Fair Value Measurements - Reconciliation of Assets and Liabilities Measured Using Significant Unobservable Inputs (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2016 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total, period start	$ 6,207
Change in fair value, total	38
Total, period end	6,245
Convertible Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at September 30, 2014	5,337
Change in fair value	359
Balance at June 30, 2015	5,696
Stock Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at September 30, 2014	59
Change in fair value	(10)
Balance at June 30, 2015	49
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at September 30, 2015	811
Change in fair value	(311)
Balance at March 31, 2016	$ 500