Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 46,014 $ 63,961
Restricted cash 11,219 4,012
Accounts receivable 11,923 22,650
Inventory 29,940 32,752
Prepaid expenses and other current assets 11,837 7,855
Total current assets 110,933 131,230
Restricted cash 43,403 43,823
Property, plant, and equipment, net of accumulated depreciation of $29,204 and $27,970, respectively 8,246 7,255
Leased property, net 54,060 1,667
Goodwill 8,291 8,478
Intangible assets, net 3,933 4,644
Other assets 11,966 12,359
Total assets 240,832 209,456
Current liabilities:    
Accounts payable 32,112 20,455
Accrued expenses 8,519 9,852
Accrual for loss contracts related to service 752 4,100
Deferred revenue 5,736 4,468
Finance obligations 14,787 2,671
Current portion of long-term debt 2,964  
Other current liabilities 1,615 1,160
Total current liabilities 66,485 42,706
Accrual for loss contracts related to service   5,950
Deferred revenue 17,413 13,997
Common stock warrant liability 11,387 5,735
Finance obligations 29,767 14,809
Long-term debt 20,829  
Other liabilities 241 370
Total liabilities 146,122 83,567
Stockholders' equity:    
Common stock, $0.01 par value per share; 450,000,000 shares authorized; Issued (including shares in treasury): 181,009,135 at September 30, 2016 and 180,567,444 at December 31, 2015 1,917 1,806
Additional paid-in capital 1,137,482 1,118,917
Accumulated other comprehensive income 247 798
Accumulated deficit (1,051,467) (993,876)
Less common stock in treasury: 582,328 at December 31, 2016 and 479,953 December 31, 2015 (3,091) (2,909)
Total stockholders' equity 85,088 124,736
Total liabilities, redeemable preferred stock, and stockholders' equity 240,832 209,456
Series C Redeemable Convertible Preferred Stock    
Redeemable preferred stock    
Redeemable preferred stock 1,153 $ 1,153
Series D Redeemable Convertible Preferred Stock    
Redeemable preferred stock    
Redeemable preferred stock $ 8,469