Leases (Detail Textuals) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Lessor, Lease, Description [Line Items]      
Adjustment to retained earnings     $ 0
Lease extend term   3 years  
Remaining lease terms 1 year 1 year  
Term of sales-type lease on solar systems 20 years 20 years  
Sales-type lease extend term   one or more additional one-year renewal terms  
Amount of expects to derive from underlying solar panels   $ 300  
Operating lease costs $ 300 600  
Cash Paid For Lease Liabilities 300 600  
Operating lease right-of-use asset 1,464 1,464  
Additions to right-of-use assets arising from operating lease liabilities   2,400  
Lease receivables 1,500 1,500  
Unguaranteed residual assets 300 300  
Initial direct cost   80  
Deferred operations and maintenance ("O&M") expense   60  
Unearned revenue   600  
Non-current assets      
Lessor, Lease, Description [Line Items]      
Operating lease right-of-use asset 2,400 2,400  
Current liabilities      
Lessor, Lease, Description [Line Items]      
Operating lease right-of-use asset 300 300  
Non-current liabilities      
Lessor, Lease, Description [Line Items]      
Operating lease right-of-use asset $ 2,000 $ 2,000  
Maximum      
Lessor, Lease, Description [Line Items]      
Remaining lease terms 5 years 5 years  
Minimum      
Lessor, Lease, Description [Line Items]      
Remaining lease terms 1 year 1 year