Summary of Significant Accounting Policies - Sale-Leaseback (Details) |
3 Months Ended | |||
|---|---|---|---|---|
|
Mar. 31, 2019
USD ($)
project
|
Mar. 31, 2018
USD ($)
project
|
Sep. 30, 2018
USD ($)
|
Sep. 30, 2016
USD ($)
|
|
| Sale Leaseback Transaction [Line Items] | ||||
| Net amortization expense | $ 57,000 | $ 59,000 | ||
| Solar Photovoltaic Projects | ||||
| Sale Leaseback Transaction [Line Items] | ||||
| Maximum combined funding amount | $ 100,000,000 | $ 100,000,000 | ||
| Number of solar PV projects sold | project | 0 | 0 | ||
| Percentage of fair value threshold, integral equipment | 10.00% | |||
| X | ||||||||||
- Definition Maximum Combined Funding Amount, Sale Leaseback Transactions No definition available.
|
| X | ||||||||||
- Definition Percentage of Fair Value Threshold, Integral Equipment No definition available.
|
| X | ||||||||||
- Definition Sale Leaseback Transaction, Net Amortization Expense No definition available.
|
| X | ||||||||||
- Definition Sale Leaseback Transaction, Number of Projects Sold No definition available.
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
|