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Cash Equivalents and Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized Cost | $ 69,705 | $ 57,436
Gains | 106 | 21
Losses | (44) | 0
Credit Losses | 0 |
Fair Value | 69,767 | 57,457
Cash equivalents |  |
Marketable Securities [Line Items] |  |
Fair Value | 32,090 | 5,381
Short term investments |  |
Marketable Securities [Line Items] |  |
Fair Value | 35,957 | 42,829
Long term investments |  |
Marketable Securities [Line Items] |  |
Fair Value | 1,720 | 9,247
Money market funds |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 32,089 | 5,381
Gains | 0 | 0
Losses | 0 | 0
Credit Losses | 0 |
Fair Value | 32,089 | 5,381
Commercial paper |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 7,061 | 11,892
Gains | 0 | 0
Losses | 0 | 0
Credit Losses | 0 |
Fair Value | 7,061 | 11,892
Corporate notes |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 14,466 | 18,369
Gains | 0 | 11
Losses | (44) | 0
Credit Losses | 0 |
Fair Value | 14,422 | 18,380
U.S. government securities |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 7,786 | 11,291
Gains | 103 | 4
Losses | 0 | 0
Credit Losses | 0 |
Fair Value | 7,889 | 11,295
U.S. asset-backed securities |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 8,303 | 10,503
Gains | 3 | 6
Losses | 0 | 0
Credit Losses | 0 |
Fair Value | $ 8,306 | $ 10,509

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