Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 31,438	$ 12,950
Accounts receivable, net	5,582	4,041
Inventory	9,482	9,837
Prepaid expenses and other current assets	436	590
Total current assets	46,938	27,418
Property and equipment, net	4,438	3,946
Other assets	73	73
Total assets	51,449	31,437
Current liabilities:
Accounts payable	2,847	2,920
Accrued liabilities	8,588	3,748
Deferred income on shipments to distributors		1,720
Current portion of long-term debt	4,472	3,987
Total current liabilities	15,907	12,375
Long-term debt, net of current portion	7,928	8,178
Total liabilities	23,835	20,553
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, 2018 and December 31, 2017
Common stock, $0.0001 par value per share; 100,000,000 shares authorized; 17,065,846 and 12,817,201 shares issued and outstanding as of September 30, 2018 and December 31, 2017	2	1
Additional paid-in capital	158,125	128,422
Accumulated deficit	(130,513)	(117,539)
Total stockholders' equity	27,614	10,884
Total liabilities and stockholders' equity	$ 51,449	$ 31,437