% 1.5 - 1.7% Dividend yield —% —% —% Expected term (in years) 6.01 6.40 6.56 Weighted-average grant-date fair value per share $ 10.71 $ 3.24 $ 1.59 |
Net Loss Per Common Share (Tabl
Net Loss Per Common Share (Tables) | 12 Months Ended |
Dec. 31, 2017 | |
Earnings Per Share [Abstract] | |
Schedule of Potentially Dilutive Securities Excluded from Computations of Diluted Weighted-average Shares Outstanding | For the years ended December 31, 2017, 2016 and 2015, the following potentially dilutive securities have been excluded from the computations of diluted weighted-average shares outstanding because the effect would be anti-dilutive: Year Ended December 31, 2017 2016 2015 Stock options issued and outstanding 3,838,358 3,224,682 1,867,325 Stock warrants 11,385 25,444 25,444 3,849,743 3,250,126 1,892,769 |
Income taxes (Tables)
Income taxes (Tables) | 12 Months Ended |
Dec. 31, 2017 | |
Income Tax Disclosure [Abstract] | |
Components of Income Tax Expense (Benefit) Attributable to Continuing Operations | The components of income tax expense (benefit) attributable to continuing operations are as follows: Year ended December 31, 2017 2016 2015 Current Expense: Federal $ — $ — $ — State — — — — — — Deferred Expense: Federal — — — State — — — $ — $ — $ — |
Summary of Differences Between the Income Tax Expense Attributable to Continuing Operation and the Expense Computed at U.S. Statutory Income Tax Rate | The differences between the company’s income tax expense attributable to continuing operation and the expense computed at the 34% U.S. statutory income tax rate were as follows (in thousands): Year ended December 31, 2017 2016 2015 Federal income tax expense at statutory rate: $ (20,441 ) $ (10,299 ) $ (6,890 ) Increase (reduction) in income tax resulting from: State Income Taxes (1,623 ) (397 ) (335 ) Increase in Valuation Allowance 8,977 10,936 6,109 Increase in fair value of Series B purchase option liability — — 1,623 Equity Financing Expenses 39 371 — Stock Compensation 152 200 48 Research and Development Credit (1,882 ) (803 ) (509 ) Effect on Tax Cuts & Job Acts Rate Reduction 14,770 — — Other 8 (8 ) (46 ) $ — $ — $ — |
Components of Tax Effects of Temporary Differences and Operating Loss Carryforwards Including Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities | The tax effects of temporary differences and operating loss carryforwards that gave rise to significant portions of the deferred tax assets and deferred tax liabilities were as follows at December 31, 2017 and 2016 (in thousands): Year ended December 31, 2017 2016 Deferred tax assets Accrued expenses $ 1,412 $ 751 Deferred rent 20 16 Stock compensation 360 386 Charitable contributions 2 1 Capitalized patents and licenses 1,225 1,474 R&D credits 3,333 1,451 Net operating loss carryforwards 23,556 16,844 Deferred tax assets 29,908 20,923 Deferred tax liabilities Property, plant and equipment, primarily due to differences in depreciation (21 ) (13 ) Deferred tax liabilities (21 ) (13 ) Valuation allowance (29,887 ) (20,910 ) Net deferred tax assets $ — $ — |
Summary of Changes in the Deferred Tax Valuation Allowance | The table below summarizes changes in the deferred tax valuation allowance (in thousands): 2017 2016 2015 Balance at beginning of year $ 20,910 $ 9,974 $ 3,865 Charges to costs and expenses 8,977 10,936 6,109 Write-offs — — — Balance at end of year 29,887 20,910 9,974 |
Quarterly Results of Operatio29
Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended |
Dec. 31, 2017 | |
Quarterly Financial Information Disclosure [Abstract] | |
Quarterly Results of Operations | The following table contains quarterly financial information for 2017 and 2016. The Company believes that the following information reflects all normal recurring adjustments necessary for a fair statement of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results for any future period. Three Months Ended (unaudited) (in thousands, except share and per share amounts) March 31, June 30, September 30, December 31, 2017 2017 2017 2017 Total operating expenses $ 12,378 $ 15,379 $ 15,929 $ 17,282 Operating loss (12,378 ) (15,379 ) (15,929 ) (17,282 ) Total other income (expense), net 33 185 328 301 Net loss $ (12,345 ) $ (15,194 ) $ (15,601 ) $ (16,981 ) Accretion of redeemable convertible preferred stock (4,468 ) (289 ) — — Net loss attributable to common stockholders $ (16,813 ) $ (15,483 ) $ (15,601 ) $ (16,981 ) Net loss per share attributable to common stockholders, basic and diluted $ (11.24 ) $ (1.09 ) $ (0.55 ) $ (0.60 ) Weighted average common shares outstanding, basic and diluted 1,496,336 14,208,115 28,318,656 28,362,323 March 31, June 30, September 30, December 31, 2016 2016 2016 2016 Total operating expenses $ 5,946 $ 7,429 $ 6,613 $ 10,403 Operating loss (5,946 ) (7,429 ) (6,613 ) (10,403 ) Total other income (expense), net (8 ) 50 56 2 Net loss and comprehensive loss $ (5,954 ) $ (7,379 ) $ (6,557 ) $ (10,401 ) Accretion of redeemable convertible preferred stock (1,009 ) (986 ) (1,205 ) (1,205 ) Net loss attributable to common stockholders $ (6,963 ) $ (8,365 ) $ (7,762 ) $ (11,606 ) Net loss per share attributable to common stockholders, basic and diluted $ (4.71 ) $ (5.63 ) $ (5.21 ) $ (7.77 ) Weighted average common shares outstanding, basic and diluted 1,447,219 1,486,303 1,490,552 1,493,753 |
Description of Business - Addit
Description of Business - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended | |||
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | |
Description Of Business [Line Items] | ||||
Accumulated deficit | $ 129,118 | $ 64,985 | ||
Cash and cash equivalents | $ 103,812 | $ 47,305 | $ 22,938 | $ 3,694 |
Minimum | ||||
Description Of Business [Line Items] | ||||
Expected period to fund operations by existing cash resources | 12 months |
Summary of Significant Accoun31
Summary of Significant Accounting Policies - Schedule of Property and Equipment Estimated Useful Lives (Details) | 12 Months Ended |
Dec. 31, 2017 | |
Computer Equipment | |
Property Plant And Equipment [Line Items] | |
Estimated useful lives | 5 years |
Laboratory Equipment | |
Property Plant And Equipment [Line Items] | |
Estimated useful lives | 5 years |
Furniture and Fixtures | |
Property Plant And Equipment [Line Items] | |
Estimated useful lives | 7 years |
Leasehold Improvements | |
Property Plant And Equipment [Line Items] | |
Estimated useful lives | 7 years |
Summary of Significant Accoun32
Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 12 Months Ended | ||
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | |
Summary Of Significant Accounting Policies [Line Items] | |||
Impairment charge of long-lived assets | $ 0 | $ 0 | $ 0 |
Unrecognized income tax benefits | 0 | 0 | |
Accrued income taxes | 0 | 0 | |
Patent | General and Administrative Costs | |||
Summary Of Significant Accounting Policies [Line Items] | |||
Legal expenses | 997,000 | 1,034,000 | $ 691,000 |
Series B Purchase Option | |||
Summary Of Significant Accounting Policies [Line Items] | |||
Outstanding liability | $ 0 | $ 0 | |
Free-standing instrument exercised date | Dec. 10, 2015 | ||
Series B Purchase Option | Second Tranche | |||
Summary Of Significant Accounting Policies [Line Items] | |||
Free-standing instrument exercised date | Dec. 10, 2015 |
Summary of Significant Accoun33
Summary of Significant Accounting Policies - Summary of Financials Instruments and Respective Fair Values (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 |
Assets | ||
Assets at fair value | $ 102,897 | $ 46,771 |
Liabilities: | ||
Liabilities at fair value | 167 | |
Money Market Funds | ||
Assets | ||
Assets at fair value | 87,694 | 31,730 |
Certificates of Deposit | ||
Assets | ||
Assets at fair value | 15,203 | 15,041 |
Warrant Liability | ||
Liabilities: | ||
Liabilities at fair value | 167 | |
Quoted Prices in Active Markets for Identical Assets (Level 1) | ||
Assets | ||
Assets at fair value | 102,897 | 46,771 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Funds | ||
Assets | ||
Assets at fair value | 87,694 | 31,730 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of Deposit | ||
Assets | ||
Assets at fair value | $ 15,203 | 15,041 |
Significant Other Unobservable Inputs (Level 3) | ||
Liabilities: | ||
Liabilities at fair value | 167 | |
Significant Other Unobservable Inputs (Level 3) | Warrant Liability | ||
Liabilities: | ||
Liabilities at fair value | $ 167 |
Summary of Significant Accoun34
Summary of Significant Accounting Policies - Summary of Change in Fair Value Measurement Using Significant Inputs (Level 3) (Details) - USD ($) $ in Thousands | 12 Months Ended | |
Dec. 31, 2017 | Dec. 31, 2016 | |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | ||
Beginning balance | $ 167 | $ 85 |
Change in fair value | 41 | |
Ending balance | 0 | 167 |
Warrant | ||
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | ||
Change in fair value | $ 82 | |
Common Stock | ||
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | ||
Conversion of warrant | $ (208) |
Property and Equipment - Schedu
Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 |
Property Plant And Equipment [Line Items] | ||
Accumulated depreciation | $ (181) | $ (107) |
Property and equipment, net | 510 | 311 |
Computer Equipment | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | 112 | 67 |
Laboratory Equipment | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | 283 | 207 |
Furniture and Fixtures | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | 174 | 64 |
Leasehold Improvements | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | 121 | $ 80 |
Construction in Progress | ||
Property Plant And Equipment [Line Items] | ||
Property and equipment, gross | $ 1 |
Property and Equipment - Additi
Property and Equipment - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | |
Property Plant And Equipment [Abstract] | |||
Depreciation expenses relating to property and equipment | $ 89 | $ 67 | $ 42 |
Patent License Agreement - Addi
Patent License Agreement - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2015 |
Patent License Agreement [Line Items] | ||||
License agreement date | Dec. 31, 2015 | |||
Common stock, shares issued | 48,666 | |||
Common stock, fair value of stock issued | $ 181 | $ 181 | ||
University | ||||
Patent License Agreement [Line Items] | ||||
License agreement date | Nov. 23, 2016 | |||
Non-refundable license issue fee | $ 500 | |||
Term of license agreement description | The term of the license agreement will continue until the later of (i) the expiration of the last valid claim within the patent rights covering the product in such country, (ii) the expiration of market exclusivity in such country and (iii) the 10th anniversary of the first commercial sale in such country. The University may terminate the agreement in the event (i) the Company fails to pay any amount or make any report when required to be made and fails to cure such failure within thirty (30) days after receipt of notice from the University, (ii) is in breach of any provision of the agreement and fails to remedy within forty-five (45) days after receipt of notice, (iii) makes a report to the University under the agreement that is determine to be materially false, (iv) declares insolvency or bankruptcy or (v) takes an action that causes patent rights or technical information to be subject to lien or encumbrance and fails to remedy any such breach with in forty-five (45) days of receipt of notice from the University. The Company may terminate the agreement at any time on written notice to the University at least ninety (90) days prior to the termination date specified in the notice. Upon expiration or termination of the agreement, all rights revert to the University. | |||
License agreement termination notice period | 90 days | |||
University | Maximum [Member] | ||||
Patent License Agreement [Line Items] | ||||
Milestone payments | $ 2,625 |
Accrued Expenses - Schedule of
Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 |
Payables And Accruals [Abstract] | ||
Accrued external research and professional fees | $ 1,402 | $ 295 |
Accrued external clinical study costs | 4,788 | 1,897 |
Accrued compensation expense | 1,328 | 617 |
Deferred rent, current portion | 2 | 44 |
Accrued expenses | $ 7,520 | $ 2,853 |
Lease Obligations - Additional
Lease Obligations - Additional Information (Details) - USD ($) $ in Thousands | Mar. 27, 2017 | Jan. 27, 2016 | Apr. 01, 2014 | Jan. 10, 2014 | Aug. 31, 2017 | Aug. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 |
Leases [Abstract] | |||||||||
Rent per month | $ 6 | $ 24 | $ 16 | ||||||
Lease expiration date | Dec. 31, 2022 | Dec. 31, 2022 | Jul. 31, 2017 | ||||||
Renewal term | 5 years | 5 years | |||||||
Rent expense | $ 252 | $ 126 | $ 71 |
Lease Obligations - Schedule of
Lease Obligations - Schedule of Minimum Future Rental Payments on Noncancelable Operating Leases (Details) $ in Thousands | Dec. 31, 2017USD ($) |
Leases [Abstract] | |
2,018 | $ 294 |
2,019 | 303 |
2,020 | 312 |
2,021 | 321 |
2,022 | 331 |
Total minimum future rentals | $ 1,561 |
Capitalization - Additional Inf
Capitalization - Additional Information (Details) | May 22, 2017USD ($)$ / sharesshares | Dec. 31, 2015USD ($)$ / sharesshares | Feb. 28, 2015USD ($)$ / sharesshares | May 31, 2014USD ($)$ / sharesshares | Dec. 31, 2017USD ($)Patient$ / sharesshares | Dec. 31, 2016USD ($)$ / sharesshares | Jun. 30, 2016USD ($)$ / sharesshares | Apr. 30, 2016shares |
Schedule Of Capitalization [Line Items] | ||||||||
Cancellation of Indebtedness | $ | $ 39,000 | |||||||
Number of aggregate shares committed by purchasers | 48,666 | |||||||
Proceeds from initial public offering, net of underwriting discounts and commissions | $ | $ 108,503,000 | |||||||
Reverse stock split description | In connection with the IPO, the Board of Directors and the stockholders of the Company approved a one-for-three reverse stock split of the Company’s common stock. | |||||||
Reverse stock split ratio | 0.33 | |||||||
Reverse stock split effective date | May 11, 2017 | |||||||
Undesignated preferred stock, shares authorized to issue | 5,000,000 | |||||||
Preferred stock, shares issued | 0 | |||||||
Preferred stock, shares outstanding | 0 | |||||||
Common stock, par value | $ / shares | $ 0.0001 | $ 0.0001 | ||||||
Common stock, shares authorized | 120,000,000 | 73,000,000 | ||||||
Common Stock Voting Rights | Holders of common stock are entitled to one vote per share | |||||||
Series B Purchase Option | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Free-standing instrument exercised date | Dec. 10, 2015 | |||||||
Outstanding liability | $ | $ 0 | |||||||
Estimated volatility range, minimum | 68.00% | |||||||
Estimated volatility range, maximum | 71.00% | |||||||
Risk free interest rate, minimum | 0.47% | |||||||
Risk free interest rate, maximum | 0.94% | |||||||
Estimated life of purchase option | 2 years | |||||||
IPO | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Number of aggregate shares committed by purchasers | 7,781,564 | |||||||
Common stock, price per share | $ / shares | $ 15 | |||||||
Gross proceeds from issuance of common stock | $ | $ 116,700,000 | |||||||
Proceeds from initial public offering, net of underwriting discounts and commissions | $ | $ 107,100,000 | |||||||
Underwriters Option to Purchase | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Number of aggregate shares committed by purchasers | 781,564 | |||||||
Fourth Amended and Restated Certification of Incorporation | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Cancellation of Indebtedness | $ | $ 12,000 | |||||||
Certificate of Amendment | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Additional proceeds amount | $ | $ 16,750,000 | |||||||
Fifth Amended and Restated Certification of Incorporation | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares authorized | 57,108,717 | |||||||
Additional proceeds amount | $ | $ 50,000,000 | |||||||
Series A Redeemable Convertible Preferred Stock | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares issued | 2,495,663 | 0 | 4,998,895 | |||||
Preferred stock, par value | $ / shares | $ 2.52 | $ 0.0001 | $ 0.0001 | |||||
Proceeds from shares issued including cancellation of indebtedness, total | $ | $ 6,289,000 | |||||||
Preferred stock, shares authorized | 0 | 14,996,692 | ||||||
Series A Redeemable Convertible Preferred Stock | Fourth Amended and Restated Certification of Incorporation | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares authorized | 14,996,692 | |||||||
Series A Redeemable Convertible Preferred Stock | Certificate of Amendment | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares authorized | 14,996,692 | |||||||
Series A Redeemable Convertible Preferred Stock | Fifth Amended and Restated Certification of Incorporation | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares authorized | 14,996,692 | |||||||
Redeemable Convertible Preferred Stock | Fourth Amended and Restated Certification of Incorporation | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares authorized | 39,908,717 | |||||||
Redeemable Convertible Preferred Stock | Certificate of Amendment | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares authorized | 40,108,717 | |||||||
Series 1 Redeemable Convertible Preferred Stock | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares issued | 0 | 682,026 | ||||||
Preferred stock, par value | $ / shares | $ 0.0001 | $ 0.0001 | ||||||
Preferred stock, shares authorized | 0 | 2,112,025 | ||||||
Series 1 Redeemable Convertible Preferred Stock | Fourth Amended and Restated Certification of Incorporation | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares authorized | 2,112,025 | |||||||
Series 1 Redeemable Convertible Preferred Stock | Certificate of Amendment | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares authorized | 2,112,025 | |||||||
Series 1 Redeemable Convertible Preferred Stock | Fifth Amended and Restated Certification of Incorporation | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares authorized | 2,112,025 | |||||||
Series B Redeemable Convertible Preferred Stock | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares issued | 0 | 7,642,734 | ||||||
Preferred stock, par value | $ / shares | $ 0.0001 | $ 0.0001 | ||||||
Preferred stock, shares authorized | 0 | 23,000,000 | ||||||
Number of aggregate shares committed by purchasers | 3,791,272 | |||||||
Price per share | $ / shares | $ 4.3521 | |||||||
Number of patients for clinical trial | Patient | 10 | |||||||
Percentage of redeemable convertible preferred stock outstanding | 60.00% | |||||||
Description for milestone to be achieved | Each purchaser also had the option, but not the obligation, to purchase all of its allocation of the Second Tranche Shares at any time prior to the earlier to occur of (i) the second closing, and (ii) 12 months after the initial closing. | |||||||
Series B Redeemable Convertible Preferred Stock | Fourth Amended and Restated Certification of Incorporation | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares issued | 3,794,024 | |||||||
Proceeds from shares issued including cancellation of indebtedness, total | $ | $ 16,512,000 | |||||||
Preferred stock, shares authorized | 22,800,000 | |||||||
Preferred stock, price per shares | $ / shares | $ 4.3521 | |||||||
Series B Redeemable Convertible Preferred Stock | Certificate of Amendment | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares issued | 3,848,710 | |||||||
Preferred stock, shares authorized | 23,000,000 | |||||||
Preferred stock, price per shares | $ / shares | $ 4.3521 | |||||||
Additional preferred stock, shares authorized | 11,546,147 | |||||||
Series B Redeemable Convertible Preferred Stock | Fifth Amended and Restated Certification of Incorporation | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares authorized | 23,000,000 | |||||||
Series C Redeemable Convertible Preferred Stock | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares issued | 0 | 5,609,398 | ||||||
Preferred stock, par value | $ / shares | $ 0.0001 | $ 0.0001 | ||||||
Preferred stock, shares authorized | 0 | 17,000,000 | ||||||
Series C Redeemable Convertible Preferred Stock | Fifth Amended and Restated Certification of Incorporation | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Preferred stock, shares issued | 5,609,398 | |||||||
Preferred stock, shares authorized | 16,828,217 | 17,000,000 | ||||||
Preferred stock, price per shares | $ / shares | $ 8.91 | |||||||
Convertible Preferred Stock | IPO | ||||||||
Schedule Of Capitalization [Line Items] | ||||||||
Conversion of outstanding preferred stock to common stock | 18,933,053 |
Capitalization - Summary of com
Capitalization - Summary of common stock shares reserved for future issuance (Details) - shares | Dec. 31, 2017 | Dec. 31, 2016 |
Schedule Of Capitalization [Line Items] | ||
Common stock, shares reserved for future issuance | 5,719,020 | 22,842,140 |
Conversion of Series C Preferred Stock On A Fully-Diluted Basis | ||
Schedule Of Capitalization [Line Items] | ||
Common stock, shares reserved for future issuance | 5,609,398 | |
Conversion of Series B Preferred Stock On A Fully-Diluted Basis | ||
Schedule Of Capitalization [Line Items] | ||
Common stock, shares reserved for future issuance | 7,642,734 | |
Conversion of Series A Preferred Stock On A Fully-Diluted Basis | ||
Schedule Of Capitalization [Line Items] | ||
Common stock, shares reserved for future issuance | 4,998,895 | |
Conversion of Series 1 Preferred Stock On A Fully-Diluted Basis | ||
Schedule Of Capitalization [Line Items] | ||
Common stock, shares reserved for future issuance | 682,026 | |
Common Stock Warrants Issued With Promissory Notes | ||
Schedule Of Capitalization [Line Items] | ||
Common stock, shares reserved for future issuance | 16,666 | |
Other Common Stock Warrants | ||
Schedule Of Capitalization [Line Items] | ||
Common stock, shares reserved for future issuance | 3,466 | |
Series 1 Preferred Stock Warrants Issued With Promissory Notes | ||
Schedule Of Capitalization [Line Items] | ||
Common stock, shares reserved for future issuance | 21,978 | |
Common Stock Options Outstanding | ||
Schedule Of Capitalization [Line Items] | ||
Common stock, shares reserved for future issuance | 4,116,333 | 3,690,058 |
Options Available For Grant Under Equity Incentive Plan | ||
Schedule Of Capitalization [Line Items] | ||
Common stock, shares reserved for future issuance | 1,602,687 | 176,919 |
Stock option plan - Additional
Stock option plan - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | May 16, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | May 31, 2017 | Sep. 07, 2015 | Jul. 15, 2015 | Feb. 27, 2015 | Mar. 31, 2011 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||||||||
Stock-based compensation | $ 3,394 | $ 1,391 | $ 389 | ||||||
Granted | 688,997 | ||||||||
Employee Stock Options | |||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||||||||
Stock-based compensation | $ 1,772 | $ 907 | 180 | ||||||
Unrecognized stock-based compensation costs | $ 10,404 | ||||||||
Weighted-average recognition period | 2 years 11 months 4 days | ||||||||
Share Price | $ 2.73 | $ 2.40 | $ 0.75 | ||||||
Granted | 119,997 | 1,099,320 | |||||||
Non-employee Stock Options | |||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||||||||
Stock-based compensation | $ 1,622 | $ 484 | $ 209 | ||||||
2011 Equity Incentive Plan | |||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||||||||
Number of shares approved for grant under equity incentive plan | 4,400,640 | ||||||||
Number of shares available for grant under equity incentive plan | 0 | ||||||||
2017 Equity Incentive Plan | |||||||||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||||||||
Number of shares approved for grant under equity incentive plan | 1,932,000 | ||||||||
Number of shares available for grant under equity incentive plan | 1,602,687 | ||||||||
Stock options, maximum term | 10 years |
Stock option plan - Summary of
Stock option plan - Summary of Share-Based Compensation Expense Included in the Consolidated Statement of Operations (Details) - Employee and Non-employee Stock Options - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
Total stock-based compensation expense | $ 3,394 | $ 1,391 | $ 389 |
Research and development | |||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
Total stock-based compensation expense | 2,531 | 911 | 221 |
General and administrative | |||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
Total stock-based compensation expense | $ 863 | $ 480 | $ 168 |
Stock option plan - Fair Value
Stock option plan - Fair Value of Stock Options Granted Using Black-Scholes Options Pricing Model (Details) - Employee and Non-employee Stock Options - $ / shares | 12 Months Ended | ||
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
Expected volatility, minimum | 74.20% | 74.80% | 66.80% |
Expected volatility, maximum | 79.30% | 83.90% | 69.30% |
Weighted-average risk free rate, minimum | 1.90% | 1.20% | 1.50% |
Weighted-average risk free rate, maximum | 2.20% | 2.10% | 1.70% |
Expected term (in years) | 6 years 3 days | 6 years 4 months 24 days | 6 years 6 months 21 days |
Weighted-average grant-date fair value per share | $ 10.71 | $ 3.24 | $ 1.59 |
Stock option plan - Summary o46
Stock option plan - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended | |
Dec. 31, 2017 | Dec. 31, 2016 | |
Options outstanding | ||
Beginning balance | 3,690,058 | |
Cancelled | (89,687) | |
Granted | 688,997 | |
Exercised | (173,035) | |
Ending balance | 4,116,333 | 3,690,058 |
Exercisable | 2,225,970 | |
Vested and expected to vest | 4,116,333 | |
Weighted average exercise price | ||
Beginning balance | $ 2.13 | |
Cancelled | 3.81 | |
Granted | 15.96 | |
Exercised | 2.24 | |
Ending balance | 4.41 | $ 2.13 |
Exercisable | 1.64 | |
Vested and expected to vest | $ 4.41 | |
Weighted average, Remaining contractual for life (Years) | ||
Balance | 7 years 9 months 18 days | 8 years 4 months 24 days |
Exercisable | 7 years 2 months 12 days | |
Vested and expected to vest | 7 years 9 months 18 days | |
Weighted average, Aggregate intrinsic value | ||
Balance | $ 63,577 | $ 17,463 |
Exercisable | 40,523 | |
Vested and expected to vest | $ 63,577 |
Net Loss Per Common Share (Deta
Net Loss Per Common Share (Details) - shares | 12 Months Ended | ||
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | |||
Potentially dilutive securities excluded from computations of diluted weighted-average shares outstanding | 3,849,743 | 3,250,126 | 1,892,769 |
Employee and Non-employee Stock Options | |||
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | |||
Potentially dilutive securities excluded from computations of diluted weighted-average shares outstanding | 3,838,358 | 3,224,682 | 1,867,325 |
Stock Warrants | |||
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | |||
Potentially dilutive securities excluded from computations of diluted weighted-average shares outstanding | 11,385 | 25,444 | 25,444 |
Income Taxes - Additional Infor
Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended | |||
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | |
Income Taxes [Line Items] | ||||
Unrecognized income tax benefits | $ 0 | $ 0 | ||
Unrecognized income tax benefits impact on effective income tax rate | 0 | 0 | ||
Accrued income taxes | $ 0 | $ 0 | ||
U.S. statutory income tax rate | 34.00% | 34.00% | 34.00% | |
Valuation allowance | $ 29,887,000 | $ 20,910,000 | ||
Effect on provisional charge for revaluation of deferred tax assets | 14,770,000 | |||
Scenario, Forecast | ||||
Income Taxes [Line Items] | ||||
U.S. statutory income tax rate | 21.00% | |||
Percentage of limitations on NOL carryforwards to taxable income | 80.00% | |||
Federal | ||||
Income Taxes [Line Items] | ||||
Net operating loss carryforwards | $ 100,795,000 | |||
Net operating loss carryforwards expiration year | 2,028 | |||
State | ||||
Income Taxes [Line Items] | ||||
Net operating loss carryforwards | $ 100,793,000 | |||
Net operating loss carryforwards expiration year | 2,023 |
Income Taxes - Summary of Diffe
Income Taxes - Summary of Differences Between the Income Tax Expense Attributable to Continuing Operation and the Expense Computed at U.S. Statutory Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | |
Income Tax Disclosure [Abstract] | |||
Federal income tax expense at statutory rate: | $ (20,441) | $ (10,299) | $ (6,890) |
Increase (reduction) in income tax resulting from: | |||
State Income Taxes | (1,623) | (397) | (335) |
Increase in Valuation Allowance | 8,977 | 10,936 | 6,109 |
Increase in fair value of Series B purchase option liability | 1,623 | ||
Equity Financing Expenses | 39 | 371 | |
Stock Compensation | 152 | 200 | 48 |
Research and Development Credit | (1,882) | (803) | (509) |
Effect on Tax Cuts & Job Acts Rate Reduction | 14,770 | ||
Other | $ 8 | $ (8) | $ (46) |
Income Taxes - Components of Ta
Income Taxes - Components of Tax Effects of Temporary Differences and Operating Loss Carryforwards Including Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 |
Deferred tax assets | ||
Accrued expenses | $ 1,412 | $ 751 |
Deferred rent | 20 | 16 |
Stock compensation | 360 | 386 |
Charitable contributions | 2 | 1 |
Capitalized patents and licenses | 1,225 | 1,474 |
R&D credits | 3,333 | 1,451 |
Net operating loss carryforwards | 23,556 | 16,844 |
Deferred tax assets | 29,908 | 20,923 |
Deferred tax liabilities | ||
Property, plant and equipment, primarily due to differences in depreciation | (21) | (13) |
Deferred tax liabilities | (21) | (13) |
Valuation allowance | $ (29,887) | $ (20,910) |
Income Taxes - Summary of Chang
Income Taxes - Summary of Changes in the Deferred Tax Valuation Allowance (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | |
Valuation Allowance [Line Items] | |||
Balance at beginning of year | $ 20,910 | $ 9,974 | $ 3,865 |
Charges to costs and expenses | 8,977 | 10,936 | 6,109 |
Balance at end of year | $ 29,887 | $ 20,910 | $ 9,974 |
Related Party Transactions - Ad
Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended | ||
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | |
Founders | |||
Related Party Transaction [Line Items] | |||
Consulting agreements completion date | Jun. 30, 2017 | ||
Consulting agreements renewal date | Jun. 30, 2019 | ||
Consulting fees | $ 64 | $ 108 | $ 104 |
Consulting Services | Chairman of the Board of Directors | |||
Related Party Transaction [Line Items] | |||
Consulting fees | $ 11 | $ 14 | $ 20 |
Quarterly Financial Information
Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended | |||||||||
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | |
Quarterly Financial Information Disclosure [Abstract] | |||||||||||
Total operating expenses | $ 17,282 | $ 15,929 | $ 15,379 | $ 12,378 | $ 10,403 | $ 6,613 | $ 7,429 | $ 5,946 | $ 60,968 | $ 30,391 | $ 15,946 |
Operating loss | (17,282) | (15,929) | (15,379) | (12,378) | (10,403) | (6,613) | (7,429) | (5,946) | (60,968) | (30,391) | (15,424) |
Total other income (expense), net | 301 | 328 | 185 | 33 | 2 | 56 | 50 | (8) | 847 | 100 | (4,839) |
Net loss | (16,981) | (15,601) | (15,194) | (12,345) | (10,401) | (6,557) | (7,379) | (5,954) | (60,121) | (30,291) | (20,263) |
Accretion of redeemable convertible preferred stock | (289) | (4,468) | (1,205) | (1,205) | (986) | (1,009) | (4,757) | (4,405) | (1,427) | ||
Net loss attributable to common stockholders | $ (16,981) | $ (15,601) | $ (15,483) | $ (16,813) | $ (11,606) | $ (7,762) | $ (8,365) | $ (6,963) | $ (64,878) | $ (34,696) | $ (21,690) |
Net loss per share attributable to common stockholders, basic and diluted | $ (0.60) | $ (0.55) | $ (1.09) | $ (11.24) | $ (7.77) | $ (5.21) | $ (5.63) | $ (4.71) | $ (3.57) | $ (23.33) | $ (16.13) |
Weighted average common shares outstanding, basic and diluted | 28,362,323 | 28,318,656 | 14,208,115 | 1,496,336 | 1,493,753 | 1,490,552 | 1,486,303 | 1,447,219 | 18,197,970 | 1,486,986 | 1,344,584 |
Subsequent Events - Additional
Subsequent Events - Additional Information (Details) | Jan. 31, 2018ft² |
Subsequent Event | |
Subsequent Event [Line Items] | |
Additional office space lease to secure | 6,395 |