Annual report pursuant to Section 13 and 15(d)

Commitments and contingencies (Details)

v3.7.0.1
Commitments and contingencies (Details)
Dec. 31, 2016
USD ($)
2017 $ 2,329,897
2018 2,033,393
2019 1,574,790
2020 920,280
2021 920,280
Total minimum future commitments $ 7,778,640