Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 20,824	$ 10,006
Accounts receivables	60	79
Inventory	2,828	2,583
Prepaid expenses and other current assets	487	273
Total current assets	24,199	12,941
Property and equipment - net	332	401
Deferred tax assets	1,157	1,022
Other assets	150	1,188
Total assets	25,838	15,552
Current liabilities:
Accounts payable	1,372	777
Accrued liabilities	1,162	481
Liability related to early exercised stock options	153	223
Customer deposits	100	745
Total current liabilities	2,787	2,226
Other liabilities	131	90
Total liabilities	2,918	2,316
Commitments and contingencies (Note 5)
Stockholders’ equity
Convertible preferred stock, value		8,794
Additional paid-in-capital	15,592	813
Retained earnings	7,326	3,629
Total stockholders’ equity	22,920	13,236
Total liabilities and stockholders’ equity	25,838	15,552
Series Seed Convertible Preferred Stock
Stockholders’ equity
Convertible preferred stock, value		1,156
Series A Convertible Preferred Stock
Stockholders’ equity
Convertible preferred stock, value		4,477
Series B Convertible Preferred Stock
Stockholders’ equity
Convertible preferred stock, value		$ 3,161
Common Stock, Par Value
Stockholders’ equity
Common stock, value	$ 2