Summary of significant accounting policies (Tables)

6 Months Ended

Jun. 30, 2016

Accounting Policies [Abstract]

Summary of Company's Assets and Liabilities Measured at Fair Value on Recurring Basis

The table below presents information about the Company’s assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2016 and December 31, 2015:

			Quoted		Significant
	Total fair		prices		other		Significant
	value at		in active		observable		unobservable
	June 30,		markets		inputs		inputs
	2016		(Level 1)		(Level 2)		(Level 3)
Interest rate caps	$	134	$	—	$	134	$	—
			Quoted		Significant
	Total fair		prices		other		Significant
	value at		in active		observable		unobservable
	December 31,		markets		inputs		inputs
	2015		(Level 1)		(Level 2)		(Level 3)
Interest rate caps	$	1,147	$	—	$	1,147	$	—