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Note 6 - Note Payable - Summary of Note Payable (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
[1]
2019 (remaining six months) $ 1,414  
2020 2,901  
2021 16,673  
2022 19,306  
2023 6,220  
Total payments 46,514  
Less: Amount representing interest (14,121)  
Present value of obligations 32,393  
Less: Unamortized debt discount (1,122)  
Note payable, noncurrent portion $ 31,271 $ 30,528
[1] The condensed consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date.