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Stockholders' Equity - Common Stock and Warrants (Details) | Dec. 21, 2016 USD ($) $ / shares | Mar. 31, 2017 item shares | Dec. 31, 2016 shares
--- | --- | --- | ---
Convertible Debt |  |  |
Authorized number of shares of common stock | shares |  | 250,000,000 | 250,000,000
Voting right for each share held, number | item |  | 1 |
2016 Convertible Notes | Convertible Notes |  |  |
Convertible Debt |  |  |
Aggregate principle amount | $ 250,000,000 |  |
Debt conversion ratio (in shares) | 0.1633987 |  |
Increment used for debt conversion | $ 1,000 |  |
Conversion price (in dollars per share) | $ / shares | $ 6.12 |  |
2016 Convertible Notes | Convertible Notes | Common Stock |  |  |
Convertible Debt |  |  |
Debt conversion ratio (in shares) | 0.1633987 |  |
Increment used for debt conversion | $ 1,000 |  |
Conversion price (in dollars per share) | $ / shares | $ 6.12 |  |

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