Equity and Stock-Based Compensation (Stock based compensation plan) (Details)	Sep. 30, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available (in shares)	793,632
Options outstanding (in shares)	1,560,441
2007 Employee Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)	3,000,000
Shares available (in shares)	686,032
Options outstanding (in shares)	1,342,391
1998 Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)	500,000
Shares available (in shares)	0
Options outstanding (in shares)	0
Non-Employee Directors Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)	500,000
Shares available (in shares)	107,600
Options outstanding (in shares)	218,050