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Fair Value Measurements - Recurring (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016 | Nov. 26, 2014
Assets |  |  |
Marketable securities | $ 90,281 | $ 129,846 |
U.S. Treasury securities |  |  |
Assets |  |  |
Marketable securities | 90,281 | 129,846 |
Recurring |  |  |
Assets |  |  |
Cash equivalents | 3,245 | 2,999 |
Marketable securities | 90,281 | 129,846 |
Total Assets | 93,526 | 132,845 |
Recurring | Level 1 |  |  |
Assets |  |  |
Cash equivalents | 3,245 | 2,999 |
Marketable securities | 90,281 | 129,846 |
Total Assets | 93,526 | $ 132,845 |
Series A convertible preferred stock |  |  |
Liabilities |  |  |
Convertible preferred stock liability |  |  | $ 2,600
Series A convertible preferred stock | Obligation to issue second tranche |  |  |
Issuances, changes in fair value, exercise and reclassification of the Level 3 financial instrument |  |  |
Balance as of the beginning of the period | 2,600 |  |
Change in fair value of convertible preferred stock liability through date of Series A second tranche issuance | 17,600 |  |
Recognition of fair value upon issuance of second tranche Series A convertible preferred stock | $ (20,200) |  |

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