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Shareholders' Equity - Stock options and warrants (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) $ / shares $ / warrant shares | Dec. 31, 2017 USD ($) $ / shares $ / warrant shares
Warrants, Number of Shares [Roll Forward] |  |
Warrants, Shares, Beginning of Period | 209,818 |
Warrants Granted | 0 |
Warrants Exercised | 0 |
Warrants Canceled | 0 |
Warrants Expired | (158,664) |
Warrants, Shares, End of Period | 51,154 | 209,818
Warrants Weighted Average Exercise Price [Roll Forward] |  |
Weighted Average Exercise Price, Warrants Outstanding, Beginning of Period | $ / warrant | 53.20 |
Weighted Average Exercise Price, Warrants Granted | $ / shares | $ 0.00 |
Weighted Average Exercise Price, Warrants Exercised | $ / shares | 0.00 |
Weighted Average Exercise Price, Warrants Canceled | $ / shares | 0.00 |
Weighted Average Exercise Price, Warrants Expired | $ / shares | $ 50.20 |
Weighted Average Exercise Price, Warrants Outstanding, End of Period | $ / warrant | 62.70 | 53.20
Weighted Average Remaining Contractual Term, Warrant outstanding | 3 years 1 month 6 days | 11 months 12 days
Aggregate Intrinsic Value, Warrants Outstanding | $ | $ 0 | $ 0
Warrants, vested and expected to vest | 51,154 |
Weighted Average Exercise Price, Warrants vested & expected to vest | $ / warrant | 62.70 |
Weighted Average Remaining Contractual Term, Warrants Vested and Expect to Vest | 3 years 1 month 6 days |
Aggregate Intrinsic Value, Warrants vested and expected to vest | $ | $ 0 |
Warrants, Vested. Number | 51,154 |
Warrants, Vested, Weighted Average Exercise Price | $ / warrant | 62.70 |
Warrants, Vested, Weighted Average Remaining Contractual Term | 3 years 1 month 6 days |
Warrants, Vested, Aggregate Intrinsic Value | $ | $ 0 |
US Equity Plan [Member] |  |
Options, Outstanding [Roll Forward] |  |
Options, Outstanding, Beginning of Period | 1,072,499 |
Options, Grants in Period, Net of Forfeitures | 140,410 |
Options, Exercises in Period | (11,673) |
Options, Forfeitures in Period | (1,080) |
Options, Expirations in Period | (57,197) |
Options, Outstanding, End of Period | 1,142,959 | 1,072,499
Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |
Options, Outstanding, Weighted Average Exercise Price, Beginning of Period | $ / shares | $ 33.50 |
Options, Grants in Period, Weighted Average Exercise Price | $ / shares | 3.80 |
Options, Exercises in Period, Weighted Average Exercise Price | $ / shares | 4.60 |
Options, Forfeitures in Period, Weighted Average Exercise Price | $ / shares | 3.80 |
Options, Expirations in Period, Weighted Average Exercise Price | $ / shares | 22.60 |
Options, Outstanding, Weighted Average Exercise Price, End of Period | $ / shares | $ 29.90 | $ 33.50
Options, Outstanding, Weighted Average Remaining Contractual Term | 5 years 4 months 13 days | 4 years 9 months 4 days
Options, Outstanding, Intrinsic Value | $ | $ 975,200 | $ 100
Options, Vested and Expected to Vest, Outstanding, Number | 1,129,369 |
Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares | $ 30.30 |
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term | 5 years 3 months 26 days |
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | $ | $ 947,800 |
Options, Vested and Expected to Vest, Exercisable, Number | 1,034,190 |
Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price | $ / shares | $ 32.70 |
Options, Vested, Weighted Average Remaining Contractual Term | 4 years 10 months 28 days |
Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value | $ | $ 759,000 |

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