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Stockholders' Equity - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
May 31, 2018 | Mar. 31, 2019 | May 13, 2016
2016 Incentive Plan |  |  |
Class of Stock [Line Items] |  |  |
Number of shares authorized (shares) |  | 10,000,000 | 16,000,000
Number of potential shares authorized for issuance under share based compensation plan (shares) |  |  | 2,000,000
Number of shares available for grant (shares) |  | 1,957,458 |
Number of shares of unvested restricted stock units and options outstanding (shares) |  | 1,713,462 |
Common stock, other shares, outstanding (shares) |  | 5,376,353 |
Award vesting period |  | 3 years |
Maximum contractual term |  | 10 years |
2007 Incentive Plan |  |  |
Class of Stock [Line Items] |  |  |
Common stock, other shares, outstanding (shares) |  | 5,651,247 |
Award vesting period |  | 3 years |
Maximum contractual term |  | 10 years |
Number of shares of unvested restricted stock units (shares) |  | 6,666 |
Common Stock | Sales Agreement |  |  |
Class of Stock [Line Items] |  |  |
Maximum authorized amount | $ 100,000,000.0 |  |
Agent fee | 3.00% |  |
Aggregate number of shares issued (shares) |  | 183,200 |
Common shares sold (dollars per share) |  | $ 5.05 |
Aggregate proceeds |  | $ 907,000 |
Stock sales agreement, remaining authorized sales amount |  | $ 71,100,000 |

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