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Debt - Convertible Debt (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2018 | Apr. 30, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Common stock acquired in exchange for warrants (in shares) |  |  | 412,667
Convertible Notes Payable | Convertible Promissory Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount |  |  | $ 1,000,000.0
Common stock acquired in exchange for warrants (in shares) |  |  | 412,667
Debt instrument, interest rate, stated percentage |  |  | 5.00%
Debt instrument, convertible, conversion price (in USD per share) |  |  | $ 7.00
Warrants and rights outstanding |  | $ 800,000 |
Conversion of units (in shares) |  | 118,644 |
Principal and interest expense, debt | $ 200,000 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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