Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details 2)

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Stockholders' Equity (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Total stock-based compensation expense $ 971 $ 397 $ 2,966 $ 397
Employee        
Total stock-based compensation expense 1,018 334 1,723 334
Non-employee        
Total stock-based compensation expense $ (47) $ 63 $ 1,243 $ 63