Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Current assets:    
Cash $ 1,696 $ 5,831
Accounts receivable, net 985 1,340
Costs in excess of billings 92 11
Inventory, net 4,638 1,595
Deferred costs on uncompleted contracts 206 236
Other current assets 1,048 1,613
Total current assets 8,665 10,626
Property and equipment, net 635 778
POWERHOUSE license, net 3,245 3,202
Operating lease right-of-use asset 1,464  
Net investment in sales-type leases and other assets 1,476 1,654
Total assets 15,485 16,260
Current liabilities:    
Convertible debt, net   336
Accounts payable 2,444 862
Accrued liabilities 2,105 1,811
Operating lease liability 616  
Deferred revenue and other current liabilities 921 716
Total current liabilities 6,086 3,725
Other liabilities 954 1,242
Operating lease liability 894  
Common stock warrant liabilities 3,766 511
Total liabilities 11,700 5,478
Commitments and contingencies
Mezzanine equity:    
Redeemable placement agent common stock warrants 195  
Shareholders' equity:    
Preferred stock, par value $.0001 per share; 50,000,000 shares authorized; no shares issued and outstanding
Additional paid-in capital 255,715 253,331
Accumulated deficit (252,144) (242,566)
Total shareholders' equity 3,590 10,782
Total liabilities, mezzanine equity and shareholders' equity 15,485 16,260
Class A common stock    
Shareholders' equity:    
Common stock, value 19 17
Total shareholders' equity 19 17
Class B common stock    
Shareholders' equity:    
Common stock, value $ 0 $ 0