Quarterly report pursuant to Section 13 or 15(d)

Fair value measurements (Schedule of Changes in Level 3 Liabilities Measured at Fair Value) (Details)

v3.19.1
Fair value measurements (Schedule of Changes in Level 3 Liabilities Measured at Fair Value) (Details) - Fair Value, Inputs, Level 3 [Member]
3 Months Ended
Mar. 31, 2019
USD ($)
Convertible Notes [Member]  
Issuance of senior secured convertible notes $ 6,330,726
Issuance of warrants in connection with convertible notes
Balance at January 28, 2019 6,330,726
Change in fair value 1,644,582
Balance at March 31, 2019 7,975,308
Warrant Liability [Member]  
Issuance of senior secured convertible notes
Issuance of warrants in connection with convertible notes 2,568,934
Balance at January 28, 2019 2,568,934
Change in fair value 2,753,228
Balance at March 31, 2019 $ 5,322,162