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Short-term Investments | 6 Months Ended
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Jun. 30, 2019
Short Term Investments [Abstract] |
Short-term Investments | (3) Short-term Investments The Company periodically invests a portion of its excess cash in short-term investment instruments. All of the Company’s short-term investments are in U.S. Treasury securities and all short-term investments have stated maturity dates between three months and one year from the purchase date. All short-term investments are included within “Short-term investments” on the accompanying Consolidated Balance Sheets. The fair value of the Company’s short-term investments is determined based on quoted market prices in active markets for identical securities (Level 1 inputs). As of June 30, 2019 and December 31, 2018, all short-term investments were classified as available-for-sale and reported at fair value. The amortized cost and fair value of available-for-sale investments at June 30, 2019 were $313.1 million and $313.3 million, respectively. The amortized cost and fair value of available-for-sale investments at December 31, 2018 were $466.6 million and $466.2 million, respectively. The total gross unrecognized holding losses accumulated in other comprehensive loss were not material as of June 30, 2019 and December 31, 2018. The total gross unrecognized holding gains accumulated in other comprehensive loss were not material as of June 30, 2019 and December 31, 2018. No other-than-temporary impairments related to these investments have been recognized as of June 30, 2019 and December 31, 2018.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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