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Other Financial Statement Information (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Information:    
Cash paid for interest $ 640 $ 363
Cash paid for taxes 5 11
Non-Cash Investing and Financing Activities    
Noncash preferred stock dividends 246 463
Issuance of notes in exchange for accounts payable 288
Issuance of stock upon conversion of preferred stock 2,246 307
Issuance of warrants with term loan extensions 2,218 361
Issuance of stock in exchange for accounts payable $ 86