Debt - 2019 Exchange Notes (Details)			1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 25, 2020 shares	Sep. 23, 2020 shares	Sep. 30, 2020 USD ($)	May 31, 2019 USD ($) item	Sep. 30, 2019 USD ($)	Jul. 31, 2019 USD ($) shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2016 USD ($)
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Principal amount									$ 12,500,000
Loss on extinguishment of debt					$ (336,000)		$ (4,941,000)
Global amendment agreement
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Increase in principal debt (in percent)			5.00%
Increase in principal debt			$ 2,611,000
Incremental value of cash flows			228,000
Exchange Notes
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Number of Napo convertible notes | item				2
Number of Napo convertible notes exchanged for CVP note | item				2
CVP Exchange Note 1
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Principal amount				$ 10,125,000
Principal amount and accrued interest				10,536,000
Accrued interest on notes payable				$ 411,000
Interest rate (as a percent)				10.00%
Common stock issued in exchange of debt | shares	3,333,333	1,428,571				1,119,440
Convertible debt payable			3,381,000					$ 4,381,000
Repayments of notes payable, principal			1,500,000			$ 6,154,000
Repayments of notes payable, interest						$ 90,000
Share issued for principal and interest payment | shares	3,333,333	1,428,571				1,119,440
2019 Exchange Note 2
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Principal amount				$ 2,297,000
Interest rate (as a percent)				10.00%
Convertible debt payable			$ 2,310,000					$ 2,297,000