Other liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Other liabilities
Lease liability	$ 3,016
Total other current liabilities	3,016
Lease liabilities	31,798
Deferred rent		$ 5,710
Other	1,001	1,001
Total other non-current liabilities	$ 32,799	$ 6,711