Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 83,560 $ 70,472
Accounts receivable, net 2,488 3,141
Inventory 2,558 1,828
Prepaid expenses and other current assets 3,933 2,568
Total current assets 92,539 78,009
Property and equipment, net 4,262 3,890
Goodwill 2,715 2,715
Other intangible assets, net 3,256 4,226
Total assets 102,772 88,840
Current liabilities:    
Accounts payable and accrued liabilities 19,501 14,429
Notes payable, current maturities, net 6,707 8,000
Deferred revenue, current 1,875 6,772
Total current liabilities 28,083 29,201
Notes payable, less current maturities, net 22,168 3,702
Deferred revenue, long-term 20,000 841
Other long-term liabilities 825 700
Total liabilities $ 71,076 $ 34,444
Commitments and contingencies (Notes 7 and 14)
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 December 31, 2015 and 2014, respectively. $ 2 $ 2
Common Stock, $.001 par value; 75,000,000 shares authorized; 52,730,799 and 51,603,070 shares issued; 52,715,308 and 51,587,579 shares outstanding at December 31, 2015 and 2014, respectively 53 52
Additional paid-in capital 274,891 259,920
Treasury stock, at cost, 15,491 shares (47) (47)
Accumulated deficit (243,203) (205,531)
Total stockholders' equity 31,696 54,396
Total liabilities and stockholders' equity $ 102,772 $ 88,840