Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 30,657	$ 6,663
Accounts receivable, trade, net of allowance for doubtful accounts of $0 and $6 at December 31, 2018 and 2017, respectively	3,045	1,021
Inventories	3,509	1,847
Prepaid expenses and other current assets	353	400
Total current assets	37,564	9,931
Property and equipment
Leasehold improvements	1,284	1,284
Furniture and computer equipment	706	682
Manufacturing and other equipment	1,657	1,149
Subtotal	3,647	3,115
Less: Accumulated depreciation	(2,328)	(2,009)
Net property and equipment	1,319	1,106
Investment in SAVSU	6,548	1,070
Long-term deposits	36	36
Total assets	45,467	12,143
Current liabilities
Accounts payable	720	691
Accrued expenses and other current liabilities	91	201
Accrued compensation	998	491
Deferred rent, current portion	130	130
Total current liabilities	1,939	1,513
Deferred rent, long-term	349	492
Other long-term liabilities	31	46
Total liabilities	2,319	2,051
Commitments and Contingencies (Note 8)
Shareholders’ equity
Preferred stock, $0.001 par value; 1,000,000 shares authorized, Series A, 4,250 shares designated, and 0 and 4,250 shares issued and outstanding at December 31, 2018 and 2017, respectively
Common stock, $0.001 par value; 150,000,000 shares authorized, 18,547,406 and 14,021,422 shares issued and outstanding at December 31, 2018 and 2017, respectively	19	14
Additional paid-in capital	114,160	84,036
Accumulated deficit	(71,031)	(73,958)
Total shareholders’ equity	43,148	10,092
Total liabilities and shareholders’ equity	$ 45,467	$ 12,143