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Summary of Significant Accounting Policies - Narrative (Details) |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 26, 2019 USD ($) | Aug. 01, 2019 USD ($) | Mar. 01, 2019 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 KRW (₩) | Dec. 26, 2019 KRW (₩) | Aug. 01, 2019 KRW (₩)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss from operations |  |  |  | $ 24,338,380 | $ (19,171,336) | $ 128,703,059 | $ 32,541,054 | $ 37,662,038 | $ 23,090,693 | $ 29,387,226 | $ 29,219,262 | $ 166,411,157 | $ 119,359,219 | $ 96,967,830 |  |  |
Working capital |  |  |  | 429,500,000 |  |  |  |  |  |  |  | 429,500,000 |  |  |  |  |
Accumulated deficit |  |  |  | 906,196,812 |  |  |  | 739,785,655 |  |  |  | 906,196,812 | 739,785,655 |  |  |  |
Cash, cash equivalents, and short-term investments |  |  |  | 411,600,000 |  |  |  |  |  |  |  | 411,600,000 |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  | $ 454,486,400 | 9,089,010 | $ 29,227,776 |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Allowance for doubtful accounts |  |  |  | 0 |  |  |  | 0 |  |  |  | $ 0 | 0 |  |  |  |
Finite lived intangible assets, net |  |  |  | 3,146,770 |  |  |  | 3,693,851 |  |  |  | 3,146,770 | 3,693,851 |  |  |  |
Deferred tax assets, valuation allowance |  |  |  | 159,705,000 |  |  |  | $ 137,159,000 |  |  |  | $ 159,705,000 | 137,159,000 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant, and equipment, useful life |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant, and equipment, useful life |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  | 18 years |  |  |  |  |
6.50% Convertible Senior Notes Due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | 78,500,000 |  |  |  |  |  |  |  | $ 78,500,000 |  |  |  |  |
December 2019 Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 4,327,370 |  |  |  |  |  |  |  | $ 4,327,370 |  |  |  |  |
Convertible Debt | 6.50% Convertible Senior Notes Due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  | $ 75,700,000 |  |  |  |  |  |  |  |  |  | $ 75,700,000 |  |  |  |
Stated interest rate |  |  | 6.50% | 6.50% |  |  |  | 6.50% |  |  |  | 6.50% | 6.50% |  | 6.50% |  |
Debt instrument, face amount |  |  | $ 78,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | August 2019 Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 14,500,000 |  |  |  |  |  |  |  |  |  |  | $ 14,500,000 |  |  |  |
Stated interest rate |  | 1.00% |  | 1.00% |  |  |  | 100.00% |  |  |  | 1.00% | 100.00% |  | 100.00% |  | 1.00%
Debt instrument, face amount |  | $ 15,000,000.0 |  |  |  |  |  | $ 15,000,000.0 |  |  |  |  | $ 15,000,000.0 |  | ₩ 18,000,000,000 |  | ₩ 18,000,000,000
Convertible Debt | December 2019 Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 4,000,000.0 |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000.0 |  |  |  |
Stated interest rate | 1.00% |  |  |  |  |  |  | 1.00% |  |  |  |  | 1.00% |  | 1.00% | 1.00% |
Debt instrument, face amount | $ 4,100,000 |  |  |  |  |  |  | $ 4,100,000 |  |  |  |  | $ 4,100,000 |  | ₩ 4,700,000,000 | ₩ 4,700,000,000 |
Common stock | Sales Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  |  | $ 454,500,000 | $ 9,100,000 |  |  |  |
Patents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  | 17 years |  |  |  |  |

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