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Stock-Based Compensation - Restricted Stock Units Award Activity (Details) - Unvested Restricted Stock Units
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding at beginning of year (in shares) | shares 1,548,150
Shares forfeited (shares) | shares (10,196)
Outstanding at end of year (in shares) | shares 1,537,954
Weighted Average Grant Date Price Per Share  
Weighted Average Grant Date Price Per Share, beginning of year (in dollars per share) | $ / shares $ 3.18
Weighted Average Price at Grant, Restricted shares forfeited (in dollars per share) | $ / shares 3.19
Weighted Average Grant Date Price Per Share, end of year (in dollars per share) | $ / shares $ 3.18