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Convertible Debt - Narrative (Details) |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 03, 2020 $ / shares shares | Dec. 26, 2019 USD ($) $ / shares shares | Aug. 01, 2019 USD ($) | Mar. 01, 2019 USD ($) day $ / shares | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) shares | Aug. 31, 2020 USD ($) | Dec. 26, 2019 KRW (₩) | Aug. 01, 2019 KRW (₩)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash interest expense |  |  |  |  | $ 466,726 | $ 2,846,641 | $ 979,760 | $ 5,650,396 |  |  |  |
Change in fair value of derivative liability |  |  |  |  | 0 | (97,755,000) | 0 | (110,976,977) |  |  |  |
Convertible senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Original principal amount |  |  |  |  | 78,500,000 |  | 78,500,000 |  |  |  |  |
Unamortized debt issuance cost |  |  |  |  | 270,302 |  | 270,302 |  |  |  |  |
Debt instrument, unamortized discount |  |  |  |  | $ 1,963,908 |  | $ 1,963,908 |  |  |  |  |
August 2019 Bonds | Common stock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument, shares issued (in shares) | shares |  |  |  |  |  |  |  |  | 4,692,364 |  |  |
Convertible Debt | Convertible senior notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Original principal amount |  |  |  | $ 78,500,000 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 6.50% | 6.50% |  | 6.50% |  |  |  |  |
Proceeds from issuance of debt |  |  |  | $ 75,700,000 |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion ratio |  |  |  | 0.1858045 |  |  |  |  |  |  |  |
Debt instrument, convertible conversion price (in dollars per share) | $ / shares |  |  |  | $ 5.38 |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 52,500,000 |  |  |
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 |  |  |  |  |  |  |  |  | $ 62,100,000 |  |  |
Debt conversion, converted instrument, shares issued (in shares) | shares |  |  |  |  |  |  |  |  | 11,535,660 |  |  |
Fair value of date conversion |  |  |  |  |  |  |  |  | $ 43,700,000 |  |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  | 8,800,000 |  |  |
Non-cash interest expense |  |  |  |  | $ 467,000 | 2,100,000 | $ 930,000 | 4,200,000 |  |  |  |
Interest expense, contractual interest |  |  |  |  | $ 267,000 | 1,300,000 | $ 533,000 | 2,600,000 |  |  |  |
Convertible Debt | August 2019 Bonds |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Original principal amount |  |  | $ 15,000,000.0 |  |  |  |  |  |  |  |  | ₩ 18,000,000,000
Stated interest rate |  |  | 1.00% |  |  |  |  |  |  |  |  | 1.00%
Proceeds from issuance of debt |  |  | $ 14,500,000 |  |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion ratio | 0.0002756873 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible conversion price (in dollars per share) | $ / shares | $ 3.14 |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  | 7,100,000 |  |  |  |  |  |  |  |  |
Debt instrument, unamortized discount |  |  | $ 7,300,000 |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument, shares issued (in shares) | shares | 4,962,364 |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  | 8,200,000 |  |  |
Non-cash interest expense |  |  |  |  |  | 672,000 |  | 1,300,000 |  |  |  |
Interest expense, contractual interest |  |  |  |  |  | 37,000 |  | 75,000 |  |  |  |
Fair value of derivative liability |  |  |  |  |  |  |  |  |  | $ 84,500,000 |  |
Change in fair value of derivative liability |  |  |  |  |  |  |  |  | $ 75,700,000 |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Original principal amount |  | $ 4,100,000 |  |  |  |  |  |  |  |  | ₩ 4,700,000,000 |
Stated interest rate |  | 1.00% |  |  |  |  |  |  |  |  | 1.00% |
Proceeds from issuance of debt |  | $ 4,000,000.0 |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  | 6.20% |  | 6.20% |  |  |  |  |
Debt conversion, converted instrument, shares issued (in shares) | shares |  | 1,009,450 |  |  |  |  | 1,009,450 |  |  |  |  |
Non-cash interest expense |  |  |  |  |  | 60,000 | $ 50,000 | 122,000 |  |  |  |
Interest expense, contractual interest |  |  |  |  |  | $ 10,000 | 9,000 | $ 20,000 |  |  |  |
Conversion of carrying value |  |  |  |  |  |  | $ 4,400,000 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |

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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=123431023&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=123431023&loc=d3e4332-108586 + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or 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 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 Reference 2: 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=123431023&loc=d3e4304-108586 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031898-161870 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 + Details
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