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Available-for-sale debt securities (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) security | Sep. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |  |
Realized loss on available-for-sale debt securities | $ 0 | $ 2,473,000 |
Aggregate fair value of securities | $ 79,485,000 | $ 79,485,000 | $ 125,828,000
Number of debt securities | security | 28 | 28 | 54
Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | $ 84,701,000 | $ 84,701,000 |
Gross unrealized losses | (49,000) | (49,000) |
Aggregate estimated fair value | 84,652,000 | 84,652,000 |
Corporate Debt Securities Maturity Period Three Months To One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 82,717,000 | 82,717,000 |
Gross unrealized losses | (49,000) | (49,000) |
Aggregate estimated fair value | 82,668,000 | 82,668,000 |
Commercial Paper Maturity Period Three Months to One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 1,984,000 | 1,984,000 |
Aggregate estimated fair value | $ 1,984,000 | $ 1,984,000 |
Minimum | Corporate Debt Securities Maturity Period Three Months To One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities Debt Maturity Period |  | 3 months |
Minimum | Commercial Paper Maturity Period Three Months to One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities Debt Maturity Period |  | 3 months |
Maximum | Corporate Debt Securities Maturity Period Three Months To One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities Debt Maturity Period |  | 1 year |
Maximum | Commercial Paper Maturity Period Three Months to One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities Debt Maturity Period |  | 1 year |

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