Term loan principal repayments (Details)	6 Months Ended
	Jun. 30, 2016 USD ($)
Long-term Debt Term Loan Principal Repayments 1	$ 250
Long-term Debt Term Loan Principal Repayments 2	654
Long-term Debt Term Loan Principal Repayments 3	654
Long-term Debt Term Loan Principal Repayments 4	654
Long-term Debt Term Loan Principal Repayments 5	654
Long-term Debt Term Loan Principal Repayments 6	$ 524