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Stockholder's Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 21, 2017 | Mar. 31, 2019 | Dec. 31, 2018 | Nov. 21, 2018 | Feb. 12, 2018
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares authorized (in shares) |  | 10,000,000 | 10,000,000 |  | 10,000,000
Preferred stock, par value (in dollars per share) |  | $ 0.00001 | $ 0.00001 |  | $ 0.00001
Preferred stock, shares issued (in shares) |  | 0 | 0 |  |
Preferred stock, shares outstanding (in shares) |  | 0 | 0 |  |
Common stock, shares authorized (in shares) |  | 100,000,000 | 100,000,000 |  | 100,000,000
Common stock, par value (in dollars per share) |  | $ 0.00001 | $ 0.00001 |  | $ 0.00001
Common stock, shares, issued (in shares) |  | 27,285,363 | 27,274,991 |  |
Common stock, shares, outstanding (in shares) |  | 27,285,363 | 27,274,991 |  |
Maximum number of shares authorized under the plan (in shares) | 4,361,291 |  |  |  |
Annual increase percentage of maximum shares outstanding (equal to) | 4.00% |  |  |  |
Additional capital shares reserved for future issuance (in shares) |  |  |  | 1,091,000 |
Capital shares reserved for future issuance (in shares) |  | 1,283,193 |  |  |
Contractual term |  | 10 years |  |  |
Capitalized compensation expense |  | $ 17,000 |  |  |
Minimum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Award vesting period |  | 2 years |  |  |
Maximum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Award vesting period |  | 4 years |  |  |

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