Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 19,207	$ 8,086	[1]
Accounts receivable	4,833	2,091	[1]
Inventory	1,903	2,687	[1]
Prepaid expenses and other current assets	3,217	1,066	[1]
Total current assets	29,160	13,930	[1]
Property and equipment, net	1,337	483	[1]
Investment in limited liability company	2,500
Other assets	112	136	[1]
Total assets	33,109	14,549	[1]
Current liabilities:
Accounts payable	3,569	3,086	[1]
Accrued liabilities	3,933	2,186	[1]
Note payable, current portion		1,867	[1]
Total current liabilities	7,502	7,139	[1]
Note payable, noncurrent portion	18,665	7,762	[1]
Other noncurrent liabilities	77	53	[1]
Total liabilities	26,244	14,954	[1]
Commitments and contingences (Note 7)
Stockholders’ equity (deficit):
Preferred stock, $0.0001 par value; 10,000,000 shares authorized as of September 30, 2017 and December 31, 2016; no shares issued
Common stock, $0.0001 par value; 75,000,000 shares authorized as of September 30, 2017 and December 31, 2016; 19,418,531 and 10,661,201 shares issued and outstanding as of September 30, 2017 and December 31, 2016, respectively	2	1	[1]
Additional paid-in capital	102,220	68,216	[1]
Accumulated deficit	(95,357)	(68,622)	[1]
Total stockholders’ equity (deficit)	6,865	(405)	[1]
Total liabilities and stockholders’ equity (deficit)	$ 33,109	$ 14,549	[1]

[1] The condensed consolidated balance sheet as of December 31, 2016 has been derived from the audited consolidated financial statements as of that date.