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Proceeds from Exercise of Warrants for Preferred A-1 Shares - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Proceeds from Exercise of Warrants for Preferred Shares [Line Items] |  |
Proceeds from exercise of warrants for preferred shares | $ 382 | $ 570
Series A-1 Preferred Shares |  |
Proceeds from Exercise of Warrants for Preferred Shares [Line Items] |  |
Warrant exercise price per share | $ 7.81 |
Exercisable number of warrants for preferred shares | 728,312 |
Proceeds from exercise of warrants for preferred shares | $ 952 |

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- Definition Proceeds from exercise of warrants for preferred shares. + References No definition available. + Details
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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 The cash inflow associated with the amount received from holders exercising their stock warrants. + References No definition available. + Details
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- Details
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