Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
(Provision for) benefit from income taxes	$ 79	$ (35)	$ 65	$ 75
Effective income tax rate	(1.83%)	1.35%	(0.47%)	(0.86%)
Unrecognized tax benefits	$ 300		$ 300
Unrecognized tax benefits that would favorably impact effective tax rate	$ 300		$ 300