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Accounting Changes and Error Corrections - Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in fair value of financial instruments	$ (200)			$ 55			$ 267	$ 55	$ 318
Net loss	(3,141)	$ (2,785)	$ (2,704)	(1,756)	$ (2,146)	$ (2,793)	(8,630)	(6,695)
Net Income (Loss) Available to Common Stockholders, Basic	(17,080)			(4,524)			(26,871)	(14,309)
Net loss attributable to common stockholders (diluted)	$ (17,080)			$ (4,524)			$ (26,871)	$ (14,309)
Net loss per share, basic and diluted (USD per share)	$ (11.29)			$ (71.80)			$ (48.70)	$ (227.11)
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in fair value of financial instruments									1,495
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in fair value of financial instruments									$ (1,177)

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