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Leases
 3 Months Ended
Mar. 31, 2018
Leases [Abstract]  
Leases

ACM entered into a two-year lease agreement in March 2015 for office and warehouse space of approximately 3,000 square feet for its headquarters in Fremont, California, at a rate of $2 per month. On March 22, 2017, ACM amended the lease agreement to extend the term through March 31, 2019 and increase the base rent to $3 per month.

 

ACM Shanghai entered into an operating lease agreement with Zhangjiang Group (a related party, see note 11) in 2007 for manufacturing and office space of approximately 63,510 square feet in Shanghai, China. The lease with Zhangjiang Group expired on December 31, 2017 and as of March 31, 2018, ACM Shanghai was leasing the property on a month-to-month basis. On April 26, 2018, ACM Shanghai entered into a renewed lease with Zhangjiang Group for the period from January 1, 2018 through December 31, 2022. Under the lease, ACM Shanghai will pay a monthly rental fee of approximately RMB366.

 

ACM Wuxi leases office space in Wuxi, PRC. The lease for ACM Wuxi’s office space was renewed on April 1, 2018 with a two-year term expiring on March 31, 2020. The monthly rental fee is RMB50.

On December 5, 2017 ACM Korea entered into a lease for its office space with a two- year term expiring on December 4, 2019. The monthly rental fee is KRW1,200. On February 5, 2018, ACM Korea entered into a lease for its R&D facility with two-year term expiring on February 18, 2020. The monthly rental fee is KRW1,800.

 

Future minimum lease payments under non-cancelable lease agreements as of March 31, 2018 and December 31, 2017 were as follows:

 

   

March 31,

2018

    

December 31,

2017

  
2018    $ 766     $ 50  
2019      739       22  
2020      716       ─  
2021      716       ─  
2022      716       ─  
Total    $ 3,654     $ 72  

 

Rent expense was $495 and $315 for the three months ended March 31, 2018 and 2017, respectively.