Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents	$ 64,315	$ 8,237
Accounts receivable, net	1,320	517
Inventories	2,097	1,196
Prepaid expenses and other current assets	1,501	92
Total current assets	69,233	10,042
Property and equipment, net	4,757	1,159
Other non-current assets	45	68
TOTAL ASSETS	74,035	11,269
Current Liabilities
Accounts payable	1,125	426
Accrued expenses	2,809	324
Current portion of deferred revenue	1,723	1,714
Current portion of equipment financing	293	44
Other current liabilities		125
Total current liabilities	5,950	2,633
Deferred revenue	767	775
Equipment financing	557	19
Stock-based compensation liability		15,376
Other liabilities	56	81
Total liabilities	7,330	18,884
Commitments and contingencies (Note 12)
Stockholders’ Equity (Deficit)
Preferred stock, $0.0001 par value, 10,000,000 and 0 shares authorized at December 31, 2018 and 2017, respectively; none issued
Common stock, $0.0001 par value, 300,000,000 shares and 25,000,000 authorized at December 31, 2018 and 2017, respectively; 12,689,251 and 7,888,170 issued and outstanding at December 31, 2018 and 2017, respectively	1	1
Additional paid-in capital	126,925	21,773
Accumulated deficit	(60,221)	(29,389)
Total stockholders’ equity (deficit)	66,705	(7,615)
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)	$ 74,035	$ 11,269