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Subsequent Events - (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 24 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2018 | Sep. 30, 2018 USD ($) | Jul. 31, 2018 payment $ / shares shares | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) | Aug. 08, 2018 USD ($) | Dec. 31, 2017 payment | May 04, 2017 payment
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Research and development expense | $ |  |  |  | $ 6,773 | $ 6,427 | $ 13,253 | $ 12,816 |  |  |  |
Global Foundries | Joint Development Agreement |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Research and development expense | $ |  |  |  | $ 2,300 | $ 1,400 | $ 4,400 | $ 3,200 |  |  |  |
Subsequent Events | Silterra | Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Non-recurring engineering cost obligation | $ |  | $ 1,000 |  |  |  |  |  |  |  |  |
Subsequent Events | Global Foundries | Joint Development Agreement |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Additional extension related to an SOW that extends beyond the extended term | 3 months |  |  |  |  |  |  |  |  |  |
Subsequent Events | Arizona manufacturing facility |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Total minimum lease payments | $ |  |  |  |  |  |  |  |  | $ 2,400 |  |
Subsequent Events | Maximum | Global Foundries | Joint Development Agreement | Forecast |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Research and development expense | $ |  |  |  |  |  |  |  | $ 5,800 |  |  |
2017 Credit Facility |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Number of interest and principal payments | payment |  |  |  |  |  |  |  |  |  | 24 |
End-of-term fee (as a percent) |  |  |  |  |  |  |  |  |  |  | 6.00%
2017 Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Number of interest and principal payments | payment |  |  |  |  |  |  |  |  |  |  | 24
2017 Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Number of interest and principal payments | payment |  |  |  |  |  |  |  |  |  |  | 36
2017 Credit Facility | Subsequent Events |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
End-of-term fee (as a percent) |  |  | 7.00% |  |  |  |  |  |  |  |
Number of shares the warrant can be converted to | shares |  |  | 9,375 |  |  |  |  |  |  |  |
Warrant exercise price | $ / shares |  |  | $ 8.91 |  |  |  |  |  |  |  |
Warrant exercise expiration period |  |  | 5 years |  |  |  |  |  |  |  |
2017 Credit Facility | Subsequent Events | Minimum |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Number of interest and principal payments | payment |  |  | 24 |  |  |  |  |  |  |  |
2017 Credit Facility | Subsequent Events | Maximum |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Number of interest and principal payments | payment |  |  | 36 |  |  |  |  |  |  |  |
SVB Credit Facility | Subsequent Events |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Number of shares the warrant can be converted to that was cancelled | shares |  |  | 9,229 |  |  |  |  |  |  |  |

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