Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Aggregate Future Principal, Final Payment Fees and Discounts of Long-Term Debt (Details)

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Long-Term Debt - Aggregate Future Principal, Final Payment Fees and Discounts of Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
[1]
Debt Disclosure [Abstract]    
Three months ending December 31, 2019 $ 1,146  
Year ending December 31, 2020 6,086  
Year ending December 31, 2021 8,576  
Year ending December 31, 2022 21,950  
Total payments 37,758  
Less: interest, final payment fees, discount and issuance cost (5,079)  
Total payments, net of interest, final payment fees, discount and issuance cost 32,679  
Less: current portion of long-term debt (3,981) $ (789)
Long-term debt $ 28,698 $ 21,690
[1] The consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.