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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Summary of Components of Marketable Securities | The following is a summary of the components of our marketable securities and the underlying fair value input level tier hierarchy (see long-lived assets below) (in thousands):
|  | As of December 31, 2017 |
|  | Input |  | Amortizied |  |  | Unrealized |  |  | Unrealized |  |  | Market |
|  | Level |  | cost |  |  | gain |  |  | loss |  |  | Value |
U.S. government obligations |  | Level 2 |  | $ | 1,744 |  |  | $ | - |  |  | $ | - |  |  | $ | 1,744 |
Corporate obligations |  | Level 2 |  |  | 16,943 |  |  |  | - |  |  |  | (78 | ) |  |  | 17,021 |
|  |  |  | $ | 18,687 |  |  | $ | - |  |  | $ | (78 | ) |  | $ | 18,765 |
Components of Inventory | The components of inventory are as follows (in thousands):
|  | December 31, |
|  | 2017 |  |  | 2016 |
Raw materials |  | $ | 1,269 |  |  | $ | 1,404 |
Work in process |  |  | 245 |  |  |  | 466 |
Finished goods |  |  | 17 |  |  |  | 866 |
|  | $ | 1,531 |  |  | $ | 2,736 |
Schedule of Fair Value of Financial Instruments |
|  | As of December 31, 2017 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government obligations |  | $ | - |  |  | $ | 1,744 |  |  | $ | - |  |  | $ | 1,744 |
Corporate obligations |  |  | - |  |  |  | 17,021 |  |  |  | - |  |  |  | 17,021 |
|  | $ | - |  |  | $ | 18,765 |  |  | $ | - |  |  | $ | 18,765 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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