Stockholders' Equity - Activity for Stock Options and Warrants (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares $ / warrant shares	Dec. 31, 2017 USD ($) $ / shares $ / warrant shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $	$ 3,300
Common stock, shares, outstanding (shares)	9,865,735	9,483,911
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | $	$ 3,300	$ 100
Common Stock Warrants, Shares		209,818
Weighted Average Exercise Price, Warrants Outstanding | $ / warrant	5.90	53.20
Weighted Average Remaining Contractual Term warrant outstanding	4 years 2 months 9 days
Weighted Average Remaining Contractual Term, Warrants Outstanding		11 months 12 days
Aggregate Intrinsic Value, Warrants Outstanding | $	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options and Non-Option Equity Instruments, Outstanding [Roll Forward]
Warrants Granted	0
Weighted Average Exercise Price, Warrants Granted | $ / shares	$ 0.00
Warrants Exercised	0
Weighted Average Exercise Price, Warrants Exercised | $ / shares	$ 0.00
Warrants Expired	0
Weighted Average Exercise Price, Warrants Expired | $ / shares	$ 0.00
Warrants Canceled	(179,818)
Weighted Average Exercise Price, Warrants Canceled | $ / shares	$ 60.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value | $	$ 3,300
shares, vested and expected to vest	30,000
Weighted Average Exercise Price, Warrants vested & expected to vest | $ / warrant	5.90
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	30,000
Weighted Average Exercise Price, Warrants Exercisable | $ / warrant	5.90
weighted Average Remaining Contractual Term, warrants vested	4 years 2 months 9 days
Aggregate Intrinsic Value, Warrants vested and expected to vest | $	$ 0
Aggregate Intrinsic Value, Warrants vested | $	$ 0
US Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares	$ 30.50	$ 33.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 3 months 18 days	4 years 9 months 4 days
Common stock, shares, outstanding (shares)	30,000
Weighted Average Remaining Contractual Term, Warrants Vested and Expect to Vest	4 years 2 months 9 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	1,008,918
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares	$ 30.80
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	5 years 3 months 4 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	157,360
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 4.00
Share-based Compensation Arrangement by Share-based Payment Award, Options and Non-Option Equity Instruments, Outstanding [Roll Forward]
Stock Options, Outstanding at December 31, 2017	1,072,499
Stock Options Exercised	(77,498)
Stock Options Forfeited	(130,801)
Stock Options Expired	(3,030)
Stock Options, Outstanding at December 31, 2018	1,018,530	1,072,499
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ / shares	$ 32.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price | $ / shares	3.80
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price | $ / shares	$ 4.60
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	895,861
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price | $ / shares	$ 34.20
Options, Vested, weighted Average Remaining Contractual Term	4 years 9 months 11 days