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Commitments and Contingencies - Textual (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2019 USD ($) | Mar. 18, 2018 | Apr. 14, 2017 USD ($) | Oct. 22, 2013 USD ($) | Mar. 31, 2018 shares | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) ft² shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 shares | Mar. 21, 2018 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) | shares |  |  |  |  |  |  |  | 1,120,500 |  | 660,557 |
Settlement of litigation, net |  |  |  |  |  |  |  | $ 0 | $ 4,358,223 |  |
Greenberg Traurig |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount awarded from other party |  |  | $ 4,500,000 |  |  |  |  |  |  |  |
Litigation settlement interest |  |  |  | $ 6,000,000 |  |  |  |  |  |  |
Payments for legal settlements |  |  |  |  |  | $ 141,777 |  |  |  |  |
Settlement of litigation, net |  |  |  |  |  |  | $ 4,358,223 |  |  |  |
Greenberg Traurig, Scenario One |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate, net settlement proceeds, percentage |  |  |  | 5.00% |  |  |  |  |  |  |
Interest rate, net settlement proceeds, amount |  |  |  | $ 25,000,000 |  |  |  |  |  |  |
Greenberg Traurig, Scenario Two |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate, net settlement proceeds, percentage |  |  |  | 8.00% |  |  |  |  |  |  |
Interest rate, net settlement proceeds, amount |  |  |  | $ 25,000,000 |  |  |  |  |  |  |
Chief Accounting Officer |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Base salary |  |  |  |  |  |  |  |  |  |  | $ 210,000
Severance benefits, period |  |  |  |  | 6 months |  |  |  |  |  |
Severance benefits to be awarded upon termination after one year of employment, period |  |  |  |  | 12 months |  |  |  |  |  |
Chief Accounting Officer | Stock Option |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual performance bonus (in shares) | shares |  |  |  |  | 100,000 |  |  |  |  |  |
Conditional award (in shares) | shares |  |  |  |  | 50,000 |  |  |  |  |  |
Chief Accounting Officer | Stock Option, Sign-On Award |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) | shares |  |  |  |  | 50,000 |  |  |  |  |  |
Sign on, vesting period |  | 4 years |  |  | 4 years |  |  |  |  |  |
Jupiter, Florida Headquarters Lease |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Area of building rented | ft² |  |  |  |  |  |  |  | 4,900 |  |  |
Monthly rental rate |  |  |  |  |  |  |  | $ 9,450 |  |  |
Netherlands Office Lease |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Area of building rented | ft² |  |  |  |  |  |  |  | 258 |  |  |
Rent expense |  |  |  |  |  |  |  | $ 4,700 |  |  |
Netherlands Office Lease | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rent expense | $ 4,000 |  |  |  |  |  |  |  |  |  |
Term of contract | 1 year |  |  |  |  |  |  |  |  |  |

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