Notes Payable (Details) $ / shares in Units, $ in Thousands |
6 Months Ended | |||
|---|---|---|---|---|
|
Oct. 15, 2013
USD ($)
|
Jun. 30, 2018
USD ($)
$ / shares
|
Dec. 31, 2017
$ / shares
|
Oct. 23, 2013
item
|
|
| Notes Payable | ||||
| Class Of Warrant Or Right, Exercise Price Of Warrants Or Rights | $ / shares | $ 0.95 | $ 0.97 | ||
| Sweetwater IDR Bond [Member] | ||||
| Notes Payable | ||||
| Proceeds from Issuance of Long-term Debt | $ 34,000 | |||
| Periodic payment amount | $ 17,478 | |||
| Due Quarterly Commencing From January 1, 2014 [Member] | Sweetwater IDR Bond [Member] | ||||
| Notes Payable | ||||
| Fixed interest rate (as a percent) | 5.75% | |||
| Due Quarterly Commencing From January 1, 2015 [Member] | Sweetwater IDR Bond [Member] | ||||
| Notes Payable | ||||
| Number of installments | item | 28 |
| X | ||||||||||
- Definition Represents the total number of installment payments to be made on the debt instrument. No definition available.
|
| X | ||||||||||
- Definition Exercise price per share or per unit of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| 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 | ||||||||||
- Definition Amount of the required periodic payments applied to principal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|