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Subsequent Event (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 06, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Subsequent Event [Line Items] |  |  |  |
Stock options granted |  |  | 1,795,642 | 3,877,000
Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of shares issued (in shares) | 12,062,000 |  |  |
Number of additional shares from warrants (in shares) | 4,221,700 |  |  |
Gross proceeds | $ 19.7 |  |  |
Initial exercise price of warrants (in dollars per share) | $ 2.52 |  |  |
Stock options granted |  | 2,368,750 |  |
Restricted Stock Units (RSUs) |  |  |  |
Subsequent Event [Line Items] |  |  |  |
RSUs granted |  |  | 384,912 | 1,480,301
Restricted Stock Units (RSUs) | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
RSUs granted |  | 466,500 |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + 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)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
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- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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- Details
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