3. BALANCE SHEET DETAIL - Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018
Prepaid expenses and other current assets:
Prepaid tooling and masks	$ 271	$ 163
Escrow deposit	750	750
Other receivables	514	370
Other prepaid expenses and other current assets	579	797
Total prepaid expenses and other current assets	$ 2,114	$ 2,080