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STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Class A Preferred Stock [Member] | Class A Common Shares [Member] | Class B Common Shares [Member] | Common Shares [Member] | Common Stock Issuable [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2016 | $ 24,276 | $ 0 | $ 0 | $ 0 | $ 2 | $ 4,396 | $ 36,998 | $ (17,120)
Balances (in shares) at Dec. 31, 2016 |  | 250,000 | 1,000,000 | 0 | 15,165,244 |  |  |
Common stock issuable - Founders Agreement | 9,558 | $ 0 | $ 0 | $ 0 | $ 0 | 9,558 | 0 | 0
Issuance of common shares - Founders Agreement | 1,234 | 0 | 0 | 0 | $ 0 | (4,396) | 5,630 | 0
Issuance of common shares - Founders Agreement (in shares) |  |  |  |  | 982,533 |  |  |
Issuance of common shares for license expenses | 1,682 | 0 | 0 | 0 | $ 0 | 0 | 1,682 | 0
Issuance of common shares for license expenses (in shares) |  |  |  |  | 293,588 |  |  |
Issuance of common shares and warrants for cash | 55,970 | 0 | 0 | 0 | $ 1 | 0 | 55,969 | 0
Issuance of common shares and warrants for cash (in shares) |  |  |  |  | 8,610,774 |  |  |
Offering cost | (5,674) | 0 | 0 | 0 | $ 0 | 0 | (5,674) | 0
Stock-based compensation expenses | 2,012 | 0 | 0 | 0 | $ 0 | 0 | 2,012 | 0
Stock-based compensation expenses (in shares) |  |  |  |  | 180,000 |  |  |
Capital contribution from Fortress | 2,062 | 0 | 0 | 0 | $ 0 | 0 | 2,062 | 0
Exercise of NSC warrants | 0 | 0 | 0 | 0 | $ 0 | 0 | 0 | 0
Exercise of NSC warrants (in shares) |  |  |  |  | 4,116 |  |  |
Net loss | (31,288) | 0 | 0 | 0 | $ 0 | 0 | 0 | (31,288)
Balances at Dec. 31, 2017 | 59,832 | $ 0 | $ 0 | $ 0 | $ 3 | 9,558 | 98,679 | (48,408)
Balances (in shares) at Dec. 31, 2017 |  | 250,000 | 1,000,000 | 0 | 25,236,255 |  |  |
Common stock issuable - Founders Agreement | 2,085 | $ 0 | $ 0 |  | $ 0 | 2,085 | 0 | 0
Issuance of common shares - Founders Agreement | 0 | 0 | 0 | $ 0 | $ 0 | (9,558) | 9,558 | 0
Issuance of common shares - Founders Agreement (in shares) |  |  |  |  | 834,756 |  |  |
Stock-based compensation expenses | 4,960 | 0 | 0 | 0 | $ 0 | 0 | 4,960 | 0
Stock-based compensation expenses (in shares) |  |  |  |  | 496,552 |  |  |
Exercise of NSC warrants | 181 | 0 | 0 | 0 | $ 0 | 0 | 181 | 0
Exercise of NSC warrants (in shares) |  |  |  |  | 42,620 |  |  |
Net loss | (30,662) | 0 | 0 | 0 | $ 0 | 0 | 0 | (30,662)
Balances at Dec. 31, 2018 | $ 36,396 | $ 0 | $ 0 | $ 0 | $ 3 | $ 2,085 | $ 113,378 | $ (79,070)
Balances (in shares) at Dec. 31, 2018 |  | 250,000 | 1,000,000 | 0 | 26,610,183 |  |  |

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