Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 28,005	$ 25,941
Accounts receivable	80	236
Inventory	6,851	2,207
Prepaid expenses and other current assets	874	936
Total current assets	35,810	29,320
Property and equipment - net	506	611
Deferred tax assets	575	560
Lease assets	365
Other assets	204	215
Total assets	37,460	30,706
Current liabilities:
Accounts payable	1,500	1,063
Accrued liabilities	1,048	718
Liability related to early exercised stock options	85	136
Customer deposits	3,398	2
Lease liabilities	374
Total current liabilities	6,405	1,919
Other liabilities	106	156
Total liabilities	6,511	2,075
Commitments and contingencies (Note 5)
Stockholders’ equity
Preferred stock, par value $0.0001 per share - 5,000,000 shares authorized as of September 30, 2019 and December 31, 2018; nil shares issued and outstanding as of September 30, 2019 and December 31, 2018
Common stock, par value $0.0001 per share - 75,000,000 shares authorized as of September 30, 2019 and December 31, 2018; 17,369,590 and 17,130,507 shares issued and outstanding as of September 30, 2019 and December 31, 2018, respectively	2	2
Additional paid-in-capital	20,502	19,358
Retained earnings	10,445	9,271
Total stockholders’ equity	30,949	28,631
Total liabilities and stockholders’ equity	$ 37,460	$ 30,706