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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2017
Dec. 28, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:                  
Net income (loss)     $ 527,000   $ (13,276,000) $ (45,117,000)   $ (17,971,000) $ (14,704,000)
Adjustments to reconcile net loss to net cash used in operating activities:                  
Stock option compensation (income) expense     (40,000)   46,000 50,000   161,000 349,000
Restricted stock compensation (income) expense     (81,000)   64,000 79,000   266,000 308,000
Depreciation expense $ 100,000 $ 100,000 236,000   127,000 310,000   305,000 617,000
Loss on disposal of equipment     0   20,000 18,000   1,000 15,000
Warrant liability fair value adjustment (2,513,000) 38,000 (17,209,000)   (1,200,000) (15,103,000)   (12,780,000) (564,000)
Gain on warrant extinguishment 0 (9,613,000) 0   (9,613,000) (9,613,000)   0 0
Non-cash interest income     (1,000)   (1,000) (1,000)   (1,000) (1,000)
Debt discount and deferred finance costs amortization           21,544,000   14,268,000 0
Deferred revenue     0   2,000 (32,000)   30,000 0
Loss on debt settlements and extinguishments           29,924,000   0 0
Loss on issuance of financial instrument 2,826,000 0 2,826,000   0        
Debt discount amortization     238,000   15,277,000        
Changes in assets and liabilities:                  
Prepaid expenses and other assets     318,000   201,000 7,000   260,000 9,000
Accounts receivable     (163,000)   (94,000) 108,000   (138,000) (52,000)
Inventories     43,000   (208,000) (543,000)   95,000 (420,000)
Accounts payable and accrued expenses     3,985,000   628,000 3,180,000   1,507,000 (1,757,000)
Deferred revenue     0   2,000 (32,000)   30,000 0
Other non-current liabilities     44,000   (110,000) (209,000)   (216,000) (220,000)
Net cash used in operating activities     (9,277,000)   (8,137,000) (15,398,000)   (14,213,000) (16,420,000)
Cash flows from investing activities:                  
Purchase of property, plant and equipment     (39,000)   (276,000) (524,000)   (258,000) (170,000)
Increase in restricted cash           0   (1,087,000) 0
Proceeds from sales of property, plant and equipment           0   0 180,000
Net cash (used in) provided by investing activities     (39,000)   (276,000) (524,000)   (1,345,000) 10,000
Cash flows from financing activities:                  
Increase in restricted cash           0   (26,200,000) 0
Net proceeds from the release of restricted cash     263,000   5,954,000 13,120,000   0 0
Net proceeds from sale of Series B and Series C preferred shares           2,310,000   0 0
Net proceeds from convertible note debt financing     2,172,000   0 0   31,226,000 0
Net proceeds from sale of stock     4,210,000   15,000 15,000   2,383,000 8,655,000
Net cash provided by financing activities     6,645,000   5,969,000 15,445,000   7,409,000 8,655,000
Foreign currency effects on cash and cash equivalents     (45,000)   (149,000) 67,000   (49,000) (107,000)
Increase (decrease) in cash and cash equivalents     (2,716,000)   (2,593,000) (410,000)   (8,198,000) (7,862,000)
Cash and cash equivalents:                  
Beginning of period     3,999,000 $ 1,816,000 4,409,000 4,409,000 $ 4,409,000 12,607,000 20,469,000
End of period $ 1,283,000 $ 1,816,000 1,283,000 $ 3,999,000 1,816,000 3,999,000   4,409,000 12,607,000
Supplemental non-cash financing activities:                  
Conversion of convertible notes     0   15,831,000 40,121,000 $ 35,000,000 649,000 0
Fair value of warrants issued     23,532,000   0 16,953,000   28,472,000 4,247,000
Cashless exercise of warrants           2,537,000   0 0
Fair value of warrants exercised     0   19,000,000 2,552,000   726,000 123,000
Deemed dividend           527,000   0 0
Fair value of warrants exercised for cash           19,000   726,000 123,000
Series A and Series B Preferred Shares [Member]                  
Cash flows from financing activities:                  
Release of restricted cash for redemption of preferred shares           2,360,000   0 0
Cash paid to redeem preferred shares           (2,360,000)   0 0
Series C Preferred Shares [Member]                  
Cash flows from financing activities:                  
Release of restricted cash for redemption of preferred shares           590,000   0 0
Cash paid to redeem preferred shares           (590,000)   0 0
Series C Warrants [Member]                  
Cash flows from financing activities:                  
Release of restricted cash for extinguishment of Series C Warrants     0   7,876,000 7,876,000   0 0
Cash paid to extinguish of Series C Warrants     $ 0   $ (7,876,000) $ (7,876,000)   $ 0 $ 0