Income taxes (Tables)

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Summary of Income Tax (Provisions) Benefits

The provision for income taxes in the periods presented is based upon the income (loss) before income taxes (in thousands):   

	Three Months Ended March 31,
	2019			2018
Provision for income taxes	$	(170	)	$	(638	)