Notes payable (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Notes Payable
April 1, 2020December 31, 2020	$ 1,071
January 1, 2021December 31, 2021	95
Total future minimum payments	1,166
Less: Imputed interest	(10)
Total	1,156
Current portion of notes payable	1,131	$ 1,527
Long-term portion of notes payable	$ 25	$ 95