Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 14,780	$ 23,379
Accounts receivable, net	5,568	7,522
Inventory	8,318	9,097
Prepaid expenses and other current assets	222	688
Total current assets	28,888	40,686
Property and equipment, net	3,558	4,286
Right-of-use assets	2,595
Other assets	73	73
Total assets	35,114	45,045
Current liabilities:
Accounts payable	3,178	2,637
Accrued liabilities	3,167	5,001
Current portion of long-term debt	72	5,977
Operating lease liabilities	1,606
Other liabilities	48
Total current liabilities	8,071	13,615
Long-term debt, net of current portion	7,676	6,509
Operating lease liabilities, net of current portion	1,307
Total liabilities	17,054	20,124
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.0001 par value per share; 5,000,000 shares authorized; no shares issued and outstanding as of September 30, 2019 and December 31, 2018
Common stock, $0.0001 par value per share; 100,000,000 shares authorized; 17,535,746 and 17,095,456 shares issued and outstanding as of September 30, 2019 and December 31, 2018	2	2
Additional paid-in capital	163,640	158,912
Accumulated deficit	(145,582)	(133,993)
Total stockholders’ equity	18,060	24,921
Total liabilities and stockholders’ equity	$ 35,114	$ 45,045