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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares) 14,000 3,500 39,000 544,000
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) 25,900 0 222,588 180,000