Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Sep. 30, 2019	Dec. 31, 2018	[1]
Current assets:
Cash and cash equivalents	$ 9,086,000	$ 29,523,000
Accounts receivable, net of allowance for doubtful accounts of $543 and $284 as of September 30, 2019 and December 31, 2018, respectively	2,806,000	5,704,000
Inventory	4,141,000	4,119,000
Prepaid expenses and other current assets	3,051,000	2,558,000
Total current assets	19,084,000	41,904,000
Property and equipment, net	3,066,000	2,916,000
Investment in limited liability company	1,412,000	1,843,000
Other assets	587,000	171,000
Total assets	24,149,000	46,834,000
Current liabilities:
Accounts payable	1,791,000	3,994,000
Total accrued liabilities	4,457,000	6,766,000
Total current liabilities	6,248,000	10,760,000
Note payable, noncurrent portion	31,694,000	30,528,000
Other noncurrent liabilities	997,000	634,000
Total liabilities	38,939,000	41,922,000
Commitments and contingences (Note 8)
Stockholders’ equity (deficit):
Common stock, $0.0001 par value; 75,000,000 shares authorized as of September 30, 2019 and December 31, 2018; 1,469,789 and 463,630 shares issued and outstanding as of September 30, 2019 and December 31, 2018, respectively
Additional paid-in capital	168,304,000	160,297,000
Accumulated deficit	(183,094,000)	(155,385,000)
Total stockholders’ equity (deficit)	(14,790,000)	4,912,000
Total liabilities and stockholders’ equity (deficit)	$ 24,149,000	$ 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.