v3.10.0.1
Warrants - Activity (Details) - $ / shares
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Shares    
Outstanding at beginning of period (in shares) 904,470  
Exercised (in shares) 0  
Expired (in shares) (6,920)  
Outstanding at end of period (in shares) 897,550  
Exercisable at end of period (in shares) 897,550  
Weighted Average Exercise Price    
Outstanding at beginning of period (in dollars per share) $ 5.27  
Expired ( in dollars per share) 6.25  
Outstanding at end of period (in dollars per share) 5.26  
Exercisable at end of period (in dollars per share) $ 5.26  
Range of Exercise Prices    
Temporary equity, shares outstanding (in shares) 15,000 15,000
Minimum    
Range of Exercise Prices    
Outstanding at beginning of period (in dollars per share) $ 2.20  
Outstanding at end of period (in dollars per share) 2.20  
Exercisable (in dollars per share) 2.20  
Maximum    
Range of Exercise Prices    
Outstanding at beginning of period (in dollars per share) 21.00  
Outstanding at end of period (in dollars per share) 21.00  
Exercisable (in dollars per share) $ 21.00