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Convertible Debt - Narrative (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
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Aug. 03, 2020 $ / shares shares | Dec. 26, 2019 USD ($) $ / shares | Aug. 01, 2019 USD ($) | Mar. 01, 2019 USD ($) day $ / shares | Jul. 31, 2020 USD ($) shares | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Aug. 31, 2020 USD ($) | Dec. 31, 2019 KRW (₩) | Dec. 26, 2019 KRW (₩) | Aug. 01, 2019 KRW (₩)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash interest expense |  |  |  |  |  | $ 1,984,046 | $ 2,428,671 | $ 7,634,442 | $ 5,279,702 |  |  |  |  |
Change in fair value of derivative liability |  |  |  |  |  | 35,306,000 | 2,551,453 | $ (75,670,977) | 2,551,453 |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument, shares issued (in shares) | shares |  |  |  |  |  |  |  | 4,692,364 |  |  |  |  |  |
6.50% Convertible Senior Notes Due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | 78,500,000 |  | $ 78,500,000 |  |  |  |  |  |
Unamortized debt issuance cost |  |  |  |  |  | 1,233,978 |  | 1,233,978 |  |  |  |  |  |
Debt instrument, unamortized discount |  |  |  |  |  | 8,965,643 |  | 8,965,643 |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  | 3,087,595 | 0 | 3,087,595 | 0 |  |  |  |  |
August 2019 Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  | (8,177,043) | 0 |  |  |  |  |
December 2019 Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | 4,030,978 |  | 4,030,978 |  |  |  |  |  |
Unamortized debt issuance cost |  |  |  |  |  | $ 37,985 |  | $ 37,985 |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible conversion price (in dollars per share) | $ / shares |  |  |  | $ 5.38 |  |  |  |  |  |  |  |  |  |
Convertible Debt | 6.50% Convertible Senior Notes Due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 78,500,000 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  | $ 75,700,000 |  |  |  |  |  | $ 75,700,000 |  |  |  |
Stated interest rate |  |  |  | 6.50% |  | 6.50% |  | 6.50% |  | 6.50% |  | 6.50% |  |
Debt instrument, convertible, conversion ratio |  |  |  | 0.1858045 |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, threshold trading days | day |  |  |  | 20 |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, threshold consecutive trading days | day |  |  |  | 30 |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  | $ 62,200,000 | $ 16,100,000 |  |  |  |  |  |  |  |  |
Unamortized debt issuance cost |  |  |  | 2,800,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, unamortized discount |  |  |  | $ 18,600,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  | 13.10% |  | 13.10% |  |  |  |  |  |
Debt conversion, converted instrument principal amount |  |  |  |  | $ 19,100,000 |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument, shares issued (in shares) | shares |  |  |  |  | 3,546,074 |  |  |  |  |  |  |  |  |
Fair value of date conversion |  |  |  |  | $ 13,000,000.0 |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  | $ 3,100,000 |  |  |  |  |  |  |  |  |
Non-cash interest expense |  |  |  |  |  | $ 1,700,000 | 2,100,000 | $ 5,900,000 | 4,900,000 |  |  |  |  |
Interest expense, contractual interest |  |  |  |  |  | $ 996,000 | $ 1,300,000 | $ 3,500,000 | 3,100,000 |  |  |  |  |
Convertible Debt | August 2019 Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 15,000,000.0 |  |  |  |  |  |  | $ 15,000,000.0 |  | ₩ 18,000,000,000 |  | ₩ 18,000,000,000
Proceeds from issuance of debt |  |  | $ 14,500,000 |  |  |  |  |  |  | $ 14,500,000 |  |  |  |
Stated interest rate |  |  | 1.00% |  |  | 1.00% |  | 1.00% |  | 1.00% |  | 1.00% |  | 1.00%
Debt instrument, convertible, conversion ratio | 0.0002756873 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible conversion price (in dollars per share) | $ / shares | $ 3.04 |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  | $ 7,100,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, unamortized discount |  |  | $ 7,300,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  | 29.40% |  | 29.40% |  |  |  |  |  |
Debt conversion, converted instrument, shares issued (in shares) | shares | 4,962,364 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  | $ 8,200,000 |  |  |  |  |  |  |  |
Non-cash interest expense |  |  |  |  |  | 238,000 |  | $ 1,600,000 | 374,000 |  |  |  |  |
Interest expense, contractual interest |  |  |  |  |  | 13,000 |  | 87,000 | $ 26,000 |  |  |  |  |
Fair value of derivative liability |  |  |  |  |  |  |  |  |  |  | $ 84,500,000 |  |  |
Change in fair value of derivative liability |  |  |  |  |  | $ 35,300,000 |  | $ 75,700,000 |  |  |  |  |  |
Debt instrument, convertible, internal rate of return |  |  |  |  |  | 6.00% |  | 6.00% |  |  |  |  |  |
Convertible Debt | August 2019 Bonds | Initial Conversion Price |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion ratio | 0.0002110595 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible conversion price (in dollars per share) | $ / shares | $ 4.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | December 2019 Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 4,100,000 |  |  |  |  |  |  |  | $ 4,100,000 |  | ₩ 4,700,000,000 | ₩ 4,700,000,000 |
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% | 1.00% |
Debt instrument, effective interest rate |  |  |  |  |  | 6.20% |  | 6.20% |  |  |  |  |  |
Non-cash interest expense |  |  |  |  |  | $ 63,000 |  | $ 185,000 |  |  |  |  |  |
Interest expense, contractual interest |  |  |  |  |  | $ 10,000 |  | $ 30,000 |  |  |  |  |  |
Debt instrument, convertible, internal rate of return |  | 6.00% |  |  |  | 6.00% |  | 6.00% |  |  |  |  | 6.00% |
Debt instrument, convertible, required bondholder approval, percentage |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | December 2019 Bonds | Initial Conversion Price |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion ratio |  | 0.0002147766 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible conversion price (in dollars per share) | $ / shares |  | $ 4.00 |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | December 2019 Bonds | After July 2, 2020 Conversion Price | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion ratio |  | 0.0003579611 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible conversion price (in dollars per share) | $ / shares |  | $ 2.40 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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