Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 69,393	$ 83,560
Accounts receivable, net	2,132	2,488
Inventory	4,821	2,558
Prepaid expenses and other current assets	3,815	3,933
Total current assets	80,161	92,539
Property and equipment, net	4,412	4,262
Goodwill	2,715	2,715
Other intangible assets, net	3,013	3,256
Total assets	90,301	102,772
Current liabilities:
Accounts payable and accrued liabilities	19,063	19,501
Notes payable, current maturities, net	9,707	6,707
Deferred revenue, current	1,640	1,875
Total current liabilities	30,410	28,083
Notes payable, less current maturities, net	19,267	22,168
Deferred revenue, long-term	20,000	20,000
Other long-term liabilities	825	825
Total liabilities	$ 70,502	$ 71,076
Commitments and contingencies (Notes 7 and 11)
Stockholders' equity:
Preferred Stock, $.001 par value; 5,000,000 shares authorized; 2,093,155 shares of Series A Non-Voting Convertible Preferred Stock outstanding at March 31, 2016 and December 31, 2015	$ 2	$ 2
Common Stock, $.001 par value; 75,000,000 shares authorized; 53,610,470 and 52,730,799 shares issued; 53,594,979 and 52,715,308 shares outstanding at March 31, 2016 and December 31, 2015, respectively	54	53
Additional paid-in capital	281,726	274,891
Treasury stock, at cost, 15,491 shares	(47)	(47)
Accumulated deficit	(261,936)	(243,203)
Total stockholders' equity	19,799	31,696
Total liabilities and stockholders' equity	$ 90,301	$ 102,772