Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 63,459	$ 70,472
Accounts receivable, net	3,031	3,141
Inventory	2,550	1,828
Prepaid expenses and other current assets	2,704	2,882
Total current assets	71,744	78,323
Property and equipment, net	3,948	3,890
Goodwill	2,715	2,715
Other intangible assets, net	3,984	4,226
Other assets	78	157
Total assets	82,469	89,311
Current liabilities:
Accounts payable and accrued liabilities	14,512	14,429
Notes payable, current maturities	8,000	8,000
Deferred revenue, current	7,075	6,772
Total current liabilities	29,587	29,201
Notes payable, less current maturities, net	2,256	4,173
Deferred revenue, long-term	45	841
Other long-term liabilities	734	700
Total liabilities	32,622	34,915
Commitments and contingencies (Notes 6 and 10)
Stockholders' equity:
Preferred Stock, $.001 par value; 5,000,000 shares authorized; 2,093,155 and 2,139,000 shares of Series A Non-Voting Convertible Preferred Stock outstanding at March 31, 2015 and December 31, 2014, respectively.	2	2
Common Stock, $.001 par value; 75,000,000 shares authorized; 52,381,638 and 51,603,070 shares issued; 52,366,147 and 51,587,579 shares outstanding at March 31, 2015 and December 31, 2014, respectively	53	52
Additional paid-in capital	263,563	259,920
Treasury stock, at cost, 15,491 shares	(47)	(47)
Accumulated deficit	(213,724)	(205,531)
Total stockholders' equity	49,847	54,396
Total liabilities and stockholders' equity	$ 82,469	$ 89,311