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Share-based Payments - Summary of Outstanding Warrants (Details) - Warrants - $ / shares | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average exercise price (in dollars per share) | $ 0.26 | $ 0.26 | $ 0.22 | $ 0.26
Number of warrants (in shares) | 18,066,662 | 18,066,662 | 18,066,662 | 25,457,623
October 8 – 28, 2015 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average exercise price (in dollars per share) | $ 0.31 |  |  |
Number of warrants (in shares) | 2,976,610 |  |  |
May 13 – 27, 2016 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average exercise price (in dollars per share) | $ 0.25 |  |  |
Number of warrants (in shares) | 15,090,052 |  |  |

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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