6. Prepaid Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid corporate insurance	$ 107	$ 43
Prepaid software services	121	28
Prepaid tax liability deposit	45	48
Prepaid inventory deposits	0	61
Other prepaid expenses	48	55
Total prepaid assets	$ 321	$ 244