Commitments and Contingencies - Litigation and Other Contingencies (Details) - 2007 Plan - USD ($)			1 Months Ended
	Apr. 28, 2017	Nov. 08, 2016	Sep. 30, 2015	Sep. 15, 2016	Oct. 31, 2014	Sep. 30, 2012	Sep. 30, 2009
Loss Contingencies [Line Items]
Stock options authorized under the plan (in shares)			4,950,000		3,950,000	2,450,000	1,650,000
Awarded value	$ 215,000
Proxy Statements | Pending Litigation
Loss Contingencies [Line Items]
Stock options authorized under the plan (in shares)				500,000
Mr. Bergera | Proxy Statements | Pending Litigation
Loss Contingencies [Line Items]
Excess options granted (in shares)		850,000
Mr. Bergera | Proxy Statements | Pending Litigation | Maximum
Loss Contingencies [Line Items]
Options granted (in shares)			1,350,000