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Stock-based Compensation - Restricted Stock and Performance Stock Units Activity (Details) - Restricted Stock and Performance Stock Units
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Number of Awards  
Outstanding at beginning of period (shares) | shares 2,933,236
Granted (shares) | shares 1,253,200
Forfeited (shares) | shares (294,600)
Vested and converted to shares, net of units withheld for taxes (shares) | shares (666,063)
Units withheld for taxes (shares) | shares (266,748)
Outstanding at end of period (shares) | shares 2,959,025
Expected to vest (shares) | shares 2,603,942
Weighted average grant date fair value per share  
Outstanding beginning of period (USD per share) | $ / shares $ 2.50
Granted (USD per share) | $ / shares 1.94
Forfeited (USD per share) | $ / shares 2.41
Vested and converted to shares, net of units withheld for taxes (USD per share) | $ / shares 2.45
Units withheld for taxes (USD per share) | $ / shares 2.45
Outstanding end of period (USD per share) | $ / shares 2.28
Expected to vest (USD per share) | $ / shares $ 2.28