Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents, (notes 1 and 8)	$ 42,486	$ 63,961
Restricted cash	5,075	4,012
Accounts receivable	12,006	22,650
Inventory	35,794	32,752
Prepaid expenses and other current assets	11,511	7,855
Total current assets	106,872	131,230
Restricted cash	40,852	43,823
Property, plant, and equipment, net of accumulated depreciation of $29,204 and $27,970, respectively	8,485	7,255
Leased property, net of accumulated depreciation of $3,280 and $1,700, respectively	42,622	1,667
Goodwill	8,838	8,478
Intangible assets, net of accumulated amortization of $921 and $469, respectively	4,308	4,644
Other assets	12,008	12,359
Total assets	223,985	209,456
Current liabilities:
Accounts payable	28,612	20,455
Accrued expenses	8,791	9,852
Accrual for loss contracts related to service	2,600	4,100
Deferred revenue	4,227	4,468
Finance obligations	10,472	2,671
Other current liabilities	1,734	1,160
Total current liabilities	56,436	42,706
Accrual for loss contracts related to service	634	5,950
Deferred revenue	12,203	13,997
Common stock warrant liability	885	5,735
Finance obligations	35,258	14,809
Long-term debt	23,541
Other liabilities	257	370
Total liabilities	129,214	83,567
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 September 30, 2016 and December 31, 2015	1,153	1,153
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	1,810	1,806
Additional paid-in capital	1,126,007	1,118,917
Accumulated other comprehensive income	1,115	798
Accumulated deficit	(1,032,230)	(993,876)
Less common stock in treasury: 577,376 at September 30, 2016 and 479,953 December 31, 2015	(3,084)	(2,909)
Total stockholders' equity	93,618	124,736
Total liabilities, redeemable preferred stock, and stockholders' equity	$ 223,985	$ 209,456