Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 109,139 $ 146,205
Accounts receivable 12,524 16,095
Inventory 32,889 24,736
Prepaid expenses and other current assets 5,950 5,710
Total current assets 160,502 192,746
Restricted cash 11,634 500
Property, plant, and equipment, net of accumulated depreciation of $27,218 and $26,539 respectively 5,989 5,312
Leased property under capital lease, net of accumulated depreciation of $1,420 and $1,162 respectively 1,679 1,937
Note receivable 415 447
Intangible assets, net 768 1,490
Other assets 1,967 1,719
Total assets 182,954 204,151
Current liabilities:    
Accounts payable 12,188 10,185
Accrued expenses 5,655 8,750
Product warranty reserve 1,006 1,311
Deferred revenue 3,494 3,319
Obligations under capital lease 200 587
Other current liabilities 2,199 1,555
Total current liabilities 24,742 25,707
Deferred revenue 6,114 6,772
Common stock warrant liability 6,982 9,418
Finance obligation 2,391 2,426
Other liabilities   392
Total liabilities 40,229 44,715
Redeemable preferred stock    
Series C redeemable convertible preferred stock, $0.01 par value per share (aggregate involuntary liquidation preference $16,664) 10,431 shares authorized; Issued and outstanding: 5,231 at June 30, 2015 and December 31, 2014 1,153 1,153
Stockholders' equity:    
Common stock, $0.01 par value per share; 450,000,000 shares authorized; Issued (including shares in treasury): 173,827,314 at June 30, 2015 and 173,644,532 at December 31, 2014 1,738 1,736
Additional paid-in capital 1,100,009 1,096,392
Accumulated other comprehensive income 898 898
Accumulated deficit (958,411) (938,081)
Less common stock in treasury: 378,116 at June 30, 2015 and at December 31, 2014 (2,662) (2,662)
Total stockholders' equity 141,572 158,283
Total liabilities, redeemable preferred stock, and stockholders' equity $ 182,954 $ 204,151