Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 85,009	$ 146,205
Restricted cash	630
Accounts receivable	18,548	16,095
Inventory	31,512	24,736
Prepaid expenses and other current assets	7,917	5,710
Total current assets	143,616	192,746
Restricted cash	29,556	500
Property, plant, and equipment, net of accumulated depreciation of $27,603 and $26,539 respectively	7,888	5,312
Leased property under capital lease, net of accumulated depreciation of $1,550 and $1,162, respectively	1,549	1,937
Goodwill	399	447
Note receivable	8,310
Intangible assets, net	4,915	1,490
Other assets	8,385	1,719
Total assets	204,618	204,151
Current liabilities:
Accounts payable	18,176	10,185
Accrued expenses	6,917	8,750
Product warranty reserve	725	1,311
Deferred revenue	3,805	3,319
Obligations under capital lease		587
Other current liabilities	3,957	1,555
Total current liabilities	33,580	25,707
Deferred revenue	6,414	6,772
Common stock warrant liability	4,793	9,418
Finance obligations	9,650	2,426
Other liabilities	381	392
Total liabilities	54,818	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 September 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): 180,338,980 at September 30, 2015 and 173,644,532 at December 31, 2014	1,803	1,736
Additional paid-in capital	1,116,910	1,096,392
Accumulated other comprehensive income	1,245	898
Accumulated deficit	(968,649)	(938,081)
Less common stock in treasury: 378,116 at September 30, 2015 and at December 31, 2014	(2,662)	(2,662)
Total stockholders' equity	148,647	158,283
Total liabilities, redeemable preferred stock, and stockholders' equity	$ 204,618	$ 204,151