Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 21,491	$ 185,606
Marketable securities	61,176
Restricted cash	101	101
Accounts receivable, net	19,325	6,483
Inventory	12,321	3,717
Prepaid expenses and other current assets	4,619	5,487
Total current assets	119,033	201,394
Restricted cash	674	584
Property and equipment, net	19,614	21,915
Other assets	27	27
Intangible assets, net	7,066	7,355
Goodwill	3,605	3,605
Total assets	150,019	234,880
Current liabilities:
Accounts payable, accrued expenses and other	44,796	52,082
Deferred revenues	44,157	50,137
Deferred rent	1,935	1,527
Total current liabilities	90,888	103,746
Deferred revenues, net of current portion	39,900	51,197
Deferred rent, net of current portion	4,423	4,926
Deferred tax incentives, net of current portion	822	1,045
Long-term debt	215,544	257,655
Total liabilities	351,577	418,569
Commitments and contingencies
Non-controlling interest	(154)	239
Stockholders’ deficit:
Preferred stock, $0.01 par value: 10,000 shares authorized at June 30, 2016 and December 31, 2015; no shares issued or outstanding at June 30, 2016 or December 31, 2015
Common stock, $0.01 par value: 200,000 shares authorized at June 30, 2016 and December 31, 2015; 128,991 and 115,871 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively	1,290	1,159
Additional paid-in capital	688,760	617,145
Accumulated other comprehensive income	1
Accumulated deficit	(891,455)	(802,232)
Total stockholders’ deficit	(201,404)	(183,928)
Total liabilities, non-controlling interest and stockholders’ deficit	$ 150,019	$ 234,880