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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 32,124,187 $ 43,903,949
Prepaid expenses and deposits 2,632,514 1,526,442
Interest receivable 3,440 56,189
Total current assets 34,760,141 45,486,580
Non-current assets:    
Property, plant and equipment, net 1,592,094 417,528
Construction in progress 2,629,141 0
Right-of-use assets, net 9,542,228 455,174
Total non-current assets 13,763,463 872,702
Total assets 48,523,604 46,359,282
Current liabilities:    
Accounts payable and accrued liabilities 4,528,021 1,757,680
Lease liability 456,065 204,132
Warrant liability   31,000
Total current liabilities 4,984,086 1,992,812
Non-current liabilities:    
Lease liability, net of current portion 9,025,273 280,247
Total non-current liabilities 9,025,273 280,247
Total liabilities 14,009,359 2,273,059
Commitments and contingencies (see Note 10)
Stockholders' equity:    
Preferred stock - $0.001 par value, 5 million shares authorized and 0 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively
Common stock, $0.001 par value, 150 million shares authorized, 46.6 million and 45.7 million shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively 46,617 45,728
Additional paid-in capital 374,828,385 371,573,909
Accumulated deficit (340,360,757) (327,533,414)
Total stockholders' equity 34,514,245 44,086,223
Total liabilities and stockholders' equity $ 48,523,604 $ 46,359,282