Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	[1]
Current assets:
Cash and cash equivalents	$ 9,506,000	$ 29,523,000
Accounts receivable, net of allowance for doubtful accounts of $469 and $284 as of June 30, 2019 and December 31, 2018, respectively	3,556,000	5,704,000
Inventory	4,714,000	4,119,000
Prepaid expenses and other current assets	2,768,000	2,558,000
Total current assets	20,544,000	41,904,000
Property and equipment, net	2,726,000	2,916,000
Investment in limited liability company	1,580,000	1,843,000
Other assets	646,000	171,000
Total assets	25,496,000	46,834,000
Current liabilities:
Accounts payable	1,606,000	3,994,000
Accrued liabilities	5,278,000	6,766,000
Total current liabilities	6,884,000	10,760,000
Note payable, noncurrent portion	31,271,000	30,528,000
Other noncurrent liabilities	1,010,000	634,000
Total liabilities	39,165,000	41,922,000
Commitments and contingences (Note 8)
Stockholders’ equity (deficit):
Common stock, $0.0001 par value; 75,000,000 shares authorized as of June 30, 2019 and December 31, 2018; 46,574,958 and 46,363,945 shares issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	5,000	5,000
Additional paid-in capital	161,464,000	160,292,000
Accumulated deficit	(175,138,000)	(155,385,000)
Total stockholders’ equity (deficit)	(13,669,000)	4,912,000
Total liabilities and stockholders’ equity (deficit)	$ 25,496,000	$ 46,834,000

[1] The condensed consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date.