Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 12,975	$ 13,901
Accounts receivable, net	6,154	7,538
Inventories	3,937	3,623
Prepaid expenses and other current assets	2,033	872
Total current assets	25,099	25,934
Property and equipment, net	12,184	12,850
Intangible assets, net	1,236	1,598
Goodwill	9,055	10,010
Other assets	168	185
Total assets	47,742	50,577
Liabilities and Stockholders' Equity
Accounts payable	3,831	2,004
Accrued expenses and other	3,476	3,430
Deferred revenue	6,014	4,167
Notes payable	219	238
Total current liabilities	13,540	9,839
Deferred revenue, net of current portion	214	710
Notes payable, net of current portion	2,503	2,897
Other noncurrent liabilities	77	69
Total liabilities	16,334	13,515
Commitments and contingencies (See Note 5)
Contingently redeemable series C preferred stock, 0.55 shares issued and outstanding (liquidation preference of $550)	550	550
Stockholders' 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; 12,216 issued and 10,803 outstanding at June 30, 2016 and 12,215 issued and 10,802 outstanding at December 31, 2015, respectively	122	122
Additional paid-in capital	289,926	289,464
Treasury stock, at cost (1,413 shares)	(8,601)	(8,601)
Accumulated deficit	(247,222)	(243,311)
Accumulated other comprehensive loss	(3,367)	(1,162)
Total stockholders' equity	30,858	36,512
Total liabilities and stockholders' equity	$ 47,742	$ 50,577