Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 11,765	$ 46,014
Restricted cash	14,828	11,219
Accounts receivable	6,902	11,923
Inventory	33,726	29,940
Prepaid expenses and other current assets	10,363	11,837
Total current assets	77,584	110,933
Restricted cash	39,060	43,403
Property, plant, and equipment, net of accumulated depreciation of $30,129 and $29,666, respectively	8,086	8,246
Leased property, net of accumulated amortization of $6,083 and $4,544, respectively	61,857	54,060
Goodwill	8,422	8,291
Intangible assets, net of accumulated amortization of $1,185 and $1,032, respectively	3,844	3,933
Other assets	11,871	11,966
Total assets	210,724	240,832
Current liabilities:
Accounts payable	27,046	32,112
Accrued expenses	6,497	8,519
Accrual for loss contracts related to service		752
Deferred revenue	4,777	5,736
Finance obligations	21,716	14,787
Current portion of long-term debt	5,971	2,964
Other current liabilities	1,128	1,615
Total current liabilities	67,135	66,485
Deferred revenue	17,050	17,413
Common stock warrant liability	13,667	11,387
Finance obligations	25,114	29,767
Long-term debt	17,873	20,829
Other liabilities	245	241
Total liabilities	141,084	146,122
Stockholders' equity:
Common stock, $0.01 par value per share; 450,000,000 shares authorized; Issued (including shares in treasury): 191,780,048 at March 31, 2017 and 191,723,974 at December 31, 2016	1,918	1,917
Additional paid-in capital	1,139,956	1,137,482
Accumulated other comprehensive income	467	247
Accumulated deficit	(1,078,541)	(1,051,467)
Less common stock in treasury: 582,328 at March 31, 2017 and December 31, 2016	(3,091)	(3,091)
Total stockholders' equity	60,709	85,088
Total liabilities, redeemable preferred stock, and stockholders' equity	210,724	240,832
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	$ 7,778	$ 8,469