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Assets - Available-For-Sale Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2017 | Dec. 31, 2016
Total available-for-sale securities |  |  |  |
Amortized Cost |  |  | $ 97,167 | $ 66,807
Gross Unrealized Losses |  |  | (81) | (20)
Estimated Fair Value |  |  | 97,086 | 66,787
Available-for-sale securities in a loss position |  |  |  |
Estimated Fair Value |  |  | 97,086 | 43,788
Gross Unrealized Losses |  |  | (81) | (20)
Investments that had been in a continuous loss position for more than 12 months |  |  | 0 | 0
Realized gains | $ 0 | $ 0 |  |
Amortized costs of contractual maturities of available-for-sale securities |  |  |  |
Due in one year or less |  |  | 72,278 |
Due after one year through two years |  |  | 24,889 |
Amortized Cost |  |  | 97,167 | 66,807
Estimated fair value of contractual maturities of available-for-sale securities |  |  |  |
Due in one year or less |  |  | 72,220 |
Due after one year through two years |  |  | 24,866 |
Estimated Fair Value |  |  | 97,086 | 66,787
U.S. treasuries |  |  |  |
Total available-for-sale securities |  |  |  |
Amortized Cost |  |  | 34,986 | 40,013
Gross Unrealized Losses |  |  | (35) | (5)
Estimated Fair Value |  |  | 34,951 | 40,008
Available-for-sale securities in a loss position |  |  |  |
Estimated Fair Value |  |  | 34,951 | 20,002
Gross Unrealized Losses |  |  | (35) | (5)
Amortized costs of contractual maturities of available-for-sale securities |  |  |  |
Amortized Cost |  |  | 34,986 | 40,013
Estimated fair value of contractual maturities of available-for-sale securities |  |  |  |
Estimated Fair Value |  |  | 34,951 | 40,008
Government agency securities |  |  |  |
Total available-for-sale securities |  |  |  |
Amortized Cost |  |  | 62,181 | 10,020
Gross Unrealized Losses |  |  | (46) | (8)
Estimated Fair Value |  |  | 62,135 | 10,012
Available-for-sale securities in a loss position |  |  |  |
Estimated Fair Value |  |  | 62,135 | 10,012
Gross Unrealized Losses |  |  | (46) | (8)
Amortized costs of contractual maturities of available-for-sale securities |  |  |  |
Amortized Cost |  |  | 62,181 | 10,020
Estimated fair value of contractual maturities of available-for-sale securities |  |  |  |
Estimated Fair Value |  |  | $ 62,135 | 10,012
Corporate debt |  |  |  |
Total available-for-sale securities |  |  |  |
Amortized Cost |  |  |  | 13,780
Gross Unrealized Losses |  |  |  | (7)
Estimated Fair Value |  |  |  | 13,773
Available-for-sale securities in a loss position |  |  |  |
Estimated Fair Value |  |  |  | 13,774
Gross Unrealized Losses |  |  |  | (7)
Amortized costs of contractual maturities of available-for-sale securities |  |  |  |
Amortized Cost |  |  |  | 13,780
Estimated fair value of contractual maturities of available-for-sale securities |  |  |  |
Estimated Fair Value |  |  |  | 13,773
Commercial paper |  |  |  |
Total available-for-sale securities |  |  |  |
Amortized Cost |  |  |  | 2,994
Estimated Fair Value |  |  |  | 2,994
Amortized costs of contractual maturities of available-for-sale securities |  |  |  |
Amortized Cost |  |  |  | 2,994
Estimated fair value of contractual maturities of available-for-sale securities |  |  |  |
Estimated Fair Value |  |  |  | $ 2,994

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