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Stock-Based Compensation - Restricted Stock Units (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Weighted Average Exercise Price Per Share  
Unrecognized stock-based compensation expense | $ $ 4.0
Unrecognized compensation expense, weighted-average period expected to be recognized 3 years
Restricted stock units  
Number of Restricted Stock Units  
Balance, beginning of period | shares 211,962
Granted | shares 405,054
Vested | shares (152,347)
Cancelled/forfeited | shares (24,697)
Balance, end of period | shares 439,972
Weighted Average Exercise Price Per Share  
Balance, beginning of period (price per share) | $ / shares $ 6.97
Granted (price per share) | $ / shares 4.39
Vested (price per share) | $ / shares 6.29
Cancelled/forfeited (price per share) | $ / shares 7.59
Balance, end of period (price per share) | $ / shares $ 4.80
2016 Employee Incentive Plan | Restricted stock units  
Weighted Average Exercise Price Per Share  
Unrecognized stock-based compensation expense | $ $ 1.9
Unrecognized compensation expense, weighted-average period expected to be recognized 2 years 3 months 18 days