Commitments and Contingencies (Details) $ in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2015 USD ($) ft²	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Aug. 31, 2015 USD ($)	Jul. 31, 2015 USD ($)
Operating Leases
Rent expense		$ 2.1	$ 1.8
Standby letters of credit		4.0
Standby letters of credit, increase		$ 2.2
Office location in Houston, Texas
Operating Leases
Future minimum non-cancelable lease payments				$ 7.0	$ 1.8
Future minimum non-cancelable lease payments including landlord incentive				9.9
Landlord incentive				2.9
Office location in Houston, Texas | Minimum
Operating Leases
Base annual rent expense				1.3
Office location in Houston, Texas | Maximum
Operating Leases
Base annual rent expense				$ 1.5
Office location in Singapore | Forecast
Operating Leases
Future minimum non-cancelable lease payments	$ 3.1
Base annual rent expense	$ 0.6
Initial term of lease	60 months
Area of office space (in square feet) | ft²	11,343
Extension period of lease term	36 months
Capital expenditures | Office location in Singapore | Forecast
Operating Leases
Aggregate capital expenditures with respect to the leased premises to be paid in 2016	$ 1.1