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Stockholders' Equity - Stock Options and Warrants (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
$ / warrant
shares
Dec. 31, 2018
USD ($)
$ / shares
$ / warrant
shares
Warrants, Number of Shares [Roll Forward]    
Warrants, Shares, Beginning of Period 30,000  
Warrants Granted 0  
Warrants Exercised 0  
Warrants Canceled 0  
Warrants Expired 0  
Warrants, Shares, End of Period 30,000 30,000
Warrants Weighted Average Exercise Price [Roll Forward]    
Weighted Average Exercise Price, Warrants Outstanding, Beginning of Period | $ / warrant 5.89  
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 $ 0.00  
Weighted Average Exercise Price, Warrants Outstanding, End of Period | $ / warrant 5.89 5.89
Weighted Average Remaining Contractual Term, Warrant outstanding 3 years 8 months 12 days 4 years 2 months 9 days
Aggregate Intrinsic Value, Warrants Outstanding | $ $ 0 $ 0
Warrants, vested and expected to vest 30,000  
Weighted Average Exercise Price, Warrants vested & expected to vest | $ / warrant 5.89  
Weighted Average Remaining Contractual Term, Warrants Vested and Expect to Vest 3 years 8 months 12 days  
Aggregate Intrinsic Value, Warrants vested and expected to vest | $ $ 0  
Warrants, Vested. Number 30,000  
Warrants, Vested, Weighted Average Exercise Price | $ / warrant 5.89  
Warrants, Vested, Weighted Average Remaining Contractual Term 3 years 8 months 12 days  
Warrants, Vested, Aggregate Intrinsic Value | $ $ 0  
US Equity Plan [Member]    
Options, Outstanding [Roll Forward]    
Options, Outstanding, Beginning of Period 1,018,530  
Options, Grants in Period 209,346  
Options, Exercises in Period (240)  
Options, Forfeitures in Period (2,610)  
Options, Expirations in Period (124,004)  
Options, Outstanding, End of Period 1,101,022 1,018,530
Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Options, Outstanding, Weighted Average Exercise Price, Beginning of Period | $ / shares $ 30.54  
Options, Grants in Period, Weighted Average Exercise Price | $ / shares 4.86  
Options, Exercises in Period, Weighted Average Exercise Price | $ / shares 3.54  
Options, Forfeitures in Period, Weighted Average Exercise Price | $ / shares 4.63  
Options, Expirations in Period, Weighted Average Exercise Price | $ / shares 53.68  
Options, Outstanding, Weighted Average Exercise Price, End of Period | $ / shares $ 23.12 $ 30.54
Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 3 months 5 years 3 months 18 days
Options, Outstanding, Aggregate Intrinsic Value | $ $ 0 $ 3,300
Options, Vested and Expected to Vest, Outstanding, Number 1,076,348  
Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares $ 23.55  
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 6 years 2 months 5 days  
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | $ $ 0  
Options, Vested and Expected to Vest, Exercisable, Number 856,547  
Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price | $ / shares $ 28.40  
Options, Vested, Weighted Average Remaining Contractual Term 5 years 4 months 21 days  
Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value | $ $ 0