CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 5,330	$ 8,766
Short-term investments	240	1,002
Accounts receivable, net	710	559
Inventories	1,055	1,451
Prepaid expenses and other	321	473
Total current assets	7,656	12,251
Property and equipment, net	1,078	1,274
Goodwill	13,276	13,276
Intangible assets, net	195	223
Other	123	121
Total assets	22,328	27,145
Current liabilities
Accounts payable	402	561
Accrued expenses and other	1,913	2,773
Total current liabilities	2,315	3,334
Convertible notes payable	8,699	8,250
Other long-term liabilities	226	233
Total liabilities	11,240	11,817
Commitments and contingencies (Note 4)
Stockholders' equity
Preferred stock, $0.01 par value; 20,000 shares authorized; none issued and outstanding
Common stock, $0.001 par value; 120,000 shares authorized; 6,677 shares and 6,630 shares issued and outstanding at March 31, 2017 and December 31, 2016 respectively	7	7
Additional paid-in capital	229,506	229,341
Accumulated deficit	(218,425)	(214,020)
Total stockholders' equity	11,088	15,328
Total liabilities and stockholders' equity	$ 22,328	$ 27,145