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Stock-Based Compensation - Summary of Restricted Stock Units Activity (Details) - Unvested Restricted Stock Units
6 Months Ended
Jun. 30, 2019
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares Outstanding, Beginning, Unvested shares 24,960
Number of Shares Outstanding, Granted 0
Number of Shares Outstanding, Vested (6,240)
Number of Shares Outstanding, Ending, Unvested shares 18,720