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Stockholders' Equity - Summary of Restricted Stock Activity (Details) - Restricted Stock
 9 Months Ended
Sep. 30, 2019
$ / shares
shares
Number of Restricted Shares  
Outstanding, beginning balance (in shares) | shares 1,460,210
Granted (in shares) | shares 60,000
Canceled (in shares) | shares 0
Vested (in shares) | shares (121,000)
Expired/Forfeited (in shares) | shares 0
Outstanding, ending balance (in shares) | shares 1,399,210
Weighted Average Grant Date Fair Value  
Outstanding, beginning balance (in dollars per share) | $ / shares $ 4.82
Granted (in dollars per share) | $ / shares 1.70
Canceled (in dollars per share) | $ / shares 0.00
Vested (in dollars per share) | $ / shares 5.24
Expired/Forfeited (in dollars per share) | $ / shares 0.00
Outstanding, ending balance (in dollars per share) | $ / shares $ 4.65