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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