Income taxes (Tables)

6 Months Ended

Jun. 30, 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 June 30,					Six Months Ended June 30,
	2019		2018			2019		2018
Income tax benefit (provision)	$	205	$	(1,080	)	$	35	$	(1,718	)