Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 16,130	$ 16,762
Accounts receivable, net	6,466	5,289
Inventories	3,779	3,201
Prepaid expenses and other current assets	2,267	1,134
Total current assets	28,642	26,386
Property and equipment, net	12,917	13,041
Intangible assets, net	1,952	2,182
Goodwill	10,629	10,503
Other assets	91	96
Total assets	54,231	52,208
Liabilities and Shareholders' Equity
Accounts payable	2,997	2,873
Accrued expenses	3,987	1,918
Deferred revenue	964	914
Notes payable	249	243
Total current liabilities	8,197	5,948
Deferred revenue, net of current portion	1,215	1,553
Notes payable, net of current portion	3,203	3,289
Total liabilities	$ 12,615	$ 10,790
Commitments and contingencies
Shareholders' equity:
Preferred stock, $0.01 par value; 1,000 shares authorized Series B convertible preferred stock, 0.13 shares issued and outstanding (liquidation preference of $13)
Common stock $0.01 par value; 150,000 shares authorized; 12,202 issued and 10,791 outstanding at June 30, 2015 and 12,186 issued and 10,775 outstanding at December 31, 2014	$ 122	$ 122
Additional paid-in capital	288,634	287,660
Treasury stock, at cost (1,411 shares)	(8,579)	(8,579)
Accumulated deficit	(239,290)	(238,272)
Accumulated other comprehensive loss	179	(63)
Total shareholders' equity	41,066	40,868
Total liabilities and shareholders' equity	54,231	52,208
Series C Preferred Stock [Member]
Liabilities and Shareholders' Equity
Contingently redeemable series C preferred stock, 0.55 shares issued and outstanding (liquidation preference of $550)	$ 550	$ 550