Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 21,536	$ 10,006
Accounts receivable	93	79
Inventory	2,847	2,583
Prepaid expenses and other current assets	978	273
Total current assets	25,454	12,941
Property and equipment - net	325	401
Deferred tax assets	652	1,022
Other assets	161	1,188
Total assets	26,592	15,552
Current liabilities:
Accounts payable	760	777
Accrued liabilities	573	481
Liability related to early exercised stock options	152	223
Customer deposits	6	745
Total current liabilities	1,491	2,226
Other liabilities	133	90
Total liabilities	1,624	2,316
Commitments and contingencies (Note 5)
Stockholders’ equity
Preferred stock, value		8,794
Additional paid-in-capital	17,580	813
Retained earnings	7,386	3,629
Total stockholders’ equity	24,968	13,236
Total liabilities and stockholders’ equity	26,592	15,552
Convertible Preferred Stock
Stockholders’ equity
Preferred stock, value
Total stockholders’ equity		8,794
Series Seed Convertible Preferred Stock
Stockholders’ equity
Preferred stock, value		1,156
Series A Convertible Preferred Stock
Stockholders’ equity
Preferred stock, value		4,477
Series B Convertible Preferred Stock
Stockholders’ equity
Preferred stock, value		3,161
Preferred Stock, Par Value
Stockholders’ equity
Preferred stock, value
Common Stock, Par Value
Stockholders’ equity
Common stock, value	$ 2