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Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based compensation expense        
Stock-based compensation expense $ 717 $ 408 $ 1,342 $ 839
Unrecognized stock-based compensation expense 5,900   $ 5,900  
Unrecognized compensation expense, weighted-average period expected to be recognized     2 years 10 months 24 days  
Research and Development        
Share-based compensation expense        
Stock-based compensation expense 138 73 $ 246 245
General and Administrative        
Share-based compensation expense        
Stock-based compensation expense 466 213 899 439
Sales and Marketing        
Share-based compensation expense        
Stock-based compensation expense $ 113 $ 122 $ 197 $ 155