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Marketable Securities and Fair Value Measurements - Fair Value of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jan. 31, 2016 | Dec. 31, 2015 | Jan. 31, 2015 | Jan. 31, 2014
--- | --- | --- | --- | ---
Marketable securities: |  |  |  |
Marketable securities | $ 7,379 |  | $ 0 | $ 0
Corporate Debt Securities |  |  |  |
Marketable securities: |  |  |  |
Marketable securities | 5,559 |  |  |
Asset-backed Securities |  |  |  |
Marketable securities: |  |  |  |
Marketable securities | 1,820 |  |  |
Fair Value Measurements Recurring |  |  |  |
Restricted cash: |  |  |  |
Total assets measured at fair value | 35,331 | $ 3,367 |  |
Fair Value Measurements Recurring | Level 1 |  |  |  |
Restricted cash: |  |  |  |
Total assets measured at fair value | 984 |  |  |
Fair Value Measurements Recurring | Level 2 |  |  |  |
Restricted cash: |  |  |  |
Total assets measured at fair value | 34,347 | 3,367 |  |
Fair Value Measurements Recurring | Corporate Debt Securities |  |  |  |
Marketable securities: |  |  |  |
Marketable securities | 5,559 |  |  |
Fair Value Measurements Recurring | Corporate Debt Securities | Level 2 |  |  |  |
Marketable securities: |  |  |  |
Marketable securities | 5,559 |  |  |
Fair Value Measurements Recurring | Asset-backed Securities |  |  |  |
Marketable securities: |  |  |  |
Marketable securities | 1,820 |  |  |
Fair Value Measurements Recurring | Asset-backed Securities | Level 2 |  |  |  |
Marketable securities: |  |  |  |
Marketable securities | 1,820 |  |  |
Fair Value Measurements Recurring | Certificates Of Deposit |  |  |  |
Restricted cash: |  |  |  |
Restricted cash | 26,968 | 3,367 |  |
Fair Value Measurements Recurring | Certificates Of Deposit | Level 2 |  |  |  |
Restricted cash: |  |  |  |
Restricted cash | 26,968 | $ 3,367 |  |
Fair Value Measurements Recurring | Money Market Funds |  |  |  |
Restricted cash: |  |  |  |
Restricted cash | 984 |  |  |
Fair Value Measurements Recurring | Money Market Funds | Level 1 |  |  |  |
Restricted cash: |  |  |  |
Restricted cash | $ 984 |  |  |

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