CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 1,268	$ 774
Marketable securities (Note 6)	9,651	11,322
Accounts receivable, net of allowances of $7 and $5	109	76
Accrued investment income	53	66
Inventories, net (Note 7)	217	304
Prepaid expenses and other current assets	623	471
Other current deferred assets	3	218
Total current assets	11,924	13,231
Property, plant and equipment, net	1,121	957
Intangible asset, net of accumulated amortization of $258 and $155 (Note 3)	1,742	1,845
Other assets	175	0
Total assets	14,962	16,033
Current liabilities:
Accounts payable	261	217
Accrued expenses (Note 8)	863	568
Other current liabilities	49	26
Accrued interest	65	70
Sales returns liability	195	0
Deferred revenue	0	353
Current maturities of long-term debt (Note 9)	2,419	1,758
Total current liabilities	3,852	2,992
Long-term debt, net of discount of $251 and $281, and debt issuance costs of $128 and $162 (Note 9)	6,629	7,799
Long-term portion of accrued interest	291	190
Total liabilities	$ 10,772	$ 10,981
Commitments and contingencies (Note 15)
Stockholders' equity:
Common stock: $.01 par value per share; 100,000 shares authorized, 49,217 and 48,848 shares issued and outstanding at 2015 and 2014, respectively	$ 492	$ 488
Additional paid-in capital	367,456	366,898
Accumulated deficit	(363,745)	(362,321)
Accumulated other comprehensive loss	(13)	(13)
Total stockholders' equity	4,190	5,052
Total liabilities and stockholders' equity	$ 14,962	$ 16,033