Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - 2014 Equity Incentive Plan (Details)

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Stock-based Compensation - 2014 Equity Incentive Plan (Details) - 2014 Equity Incentive Plan - shares
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share-based compensation arrangement by share-based payment award, number of additional shares authorized 1,918,879 1,158,866
Possible future issuance under equity compensation plan (in shares) 265,156