Common and Preferred Stock - Activity related to warrants (Details) - $ / shares	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Outstanding and exercisable
Warrants outstanding and exercisable, beginning	249,479	245,680
Warrants outstanding and exercisable, ending	320,427	249,479
Weighted-average exercise price per share, beginning	$ 1.28	$ 1.308
Weighted-average exercise price per share, ending	$ 0.98	$ 1.28
Weighted-average remaining life	3 years 11 months 19 days	3 years 3 months 18 days
Warrants issued
Warrants issued	70,948	34,840
Weighted-average exercise price per share, beginning		$ 3.52
Weighted-average exercise price per share, ending	$ 1.21
Weighted-average remaining life	5 years	5 years
Warrants expired
Warrants expired		(5,000)
Weighted-average exercise price per share, expired		$ 10.00
Warrants exercised
Warrants exercised		(26,044)
Weighted-average exercise price per share, beginning		$ 1.128

Exercise price per share or per unit of warrants or rights outstanding.

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-Name Accounting Standards Codification
-Topic 235
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Number of warrants or rights outstanding.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of non-option equity instruments exercised by participants.

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Number of shares under non-option equity instrument agreements for which rights to exercise lapsed.

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