Notes payable (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Future Maturities of CRG Obligation

The following table represents future maturities of the CRG obligation as of March 31, 2018:

2018	$	—
2019		—
2020		20,054
2021		20,054
2022		20,054
Total maturities	$	60,162
Unamortized discount and loan costs		(11,877	)
Total CRG obligation	$	48,285