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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:          
Net income (loss) $ 7,187,000 $ (11,332,000) $ (45,117,000) $ (17,971,000) $ (14,704,000)
Adjustments to reconcile net loss to net cash used in operating activities:          
Stock option compensation expense 7,000 21,000 50,000 161,000 349,000
Restricted stock compensation expense 14,000 27,000 79,000 266,000 308,000
Depreciation expense 120,000 74,000 310,000 305,000 617,000
Loss on disposal of equipment 0 20,000 18,000 1,000 15,000
Warrant liability fair value adjustment (14,697,000) (1,238,000) (15,103,000) (12,780,000) (564,000)
Gain on warrant extinguishment     (9,613,000) 0 0
Non-cash interest income (4,000) (2,000) (1,000) (1,000) (1,000)
Debt discount and deferred finance costs amortization 0 8,363,000 21,544,000 14,268,000 0
Loss on debt settlements and extinguishments     29,924,000 0 0
Changes in assets and liabilities:          
Prepaid expenses and other assets 152,000 117,000 7,000 260,000 9,000
Accounts receivable (24,000) (94,000) 108,000 (138,000) (52,000)
Inventories 24,000 (115,000) (543,000) 95,000 (420,000)
Accounts payable and accrued expenses 828,000 401,000 3,180,000 1,507,000 (1,757,000)
Deferred revenue     (32,000) 30,000 0
Other non-current liabilities (50,000) (59,000) (209,000) (216,000) (220,000)
Net cash used in operating activities (6,443,000) (3,817,000) (15,398,000) (14,213,000) (16,420,000)
Cash flows from investing activities:          
Purchase of property, plant and equipment (6,000) (58,000) (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 (6,000) (58,000) (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 238,000 6,091,000 13,120,000 0 0
Net proceeds from sale of stock and exercise of warrants 4,253,000 0 15,000 2,383,000 8,655,000
Net cash provided by financing activities 4,491,000 6,091,000 15,445,000 7,409,000 8,655,000
Net proceeds from sale of Series B and Series C preferred shares     2,310,000 0 0
Net proceeds from convertible note debt financing     0 31,226,000 0
Foreign currency effects on cash and cash equivalents (12,000) (221,000) 67,000 (49,000) (107,000)
Increase (decrease) in cash and cash equivalents (1,970,000) 1,995,000 (410,000) (8,198,000) (7,862,000)
Cash and cash equivalents:          
Beginning of period 3,999,000 4,409,000 4,409,000 12,607,000 20,469,000
End of period 2,029,000 6,404,000 3,999,000 4,409,000 12,607,000
Supplemental non-cash activities:          
Conversion of convertible notes 0 12,210,000 40,121,000 649,000 0
Fair value of warrants issued 18,306,000 0 16,953,000 28,472,000 4,247,000
Fair value of warrants exercised $ 0 $ 0 2,552,000 726,000 123,000
Cashless exercise of warrants     2,537,000 0 0
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     7,876,000 0 0
Cash paid to extinguish of Series C Warrants     $ (7,876,000) $ 0 $ 0