pre_text: 4. PREPAID EXPENSES Prepaid expenses consisted of the following at December 31, 2019 and 2018 (in thousands):  Prepaid expenses consisted of the following at December 31, 2019 and 2018 (in thousands):  Prepaid expenses consisted of the following at December 31, 2019 and 2018 (in thousands): In 2018, we recorded impairment charges of approximately$0.4 million related to prepaid licenses and production tooling as a result of the restructuring of our operations. These charges are included in “Restructuring expenses” in the accompanying statements of comprehensive loss (see Note 15).
table: 2019 2018
table: Prepaid services $221 $252
table: Prepaid bonds for German statutory costs 188 199
table: Prepaid insurance 62 19
table: Prepaid licenses, software tools and support 17 51
table: Other prepaid expenses 17 17
table: $505 $538
question: Analyse this data from a financial earnings document. What is the % change in the prepaid services amount from 2018 to 2019?