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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