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Stockholders' Equity - ESPP (Details) - ESPP - $ / shares | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jan. 01, 2018 | Apr. 03, 2014
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Common stock reserved for future issuance (in shares) |  |  | 880,000
Automatic annual increase in common stock reserved for issuance, percentage |  |  | 1.00%
Maximum annual increase of shares reserved |  |  | 1,000,000
Automatic annual increase in common stock reserved for issuance, shares |  | 566,316 |
Purchases made under the ESPP | 136,321 |  |
Weighted-average price per share | $ 21.16 |  |

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