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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current assets:      
Cash and cash equivalents $ 3,872 $ 5,261 $ 9,550
Accounts receivable 253 178 130
Restricted cash 40 40 675
Inventories, net 107 107 107
Other current assets 736 785 780
Current assets held for sale 3,454 3,277 3,622
Total current assets 8,462 9,648 14,864
Property and equipment, net 2,384 2,299 2,325
Operating lease right-of-use assets 1,123    
Other assets 40 39 42
Noncurrent assets held for sale 12,235 11,633 14,012
Goodwill 372 372 372
Total assets 24,616 23,991 31,615
Current liabilities:      
Accounts payable and accrued expenses 2,729 2,777 4,206
Operating lease liability 345    
Term obligations, net of discount 14,371 14,202 13,624
Current liabilities held for sale 850 580 584
Total current liabilities 18,295 17,559 18,414
Other noncurrent liabilities 28 46  
Noncurrent operating lease liability 778    
Warrant liability 706 916  
Noncurrent liabilities held for sale 952 245 201
Total liabilities 20,759 18,766 18,615
Commitments and contingencies
Stockholders’ equity:      
Preferred stock
Common stock 0 0 0
Additional paid-in capital 420,312 418,390 413,362
Accumulated other comprehensive income 1,078 1,218 1,387
Accumulated deficit (417,533) (414,383) (401,749)
Total stockholders’ equity 3,857 5,225 13,000
Total liabilities and stockholders’ equity $ 24,616 $ 23,991 $ 31,615