Cash, Cash Equivalents and Investments - Narrative (Details) $ in Millions |
3 Months Ended |
|---|---|
|
Mar. 31, 2018
USD ($)
| |
| Cash and Cash Equivalents [Abstract] | |
| Realized losses from the maturity of available-for-sale securities | $ 0.2 |
| X | ||||||||||
- Definition Debt Securities, Available-For-Sale, Realized Gain (Loss) No definition available.
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| X | ||||||||||
- References No definition available.
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