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Stockholders' Equity (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 16, 2016 USD ($) $ / shares shares | Dec. 31, 2017 item shares | Dec. 31, 2016 USD ($)
Equity offerings |  |  |
Shares of common stock sold | 7,043,750 |  |
Price per share of common stock sold (in dollars per share) | $ / shares | $ 12.35 |  |
Proceeds from equity offering | $ | $ 82,900 |  | $ 83,511
2002 Stock Incentive Plan |  |  |
Equity-Based Compensation |  |  |
Maximum number of shares provided for grant under equity-based incentive compensation plan |  | 2,000,000 |
Number of vesting requirements | item |  | 0 |
Number of shares available for grant under the plan |  | 1,944,428 |
Underwriter Overallotment Option |  |  |
Equity offerings |  |  |
Shares of common stock sold | 918,750 |  |

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