Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Details)

v3.19.2
Related Party Transactions - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Investor and Holder of August 2016 Series A Warrants        
Related Party Transaction [Line Items]        
Revenue from related party   $ 797 $ 0 $ 0
B . Riley Principal Investments        
Related Party Transaction [Line Items]        
Consulting fees $ 6 $ 50 $ 56 $ 100