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Stockholders’ Equity - Nonvested Stock (Details)
 3 Months Ended
Mar. 31, 2019
$ / shares
shares
Stock Options  
Beginning balance (in shares) | shares 3,257,801
Granted (in shares) | shares 822,975
Vested (in shares) | shares (458,567)
Cancelled/forfeited (in shares) | shares (192,978)
Ending balance (in shares) | shares 3,429,231
Weighted Average Grant Date  
Beginning balance (in dollars per share) | $ / shares $ 7.32
Granted (in dollars per share) | $ / shares 10.38
Vested (in dollars per share) | $ / shares 6.96
Cancelled/forfeited (in dollars per share) | $ / shares 8.10
Ending balance (in dollars per share) | $ / shares $ 8.06