Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,899		$ 1,899		$ 697
Less: accumulated depreciation	(466)		(466)		(374)
Property and equipment, net	1,433		1,433		323
Depreciation	37	$ 17	104	$ 56
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	403		403		293
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	120		120		121
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,348		1,348		255
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 28		$ 28		$ 28