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Summary of Business and Significant Accounting Policies - Follow-on Offering (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 2 Months Ended
--- | --- | ---
Apr. 30, 2019 | Mar. 31, 2019 | Apr. 30, 2019
Stock offering |  |  |
Accrued stock issuance fees |  | $ 185 |
Follow-on offering |  |  |
Stock offering |  |  |
Issuance of common stock |  | 2,000 |
Share Price |  | $ 11.00 |
Proceeds from follow-on public offering, net of issuance costs |  |  | $ 21,700
Underwriter commission incurred |  |  | 1,600
Other offering costs |  |  | $ 282
Over-allotment |  |  |
Stock offering |  |  |
Issuance of common stock | 149 |  |

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