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Cash and Cash Equivalents and Investments (Details 1) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Cash and Cash Equivalents |  |
Fair Value |  |
Amortized Cost | $ 55,592 | $ 36,112
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 55,592 | 36,112
U.S. Treasury Securities |  |
Fair Value |  |
Amortized Cost | 192,685 | 235,463
Gross Unrealized Gains | 860 | 94
Gross Unrealized Losses |  | (10)
Estimated Fair Value | 193,545 | 235,547
Total Short-term Investments |  |
Fair Value |  |
Amortized Cost | 192,685 | 235,463
Gross Unrealized Gains | 860 | 94
Gross Unrealized Losses | 0 | (10)
Estimated Fair Value | 193,545 | 235,547
Total Cash and Cash Equivalents and Investments |  |
Fair Value |  |
Amortized Cost | 248,277 | 271,575
Gross Unrealized Gains | 860 | 94
Gross Unrealized Losses | 0 | (10)
Estimated Fair Value | $ 249,137 | $ 271,659

X
- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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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. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References No definition available. + Details
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