Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 233	$ 163	$ 120
Less accumulated depreciation and amortization	(429)	(386)
Property and equipment, net	593	531
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	357	243
Leasehold improvement
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 665	$ 674
Minimum | Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Maximum | Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years