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Stock-Based Compensation - Restricted Stock Units (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
shares
Weighted Average Exercise Price Per Share  
Unrecognized stock-based compensation expense | $ $ 4.2
Unrecognized compensation expense, weighted-average period expected to be recognized 3 years 1 month 6 days
Restricted stock units  
Number of Restricted Stock Units  
Balance, beginning of period | shares 211,962
Granted | shares 228,013
Vested | shares (88,375)
Cancelled/forfeited | shares (24,697)
Balance, end of period | shares 326,903
Weighted Average Exercise Price Per Share  
Balance, beginning of period (price per share) | $ / shares $ 6.97
Granted (price per share) | $ / shares 3.08
Vested (price per share) | $ / shares 5.90
Cancelled/forfeited (price per share) | $ / shares 7.59
Balance, end of period (price per share) | $ / shares $ 4.50
2016 Employee Incentive Plan | Restricted stock units  
Weighted Average Exercise Price Per Share  
Unrecognized stock-based compensation expense | $ $ 1.1
Unrecognized compensation expense, weighted-average period expected to be recognized 2 years 10 months 24 days