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Commitments and Contingencies (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) ft² | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Leases [Abstract] |  |  |
Area of leased property (in square feet) | ft² | 19,467 |  |
Rent expenses under the operating leases | $ 302,000 | $ 331,000 | $ 313,000
Term of royalty agreement | 8 years |  |
Aggregate amount payable towards royalty | $ 7,000,000 |  |
Royalty expense | 526,000 | 447,000 | 583,000
Credit of royalty expense | 49,000 | $ 128,000 | $ 217,000
Operating leases |  |  |
2018 | 185,000 |  |
2019 | 176,000 |  |
2020 | 164,000 |  |
2021 | 12,000 |  |
2022 | 12,000 |  |
Total | 549,000 |  |
Royalty agreement |  |  |
Remaining royalty payments due | 575,000 |  |
Dingxing |  |  |
Leases [Abstract] |  |  |
Total investment agreement value | 90,000,000 |  |
Kazuo |  |  |
Leases [Abstract] |  |  |
Total investment agreement value | $ 15,000,000 |  |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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