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Private Placement (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 28, 2019 | Aug. 06, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Equity [Abstract] |  |  |  |  |
Number of shares issued (in shares) |  | 12,062,000 |  |  |
Common stock, par value (in dollars per share) |  | $ 0.001 | $ 0.001 |  | $ 0.001
Number of additional shares from warrants (in shares) | 2,500,000 | 4,221,700 |  |  |
Gross proceeds |  | $ 19,700 |  |  |
Stock issuance costs |  | $ 500 |  |  |
Initial exercise price of warrants (in dollars per share) | $ 7.00 | $ 2.52 |  |  |
Proceeds from the exercise of warrant to purchase common stock | $ 10,600 |  | $ 10,639 | $ 0 |

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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://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)(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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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