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Investments | 12 Months Ended
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Dec. 31, 2017
Investments [Abstract] |
Investments | 4. INVESTMENTS Investments as of December 31, 2017 consisted of the following: ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  | Unrealized |  |  |
﻿ |  |  |  |  | Gains |  |  |
﻿ |  | Cost Basis |  | (Losses) |  | Fair Value
﻿Corporate bonds |  | $ | 2,925 |  | $ | (5) |  | $ | 2,920
﻿U.S. government agencies and securities |  |  | 3,000 |  |  | (1) |  |  | 2,999
﻿Commercial paper |  |  | 6,723 |  |  | — |  |  | 6,723
﻿Total |  | $ | 12,648 |  | $ | (6) |  | $ | 12,642
﻿ Investments as of December 31, 2016 consisted of the following: ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  | Unrealized |  |  |
﻿ |  |  |  |  | Gains |  |  |
﻿ |  | Cost Basis |  | (Losses) |  | Fair Value
﻿Corporate bonds |  | $ | 8,284 |  | $ | (8) |  | $ | 8,276
﻿U.S. government agencies and securities |  |  | 8,542 |  |  | (13) |  |  | 8,529
﻿Commercial paper |  |  | 5,996 |  |  | — |  |  | 5,996
﻿Total |  | $ | 22,822 |  | $ | (21) |  | $ | 22,801
﻿ The Company has not experienced any significant realized gains or losses on its investments in the periods presented in the Consolidated Statements of Operations and Comprehensive Loss. Long term investments held by the Company at December 31, 2016 had maturities between one and two years.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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