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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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Amount of issuances of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258

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