Shareholders' Equity - Additional Information (Details) - shares
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3 Months Ended |
9 Months Ended |
Sep. 03, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Sep. 30, 2019 |
| Series R Warrant |
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| Shareholders Equity [Line Items] |
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| Number of shares exercise |
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9,416,328
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13,105,263
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| 2018 LTIP |
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| Shareholders Equity [Line Items] |
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| Stock option granted |
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20,000
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1,140,000
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| Stock option canceled |
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67,099
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4
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| Class A Common Stock |
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| Shareholders Equity [Line Items] |
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| Conversion of 2018 Notes, net of costs (in shares) |
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894,836
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34,338,700
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5,109,553
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894,836
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| Proceeds from warrant exercises related to 2018 Note Offering (in shares) |
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210,000
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7,191,668
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200,000
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| Number of shares issued and sold in registered offering |
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15,938,280
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| Class A Common Stock | Series Q warrants |
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| Shareholders Equity [Line Items] |
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| Proceeds from warrant exercises related to 2018 Note Offering (in shares) |
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210,000
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| Class A Common Stock | Series R Warrant |
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| Shareholders Equity [Line Items] |
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| Number of shares issued and sold in registered offering |
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5,008,164
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8,697,009
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| Class A Common Stock | Series S Warrant |
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| Shareholders Equity [Line Items] |
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| Number of shares exercise |
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1,430,141
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| Class A Common Stock | 2018 LTIP | Restricted stock |
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| Shareholders Equity [Line Items] |
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| Number of shares restricted |
201,000
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| Vesting period |
1 year
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