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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Measurements [Abstract] |
Fair Value, Assets Measured on Recurring Basis and Non-Recurring Basis | ﻿ ﻿
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﻿Recurring Fair Value Measurements |  | As of March 31, 2018
﻿ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿ASSETS: |  |  |  |  |  |  |  |
﻿Cash equivalents | $ | 38,497 | $ | - | $ | - | $ | 38,497
﻿Restricted certificates of deposit | $ | 5,452 | $ | - | $ | - | $ | 5,452
﻿Escrow receivable | $ | - | $ | - | $ | 1,420 | $ | 1,420
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﻿ ﻿ ﻿ ﻿ ﻿
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﻿Recurring Fair Value Measurements |  | As of December 31, 2017
﻿ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿ASSETS: |  |  |  |  |  |  |  |
﻿Cash equivalents | $ | 45,542 | $ | - | $ | - | $ | 45,542
﻿Restricted certificates of deposit | $ | 5,720 | $ | - | $ | - | $ | 5,720
﻿Escrow receivable | $ | - | $ | - | $ | 1,420 | $ | 1,420
﻿ |  |  |  |  |  |  |  |
﻿Non-Recurring Fair Value Measurements |  | As of December 31, 2017
﻿ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
﻿ASSETS: |  |  |  |  |  |  |  |
﻿Property, plant and equipment | $ | - | $ | - | $ | $1,434 | $ | 1,434
﻿ ﻿ ﻿

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- Definition Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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