Fair Value Measurements (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Financial Assets
Short-term investments	$ 66,810,962	$ 0
Financial Liabilities
Non-current portion of derivative instruments related to stock purchase warrants	0	491,791
Fair Value, Measurements, Recurring [Member]
Financial Assets
Total financial assets measured at fair value	220,652,719	6,430,561
Financial Liabilities
Current portion of derivative instruments related to stock purchase warrants	1,465,272	16,411
Non-current portion of derivative instruments related to stock purchase warrants		491,791
Total financial liabilities measured at fair value	1,465,272	508,202
Fair Value, Measurements, Recurring [Member] \| Short Term Investment [Member]
Financial Assets
Short-term investments	66,810,962
Fair Value, Measurements, Recurring [Member] \| Cash Equivalents [Member]
Financial Assets
Cash equivalents	153,841,757	6,430,561
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial Assets
Total financial assets measured at fair value	11,972,733	6,430,561
Financial Liabilities
Current portion of derivative instruments related to stock purchase warrants	0	0
Non-current portion of derivative instruments related to stock purchase warrants		0
Total financial liabilities measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Short Term Investment [Member]
Financial Assets
Short-term investments	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Cash Equivalents [Member]
Financial Assets
Cash equivalents	11,972,733	6,430,561
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial Assets
Total financial assets measured at fair value	208,679,986	0
Financial Liabilities
Current portion of derivative instruments related to stock purchase warrants	0	0
Non-current portion of derivative instruments related to stock purchase warrants		0
Total financial liabilities measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Short Term Investment [Member]
Financial Assets
Short-term investments	66,810,962
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Cash Equivalents [Member]
Financial Assets
Cash equivalents	141,869,024	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Financial Assets
Total financial assets measured at fair value	0	0
Financial Liabilities
Current portion of derivative instruments related to stock purchase warrants	1,465,272	16,411
Non-current portion of derivative instruments related to stock purchase warrants		491,791
Total financial liabilities measured at fair value	1,465,272	508,202
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Short Term Investment [Member]
Financial Assets
Short-term investments	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Cash Equivalents [Member]
Financial Assets
Cash equivalents	$ 0	$ 0

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