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Effects of Adopting ASU Topic 606, Cash Flow Statement Highlights (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Cash Flow Statement Highlights [Abstract]
Net loss	$ (6,450)	$ (3,798)	$ (14,055)	$ (7,691)
Adjustments to reconcile net loss to net cash used in operating activities [Abstract]
Deferred revenue			0	(750)
Net cash used in operating activities			(11,484)	$ (9,390)
Pre-Topic 606 [Member]
Cash Flow Statement Highlights [Abstract]
Net loss	(6,075)		(13,305)
Adjustments to reconcile net loss to net cash used in operating activities [Abstract]
Deferred revenue			(750)
Net cash used in operating activities			(11,484)
Effects of Adopting Topic 606 [Member] | ASU Topic 606 [Member]
Cash Flow Statement Highlights [Abstract]
Net loss	$ (375)		(750)
Adjustments to reconcile net loss to net cash used in operating activities [Abstract]
Deferred revenue			750
Net cash used in operating activities			$ 0

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Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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