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v3.19.1

Commitments and Contingencies (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) ft² | Mar. 31, 2018 USD ($)
Product Warranty [Abstract] |  |
Period of warranty | 12 months |
Change in warranty accrual [Roll Forward] |  |
Beginning accrued product warranty | $ 236 | $ 133
Accruals for warranties issued | 127 | 59
Adjustments related to pre-existing warranties including expirations and changes in estimates | 93 | (46)
Cost of warranty repair | (131) | (29)
Ending accrued product warranty | $ 325 | $ 117
Leases |  |
Area of property under long-term operating lease (in square feet) | ft² | 19,467 |
Term of royalty agreement | 8 years |
Dingxing |  |
Leases |  |
Total investment agreement value | $ 90,000 |
Kazuo |  |
Leases |  |
Total investment agreement value | 15,000 |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment | Kazuo |  |
Leases |  |
Total investment agreement value | $ 8,000 |

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