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Common Stock (Tables) | 9 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Summary of Stock Options Activity | Stock option transactions and the number of stock options outstanding are summarized below:
|  | Number of |  |  | Weighted |
|  | Optioned |  |  | Average |
|  | Common |  |  | Exercise |
|  | Shares |  |  | Price |
Balance, December 31, 2016 |  |  | — |  |  | $ | — |
Additions from OncoGenex Plans |  |  | 113,451 |  |  |  | 92.61 |
Granted |  |  | 1,052,200 |  |  |  | 2.89 |
Expired |  |  | (19,544 | ) |  |  | 114.53 |
Forfeited |  |  | — |  |  |  | — |
Balance, September 30, 2017 |  |  | 1,146,107 |  |  | $ | 9.87 |
Summary of Fair Value of Option Awards | The fair value of each stock award for employees and directors is estimated on the grant date and for consultants at each reporting period, using the Black-Scholes option-pricing model based on the weighted-average assumptions. For the nine months ended September 30, 2017, the weighted-average assumptions used in the Black-Scholes option-pricing model are noted in the following table. No stock options were granted during the nine months ended September 30, 2016:
|  | Nine Months Ended
|  | September 30,
|  | 2017 |  |
Risk-free interest rates |  |  | 1.95 | % |
Expected dividend yield |  |  | 0 | % |
Expected life |  |  | 6.00 |  |
Expected volatility |  |  | 86.06 | % |
Summary of Share-Based Compensation Expense | The results for the periods set forth below included share-based compensation expense for stock options and restricted stock units in the following expense categories of the consolidated statements of loss (in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Research and development |  | $ | 43 |  |  | $ | — |  |  | $ | 43 |  |  | $ | — |
General and administrative |  | $ | 109 |  |  |  | — |  |  |  | 109 |  |  |  | — |
Total stock-based compensation |  | $ | 152 |  |  | $ | — |  |  | $ | 152 |  |  | $ | — |
Summary of Restricted Stock Unit Award Activity | The following table summarizes our restricted stock unit award activity during the nine months ended September 30, 2017:
|  |  |  |  |  | Weighted |
|  | Number |  |  | Average |
|  | of |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Balance, December 31, 2016 |  |  | — |  |  | $ | — |
Additions from OncoGenex Plans |  |  | 10,543 |  |  |  | 41.14 |
Granted |  |  | 205,100 |  |  |  | 2.89 |
Released |  |  | (5,208 | ) |  |  | 44.36 |
Forfeited or expired |  |  | (19 | ) |  |  | 51.91 |
Balance, September 30, 2017 |  |  | 210,416 |  |  | $ | 3.78 |
Summary of Outstanding Warrants | The following is a summary of outstanding warrants to purchase common stock at September 30, 2017:
|  | Total |  |  |  |  |  |  |
|  | Outstanding |  |  | Exercise |  |  |
|  | and |  |  | price per |  |  |
|  | Exercisable |  |  | Share |  |  | Expiration Date
(1) Series A Warrants issued in July 2014 financing |  |  | 252,721 |  |  |  | 44.000 |  |  | July 2019
(2) Series B Warrants issued in July 2014 financing |  |  | 60,933 |  |  |  | 44.000 |  |  | July 2019
(3) Series A-1 Warrants issued in April 2015 financing |  |  | 21,748 |  |  |  | 26.400 |  |  | October 2020
(4) Warrants issued in September 2017 financing |  |  | 82,237 |  |  |  | 3.496 |  |  | March 2023
Summary of Fair Value of Warrants Issued | The estimated fair value of warrants classified as liabilities is reassessed at each reporting date using the Black-Scholes pricing model.
|  | As of |
|  | September 30, |
Series A and Series B Warrant Valuation Assumptions |  | 2017 |
Risk-free interest rates |  |  | 1.42 | %
Expected dividend yield |  |  | 0 | %
Expected life |  | 1.75 years |
Expected volatility |  |  | 86.06 | %

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of warrants issued, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends and (d) risk-free rate(s). + References No definition available. + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 + Details
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