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Available-for-sale Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Investments Debt And Equity Securities [Abstract] |
Summary of Available-for-Sale Securities | The following is a summary of available-for-sale securities at December 31, 2016 (in thousands):
|  | December 31, 2016 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Money market funds |  | $ | 8,991 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,991 |
United States government agency securities |  |  | 8,030 |  |  |  | — |  |  |  | (1 | ) |  |  | 8,029 |
Corporate debt securities |  |  | 37,110 |  |  |  | — |  |  |  | (23 | ) |  |  | 37,087 |
Marketable equity securities |  |  | — |  |  |  | 3,952 |  |  |  | — |  |  |  | 3,952 |
Total available-for-sale securities |  | $ | 54,131 |  |  | $ | 3,952 |  |  | $ | (24 | ) |  | $ | 58,059 |
The following is a summary of available-for-sale securities at December 31, 2015(in thousands):
|  | December 31, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Money market funds |  | $ | 59,302 |  |  | $ | — |  |  | $ | — |  |  | $ | 59,302 |
Corporate debt securities |  |  | 25,747 |  |  |  | — |  |  |  | (49 | ) |  |  | 25,698 |
Marketable equity securities |  |  | — |  |  |  | 11,163 |  |  |  | — |  |  |  | 11,163 |
Total available-for-sale securities |  | $ | 85,049 |  |  | $ | 11,163 |  |  | $ | (49 | ) |  | $ | 96,163 |
Available-for-Sale Debt Securities by Original Contractual Maturity | Available-for-sale securities at December 31, 2016 and 2015, consisted of the following by contractual maturity (in thousands):
|  | December 31, 2016 |  |  | December 31, 2015 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
One year or less |  | $ | 54,131 |  |  | $ | 54,107 |  |  | $ | 85,049 |  |  | $ | 85,000 |
Marketable equity securities |  |  | — |  |  |  | 3,952 |  |  |  | — |  |  |  | 11,163 |
Greater than one year and less than five years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total available-for-sale securities |  | $ | 54,131 |  |  | $ | 58,059 |  |  | $ | 85,049 |  |  | $ | 96,163 |
Available-for-Sale Marketable Securities in Unrealized Position | The following tables show all available-for-sale marketable securities in an unrealized loss position for which an other-than-temporary impairment has not been recognized and the related gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):
|  | December 31, 2016 |
|  | Less than 12 Months |  |  | 12 Months or Greater |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
Money market funds |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
United States government agency securities |  |  | 6,035 |  |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | 6,035 |  |  |  | (1 | )
Corporate debt securities |  |  | 34,086 |  |  |  | (23 | ) |  |  | — |  |  |  | — |  |  |  | 34,086 |  |  |  | (23 | )
Total available-for-sale securities |  | $ | 40,121 |  |  | $ | (24 | ) |  | $ | — |  |  | $ | — |  |  | $ | 40,121 |  |  | $ | (24 | )
|  | December 31, 2015 |
|  | Less than 12 Months |  |  | 12 Months or Greater |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
Money market funds |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
United States government agency securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Corporate debt securities |  |  | 20,170 |  |  |  | (46 | ) |  |  | 5,528 |  |  |  | (3 | ) |  |  | 25,698 |  |  |  | (49 | )
Total available-for-sale securities |  | $ | 20,170 |  |  | $ | (46 | ) |  | $ | 5,528 |  |  | $ | (3 | ) |  | $ | 25,698 |  |  | $ | (49 | )

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