Property and Equipment and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Depreciation	$ 1,600	$ 1,900	$ 1,900
Intangible assets, net	1,064	1,153
License agreements	400	700
Amortization of intangible assets	300	200	100
Impairment of intangible assets			100
Intangible assets not yet placed into service	200
Software License Arrangement
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets	$ 0	$ 0	$ 100
Software License Arrangement | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	3 years
Software License Arrangement | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	5 years