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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | $ 116,826 | $ 121,151
Money market funds |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 15,460 | 10,681
US Treasury and Government Short-term Debt Securities [Member] |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 63,612 | 48,292
Corporate notes, bonds and commercial paper |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 37,754 | 62,178
Recurring basis |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 116,826 | 121,151
Recurring basis | Money market funds |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 15,460 | 10,681
Recurring basis | US Treasury and Government Short-term Debt Securities [Member] |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 63,612 | 48,292
Recurring basis | Corporate notes, bonds and commercial paper |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 37,754 | 62,178
Recurring basis | Quoted Market Prices in Active Markets (Level 1) |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 16,206 | 10,984
Recurring basis | Quoted Market Prices in Active Markets (Level 1) | Money market funds |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 15,460 | 10,681
Recurring basis | Quoted Market Prices in Active Markets (Level 1) | US Treasury and Government Short-term Debt Securities [Member] |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 0 | 0
Recurring basis | Quoted Market Prices in Active Markets (Level 1) | Corporate notes, bonds and commercial paper |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 746 | 303
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 100,620 | 110,167
Recurring basis | Significant Other Observable Inputs (Level 2) | Money market funds |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 0 | 0
Recurring basis | Significant Other Observable Inputs (Level 2) | US Treasury and Government Short-term Debt Securities [Member] |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 63,612 | 48,292
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate notes, bonds and commercial paper |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 37,008 | 61,875
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Money market funds |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | US Treasury and Government Short-term Debt Securities [Member] |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | 0 | 0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate notes, bonds and commercial paper |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Total available-for-sale securities | $ 0 | $ 0

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