Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Schedule of Stock-based Awards Granted (Details)

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Stock-Based Compensation - Schedule of Stock-based Awards Granted (Details) - 2007 Stock Incentive Plan - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares) 8,000 540,500 25,000 540,500
Restricted stock awards and restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity instruments other than options, granted (in shares) 98,196 180,000 196,688 180,000