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Note 6 - Note Payable - Summary of Note Payable (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
[1]
2018 (remaining six months) $ 1,359  
2019 2,778  
2020 2,901  
2021 16,672  
2022 19,306  
Thereafter 6,221  
Total payments 49,237  
Less: Amount representing interest (18,125)  
Present value of obligations 31,112  
Less: Unamortized debt discount (1,388)  
Note payable, noncurrent portion $ 29,724 $ 28,948
[1] The condensed consolidated balance sheet as of December 31, 2017 has been derived from the audited consolidated financial statements as of that date.