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Stockholders' Equity - Activity of Restricted Stock Issuances (Details) - Restricted Stock and Restricted Stock Units - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Number of Unvested Shares    
Beginning balance (in shares) 829,998 718,167
Granted (in shares) 478,865 405,956
Vested (in shares) (617,498) (294,125)
Forfeitures (in shares) (201,667) 0
Ending balance (in shares) 489,698 829,998
Weighted Average Grant Date Fair Value    
Beginning balance (in dollars per share) $ 1.19 $ 1.22
Granted (in dollars per share) 1.63 1.15
Vested (in dollars per share) 1.23 1.20
Forfeitures (in dollars per share) 1.35 0.00
Ending balance (in dollars per share) $ 1.51 $ 1.19
Aggregate Value of Unvested Shares    
Beginning balance $ 988,763 $ 874,186
Granted 780,252 466,849
Vested (758,653) (352,272)
Forfeitures (272,017) 0
Ending balance $ 738,345 $ 988,763