Share-Based compensation - Summary of Status of Company's Stock Option Plan (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Shares
Outstanding at beginning of period	4,415,397	3,069,440
-Exercised	(10,000)	(5,000)
-Granted	3,164,800	3,874,200
-Cancelled	(527,820)	(2,523,243)
Outstanding at end of period	7,042,377	4,415,397
Weighted Average Exercise Price
Outstanding at beginning of period	$ 1.20	$ 4.28
-Exercised	0.89	3.43
-Granted	0.79	1.19
-Cancelled	1.23	4.92
Outstanding at end of period	$ 1.01	$ 1.20
Stock Option Plan
Shares
-Granted	3,164,800	3,874,200