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Stockholders' Equity - Warrants (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Number of Warrants    
Balance of warrants outstanding at the beginning of the period (in shares) 5,505,901  
Exercised (in shares) (1,177,024)  
Balance of warrants outstanding at the end of the period (in shares) 4,328,877 5,505,901
Weighted Average Exercise Price Per Share    
Weighted average exercise price of warrants at the beginning of the period (in USD per share) $ 3.83  
Exercised (in USD per share) 5.32  
Weighted average exercise price of warrants at the end of the period (in USD per share) $ 3.42 $ 3.83
Term    
Weighted-Average Remaining Contractual Term 1 year 5 months 3 days 1 year 7 months 6 days