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Preferred and Common Stock Warrants (Tables) | 3 Months Ended
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Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Warrant to Purchase Redeemable Convertible Preferred Stock | As of March 31, 2019, the Company’s outstanding warrants to purchase shares of common stock consisted of the following:
Issuance Date |  | Number of Shares of Common Stock Issuable |  |  | Exercise Price |  |  | Classification |  |  | Expiration Date |
August 14, 2015 |  |  | 81,228 |  |  | $ | 21.78 |  |  |  | Equity |  |  |  | August 14, 2020 |
August 21, 2015 |  |  | 69,603 |  |  | $ | 21.78 |  |  |  | Equity |  |  |  | August 21, 2020 |
October 25, 2016 |  |  | 5,155 |  |  | $ | 19.78 |  |  |  | Equity |  |  |  | October 24, 2026 |
November 1, 2017 |  |  | 130,609 |  |  | $ | 19.78 |  |  |  | Equity |  |  |  | October 31, 2020 |
November 17, 2017 |  |  | 8,442 |  |  | $ | 19.78 |  |  |  | Equity |  |  |  | November 16, 2020 |
December 4, 2017 |  |  | 5,661 |  |  | $ | 19.78 |  |  |  | Equity |  |  |  | December 3, 2020 |
December 28, 2017 |  |  | 6,925 |  |  | $ | 19.78 |  |  |  | Equity |  |  |  | December 27, 2020 |
December 28, 2017 |  |  | 115,916 |  |  | $ | 19.78 |  |  |  | Equity |  |  |  | December 28, 2027 |
September 12, 2018 |  |  | 25,275 |  |  | $ | 19.78 |  |  |  | Equity |  |  |  | September 12, 2021 |
September 12, 2018 |  |  | 20,220 |  |  | $ | 19.78 |  |  |  | Equity |  |  |  | September 12, 2028 |
October 19, 2018 |  |  | 20,016 |  |  | $ | 19.78 |  |  |  | Equity |  |  |  | October 19, 2028 |
December 11, 2018 |  |  | 5,004 |  |  | $ | 19.80 |  |  |  | Equity |  |  |  | October 19, 2028 |
|  |  | 494,054 |  |  |  |  |  |  |  |  |  |  |  |  |
As of December 31, 2018, the Company’s outstanding warrants to purchase shares of preferred stock (which converted into warrants to purchase common stock upon close of the Merger) consisted of the following (not adjusted for the Reverse Stock Split or Exchange Ratio):
December 31, 2018 |
Warrant Name |  | Issuance Date |  |  | Number of Shares of Preferred Stock Issuable |  |  | Exercise Price |  |  | Exercisable for |  |  | Classification |  |  | Expiration Date |
Series A warrants |  |  | August 14, 2015 |  |  |  | 854,785 |  |  | $ | 2.07 |  |  |  | Series A |  |  |  | Liability |  |  |  | August 14, 2020 |
Series A warrants |  |  | August 21, 2015 |  |  |  | 732,453 |  |  | $ | 2.07 |  |  |  | Series A |  |  |  | Liability |  |  |  | August 21, 2020 |
SVB warrants |  |  | October 25, 2016 |  |  |  | 54,256 |  |  | $ | 1.88 |  |  |  | Series A |  |  |  | Liability |  |  |  | October 24, 2026 |
Series B warrants |  |  | November 1, 2017 |  |  |  | 1,374,435 |  |  | $ | 1.88 |  |  |  | Series B |  |  |  | Liability |  |  |  | October 31, 2020 |
Series B warrants |  |  | November 17, 2017 |  |  |  | 88,845 |  |  | $ | 1.88 |  |  |  | Series B |  |  |  | Liability |  |  |  | November 16, 2020 |
Series B warrants |  |  | December 4, 2017 |  |  |  | 59,576 |  |  | $ | 1.88 |  |  |  | Series B |  |  |  | Liability |  |  |  | December 3, 2020 |
Series B warrants |  |  | December 28, 2017 |  |  |  | 72,875 |  |  | $ | 1.88 |  |  |  | Series B |  |  |  | Liability |  |  |  | December 27, 2020 |
Series B warrants |  |  | December 28, 2017 |  |  |  | 1,219,815 |  |  | $ | 1.88 |  |  |  | Series B |  |  |  | Liability |  |  |  | December 28, 2027 |
Series B warrants |  |  | September 12, 2018 |  |  |  | 265,957 |  |  | $ | 1.88 |  |  |  | Series B |  |  |  | Liability |  |  |  | September 12, 2021 |
Series B warrants |  |  | September 12, 2018 |  |  |  | 212,765 |  |  | $ | 1.88 |  |  |  | Series B |  |  |  | Liability |  |  |  | September 12, 2028 |
Series B warrants |  |  | October 19, 2018 |  |  |  | 210,638 |  |  | $ | 1.88 |  |  |  | Series B |  |  |  | Liability |  |  |  | October 19, 2028 |
|  |  |  |  |  |  | 5,146,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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