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Warrants | 6 Months Ended
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Jun. 30, 2019
Other Liabilities Disclosure [Abstract] |
Warrants | Warrants The table below summarizes common stock warrants issued and outstanding at both June 30, 2019 and December 31, 2018 (in thousands, except share and per share data):
Date |  | Number of Shares Underlying Warrants |  | Price per Share |  | Fair Value |
Issuance |  | Expiration |  |  |
3/1/2017 |  | 3/1/2027 | [a] | 1,388 |  | $ | 5.94 |  |  | $ | 5 |  | [b]
7/19/2013 |  | 7/22/2023 | [a] | 32,983 |  | 9.10 |  |  | 122 |  | [b]
11/26/2014 |  | 11/26/2024 | [a] | 6,680 |  | 16.47 |  |  | 49 |  | [b]
10/20/2015 |  | 10/20/2025 | [a] | 41,650 |  | 16.47 |  |  | 396 |  | [c]
11/9/2015 |  | 11/9/2025 | [a] | 25,709 |  | 16.47 |  |  | 244 |  | [c]
12/22/2016 |  | 12/22/2026 | [a] | 9,712 |  | 10.03 |  |  | 45 |  | [c]
|  |  |  | 118,122 |  |  |  | $ | 861 |  |
[a] | Common stock warrants will remain outstanding until the earlier of the expiration date or the date exercised by the holder.
[b] | Fair value at the date of issuance.
[c] Fair value at the date of conversion from redeemable convertible preferred stock to common stock warrants in conjunction with the IPO on October 16, 2018.

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- Definition The entire disclosure for other liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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