Cash, Cash Equivalents and Short-Term Investments - Gross Unrealized Gains and Losses (Details) - USD ($) $ in Thousands |
Jun. 30, 2017 |
Dec. 31, 2016 |
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| Cash equivalents and available-for-sale securities | ||
| Amortized Cost | $ 75,219 | $ 65,048 |
| Gross Unrealized Gains | 5 | |
| Gross Unrealized Losses | (19) | (23) |
| Fair Value | 75,200 | 65,030 |
| U.S. treasury bills | ||
| Cash equivalents and available-for-sale securities | ||
| Amortized Cost | 4,300 | |
| Fair Value | 4,300 | |
| Government-sponsored enterprises securities | ||
| Cash equivalents and available-for-sale securities | ||
| Amortized Cost | 9,067 | 16,457 |
| Gross Unrealized Gains | 3 | |
| Gross Unrealized Losses | (5) | (1) |
| Fair Value | 9,062 | 16,459 |
| Corporate bonds and commercial paper | ||
| Cash equivalents and available-for-sale securities | ||
| Amortized Cost | 66,152 | 44,291 |
| Gross Unrealized Gains | 2 | |
| Gross Unrealized Losses | (14) | (22) |
| Fair Value | $ 66,138 | $ 44,271 |
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- References No definition available.
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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