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Accounting Changes and Error Corrections - Warrant Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  |  | $ 1,503 | $ 896 | $ 896
Issuance of warrants to purchase shares of Series F redeemable convertible preferred stock in connection with 2017 Term Loan (Note 4) |  |  |  |  | 289
Change in fair value of financial instruments | $ (200) | $ 55 | 267 | 55 | 318
Ending balance | $ 0 |  | 0 |  | 1,503
As Previously Reported |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  |  | 2,680 | 896 | 896
Issuance of warrants to purchase shares of Series F redeemable convertible preferred stock in connection with 2017 Term Loan (Note 4) |  |  |  |  | 289
Change in fair value of financial instruments |  |  |  |  | 1,495
Ending balance |  |  |  |  | 2,680
Adjustment |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Beginning balance |  |  | $ (1,177) | $ 0 | 0
Issuance of warrants to purchase shares of Series F redeemable convertible preferred stock in connection with 2017 Term Loan (Note 4) |  |  |  |  | 0
Change in fair value of financial instruments |  |  |  |  | (1,177)
Ending balance |  |  |  |  | $ (1,177)

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