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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 11, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Feb. 28, 2018
Subsequent Event [Line Items] |  |  |  |
Outstanding warrants to purchase (in shares) |  |  | 3,750,833 |
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Public offering price in the Offering (in usd per share) | $ 1.10 |  |  |
Gross proceeds received in public offering |  | $ 5.2 |  |
Public Stock Offering [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of shares issued in the Offering (in shares) | 4,575,000 |  |  |
Underwritten Offering [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Exercise price (in usd per share) |  |  |  | $ 3.00
Underwritten Offering [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of shares issued in the Offering (in shares) | 686,250 |  |  |
Public Stock Offering, Including Over-Allotment Of Shares [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of shares issued in the Offering (in shares) | 5,261,250 |  |  |
Gross proceeds received in public offering | $ 5.8 |  |  |
Proceeds received in public offering, net of underwriting discounts and offering expenses | $ 5.2 |  |  |
Warrants Expiring on February 15, 2023 [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Outstanding warrants to purchase (in shares) |  |  | 3,720,500 |
Exercise price (in usd per share) |  |  | $ 3.00 |
Warrants Expiring on February 15, 2023 [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Public offering price in the Offering (in usd per share) | $ 0.98 |  |  |
Exercise price (in usd per share) | $ 0.98 |  |  |

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- Definition Number of warrants or rights outstanding. + References Reference 1: 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 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + 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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